Air Conditioner. Outdoor Unit CU-3E19RBU CU-4E24RBU. Destination U.S.A. Canada

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1 Order No: PAPAMY0CE Air Conditioner Outdoor Unit CU-3E9RBU CU-4E24RBU Destination U.S.A. Canada Please file and use this manual together with the service manual for Model No. CS-E9RKUA CS-E2RKUA CS-E8RKUA, CS-E24RKUA, CS-ME7RKUA, CS-E2RB4U, CS-E8RB4U, CS-ME5RKUA, Order No. PAPAMY049CE, PAPAMY94CE, PAPAMY95CE, PAPAMY52CE. ARNING This service information is designed for experienced repair technicians only and is not designed for use by the general public. It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product. Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to service or repair the product or products dealt with in this service information by anyone else could result in serious injury or death. IMPORTANT SAFETY NOTICE There are special components used in this equipment which are important for safety. These parts are marked by! in the Schematic Diagrams, Circuit Board Diagrams, Exploded Views and Replacement Parts List. It is essential that these critical parts should be replaced with manufacturer s specified parts to prevent shock, fire or other hazards. Do not modify the original design without permission of manufacturer. PRECAUTION OF LO TEMPERATURE In order to avoid frostbite, be assured of no refrigerant leakage during the installation or repairing of refrigerant circuit. Panasonic Corporation 5

2 TABLE OF CONTENTS PAGE. Safety Precautions Specifications CU-3E9RBU CU-4E24RBU Dimensions CU-3E9RBU CU-4E24RBU Refrigeration Cycle Diagram CU-3E9RBU CU-4E24RBU Block Diagram CU-3E9RBU CU-4E24RBU iring Connection Diagram CU-3E9RBU CU-4E24RBU Electronic Circuit Diagram CU-3E9RBU CU-4E24RBU Printed Circuit Board Main Printed Circuit Board Noise Filter Printed Circuit Board Display Printed Circuit Board Installation Information CU-3E9RBU CU-4E24RBU Installation Instruction CU-3E9RBU CU-4E24RBU Operation Control Cooling Operation Heating Operation Simultaneous Operation Control Protection Control Freeze Prevention control (Cool) Dew Prevention control (Cool) Electronic Parts Temperature Rise Protection (Cool) Electronic Parts Temperature Rise Protection 2 (Cool) Cooling overload control (Cool) Heating overload control (Heat) Extreme Low Temperature Compressor low pressure protection control (Heat) Deice Control Time Delay Safety Control (Restart Control) seconds Force Operation Current Control PAGE 3.2 IPM (power transistor) Protection Control Compressor Protection Control (Gas leak detection control ) Compressor Protection Control (Gas leak detection control 2) Valve close detection control Compressor discharge high pressure protection control Servicing Mode CU-3E9RBU CU-4E24RBU Troubleshooting Guide Self Diagnosis Function Self-diagnosis Method Disassembly and Assembly Instructions Outdoor Unit Removal Procedure (CU-3E9RBU) Outdoor Unit Removal Procedure (CU-4E24RBU) Technical Data CU-3E9RBU CU-4E24RBU Exploded View and Replacement Parts List CU-3E9RBU CU-4E24RBU... 94

3 . Safety Precautions Read the following SAFETY PRECAUTIONS carefully before perform any servicing. Electrical work must be installed or serviced by a licensed electrician. Be sure to use the correct rating of the power plug and main circuit for the model installed. The caution items stated here must be followed because these important contents are related to safety. The meaning of each indication used is as below. Incorrect installation or servicing due to ignoring of the instruction will cause harm or damage, and the seriousness is classified by the following indications. ARNING CAUTION This indication shows the possibility of causing death or serious injury. This indication shows the possibility of causing injury or damage to properties. The items to be followed are classified by the symbols: This symbol denotes item that is PROHIBITED from doing. Carry out test run to confirm that no abnormality occurs after the servicing. Then, explain to user the operation, care and maintenance as stated in instructions. Please remind the customer to keep the operating instructions for future reference. ARNING. Do not modify the machine, part, material during repairing service. 2. If wiring unit is supplied as repairing part, do not repair or connect the wire even only partial wire break. Exchange the whole wiring unit. 3. Do not wrench the fasten terminal. Pull it out or insert it straightly. 4. Engage dealer or specialist for installation and servicing. If installation or servicing done by the user is defective, it will cause water leakage, electrical shock or fire. 5. Install according to this installation instructions strictly. If installation is defective, it will cause water leakage, electric shock or fire. 6. Use the attached accessories parts and specified parts for installation and servicing. Otherwise, it will cause the set to fall, water leakage, fire or electrical shock. 7. Install at a strong and firm location which is able to withstand the set s weight. If the strength is not enough or installation is not properly done, the set will drop and cause injury. 8. For electrical work, follow the local national wiring standard, regulation and the installation instruction. An independent circuit and single outlet must be used. If electrical circuit capacity is not enough or defect found in electrical work, it will cause electrical shock or fire. 9. This equipment is strongly recommended to install with Earth Leakage Circuit Breaker (ELCB) or Residual Current Device (RCD). Otherwise, it may cause electrical shock and fire in case equipment breakdown or insulation breakdown. 0. Do not use joint cable for indoor/outdoor connection cable. Use the specified indoor/outdoor connection cable, refer to Installation Instruction CONNECT THE CABLE TO THE INDOOR UNIT and connect tightly for indoor/outdoor connection. Clamp the cable so that no external force will be acted on the terminal. If connecting or fixing is not perfect, it will cause heat up or fire at the connection.. ire routing must be properly arranged so that control board cover is fixed properly. If control board cover is not fixed perfectly, it will cause heat-up or fire at the connection point of terminal, fire or electrical shock. 2. hen install or relocate air conditioner, do not let any substance other than the specified refrigerant, eg. air etc. mix into refrigeration cycle (piping). (Mixing of air etc. will cause abnormal high pressure in refrigeration cycle and result in explosion, injury etc.). 3. Do not install outdoor unit near handrail of veranda. hen installing air-conditioner unit at veranda of high rise building, child may climb up to outdoor unit and cross over the handrail and causing accident. 4. This equipment must be properly earthed. Earth line must not be connected to gas pipe, water pipe, earth of lightning rod and telephone. Otherwise, it may cause electric shock in case equipment breakdown or insulation breakdown. 5. Keep away from small children, the thin film may cling to nose and mouth and prevent breathing. 6. Do not use unspecified cord, modified cord, joint cord or extension cord for power supply cord. Do not share the single outlet with other electrical appliances. Poor contact, poor insulation or over current will cause electrical shock or fire. 7. Tighten the flare nut with torque wrench according to specified method. If the flare nut is over-tightened, after a long period, the flare may break and cause refrigerant gas leakage. 3

4 ARNING 8. For RA models, when connecting the piping, do not use any existing (R22) pipes and flare nuts. Using such same may cause abnormally high pressure in the refrigeration cycle (piping), and possibly result in explosion and injury. Use only RA materials. Thickness of copper pipes used with RA must be more than /32" (0.8mm). Never use copper pipes thinner than /32" (0.8mm). It is desirable that the amount of residual oil is less than oz/32.8 ft ( mg/0m). 9. During installation, install the refrigerant piping properly before run the compressor. (Operation of compressor without fixing refrigeration piping and valves at opened condition will cause suck-in of air, abnormal high pressure in refrigeration cycle and result in explosion, injury etc.).. During pump down operation, stop the compressor before remove the refrigeration piping. (Removal of refrigeration piping while compressor is operating and valves are opened condition will cause suck-in of air, abnormal high pressure in refrigeration cycle and result in explosion, injury etc.). 2. After completion of installation or service, confirm there is no leakage or refrigerant gas. It may generate toxic gas when the refrigerant contacts with fire. 22. Ventilate if there is refrigerant gas leakage during operation. It may cause toxic gas when refrigerant contacts with fire. 23. Do not insert your fingers or other objects into the unit, high speed rotating fan may cause injury. 24. Must not use other parts except original parts described in catalog and manual. 25. Using of refrigerant other than the specified type may cause product damage, burst and injury etc. CAUTION. Do not install the unit at place where leakage of flammable gas may occur. In case gas leaks and accumulates at surrounding of the unit, it may cause fire. 2. Carry out drainage piping as mentioned in installation instructions. If drainage is not perfect, water may enter the room and damage the furniture. 3. Tighten the flare nut with torque wrench according to specified method. If the flare nut is over-tightened, after a long period, the flare may break and cause refrigerant gas leakage. 4. Do not touch outdoor unit air inlet and aluminium fin. It may cause injury. 5. Select an installation location which is easy for maintenance. 6. Pb free solder has a higher melting point than standard solder; typically the melting point is F F ( C C) higher. Please use a high temperature solder iron. In case of the soldering iron with temperature control, please set it to 0 ± F (3 ± 0 C). Pb free solder will tend to splash when heated too high (about 00 F / 600 C). 7. supply connection to the room air conditioner. supply cord shall be UL listed or CSA approved 3 conductor with minimum AG2 wires. supply point should be in an easily accessible place for power disconnection in case of emergency. In some countries, permanent connection of this air conditioner to the power supply is prohibited. Fix power supply connection to a circuit breaker for permanent connection. Use NRTL approved fuse or circuit breaker (rating refers to name plate) for permanent connection. 8. Do not release refrigerant during piping work for installation, servicing, reinstallation and during repairing a refrigerant parts. Take care of the liquid refrigerant, it may cause frostbite. 9. Installation or servicing work: It may need two people to carry out the installation or servicing work. 0. Do not install this appliance in a laundry room or other location where water may drip from the ceiling, etc.. Do not sit or step on the unit, you may fall down accidentally. 2. Do not touch the sharp aluminum fins or edges of metal parts. If you are required to handle sharp parts during installation or servicing, please wear hand glove. Sharp parts may cause injury. 4

5 2. Specifications 2. CU-3E9RBU Indoor Unit Combination Source Cooling Operation Heating Operation Item Unit OUTDOOR UNIT Electrical Data Noise Electrical Data Noise.6k + 2.0k + 2.0k Phase, 8-2V, 60Hz ( supply from outdoor unit) k 5.58 (.8 ~ 7.3) BTU/h 9000 (600 ~ 2) Running Current A k.5 (0.36 ~ 2.42) EER / 3.68 (5.00 ~ 3.02) BTU/h 2.55 (6.95 ~ 0.25) Sound Pressure Level db-a (H/L) / - Sound Level db (H/L) 66 / - k 7.65 (.6 ~ 8.3) BTU/h (50 ~ 280) Running Current A k 2.06 (0.32 ~ 2.) COP / 3. (5.00 ~ 3.6) BTU/h 2.60 (7. ~ 2.35) Sound Pressure Level db-a (H/L) 52 / - Sound Level db (H/L) 68 / - Maximum Current A 5.0 Starting Current A 0. Circuit Breaker A Dimension Height mm (inch) 795 (3-5/6) idth mm (inch) (34-5/32) + (3-3/4) Depth mm (inch) 3 (2-5/8) Net eight kg (lb) 72 (59) Connection Cable 3 + (Earth) min AG6 Pipe Length Range ( room) m (ft) 3 ~ 25 (9.8 ~ 82.0) Maximum Pipe Length ( Room) m (ft) (64.0) Refrigerant Pipe Diameter Compressor Air Circulation Liquid Side mm (inch) 6.35 (/4) Gas Side mm (inch) 9.52 (3/8) Type Motor Type Hermetic Motor / Rotary Brushless (4-poles) Rated Output.k Type Motor Type Propeller Fan DC Motor (8-poles) Rated Output 60 Fan Speed High (Cooling / Heating) RPM 5 / 6 Heat Exchanger Air Volume Refrigerant Control Device Refrigerant Oil Type Tube Material Fin Material Plate fin configuration forced draft type Copper Aluminum (Blue Coated) Row / Stage 2 / 36 FPI 9 High (Cooling / Heating) m 3 /min (ft 3 /min) 4.0 (447) / 46.3 (634) Expansion Valve FVS 5

6 Item Unit OUTDOOR UNIT Refrigerant (RA) g (oz) 2.64k (93.2) Indoor Operation Range Outdoor Operation Range Cooling Heating Cooling Heating Dry Bulb et Bulb Maximum C ( F) 32 (89.6) 23 (73.4) Minimum C ( F) 6 (60.8) (5.8) Maximum C ( F) (86.0) Minimum C ( F) 6 (60.8) Maximum C ( F) 46 (4.8) 26 (78.8) Minimum C ( F) -0 (4.0) Maximum C ( F) 24 (75.2) 8 (64.4) Minimum C ( F) -5 (5.0) -6 (3.2) Multi Indoor RPM CS-ME5RKUA CS-ME7RKUA CS-E9RKUA CS-E2RKUA CS-E8RKUA Mode Fan Tap rpm COOL HEAT Airflow (m 3 /min) rpm Airflow (m 3 /min) rpm Airflow (m 3 /min) rpm Airflow (m 3 /min) rpm Airflow (m 3 /min) SHi Hi Me Lo Lo SSHi SHi Me Lo Lo Note Specifications are subject to change without notice for further improvement. 6

7 2.2 CU-4E24RBU Indoor Unit Combination Source Cooling Operation Heating Operation Item Unit OUTDOOR UNIT Electrical Data Noise Electrical Data Noise.6k +.6k + 2.0k + 2.0k Phase, 8-2V, 60Hz ( supply from outdoor unit) k 7.02 (3.0 ~ 9.2) BTU/h 200 (00 ~ 30) Running Current A k.9 (0.53 ~ 2.87) EER / 3.66 (5.66 ~ 3.2) BTU/h 2.55 (9.25 ~ 0.95) Sound Pressure Level db-a (H/L) 55 / - Sound Level db (H/L) 7 / - k. (4.2 ~ 4.2) BTU/h 370 ( ~ 480) Running Current A k 3.03 (0. ~ 4.38) COP / 3.66 (6.00 ~ 3.24) BTU/h 2.45 (.45 ~.05) Sound Pressure Level db-a (H/L) 55 / - Sound Level db (H/L) 7 / - Maximum Current A 2. Starting Current A 5.3 Circuit Breaker A 45 Dimension Height mm (inch) 999 (39-/32) idth mm (inch) 9 (37-/32) Depth mm (inch) 3 (3-3/32) Net eight kg (lb) 83 (83) Connection Cable 3 + (Earth) min AG6 Pipe Length Range ( room) m (ft) 3 ~ 25 (9.8 ~ 82.0) Maximum Pipe Length ( Room) m (ft) (229.6) Refrigerant Pipe Diameter Compressor Air Circulation Liquid Side mm (inch) 6.35 (/4) Gas Side mm (inch) 9.52 (3/8), (E24: 2. (/2)) Type Motor Type Hermetic Motor / Rotary Brushless (4-poles) Rated Output.k Type Motor Type Propeller Fan DC Motor (8-poles) Rated Output 90 Fan Speed High (Cooling / Heating) RPM 600 / 0 Heat Exchanger Air Volume Refrigerant Control Device Refrigerant Oil Type Tube Material Fin Material Plate fin configuration forced draft type Copper Aluminum (Blue Coated) Row / Stage 2 / 46 FPI 9 High (Cooling / Heating) m 3 /min (ft 3 /min) 55.6 (963) / 66.0 (23) Expansion Valve FVS Refrigerant (RA) g (oz) 3.k () 7

8 Item Unit OUTDOOR UNIT Indoor Operation Range Outdoor Operation Range Cooling Heating Cooling Heating Dry Bulb et Bulb Maximum C ( F) 32 (89.6) 23 (73.4) Minimum C ( F) 6 (60.8) (5.8) Maximum C ( F) (86.0) Minimum C ( F) 6 (60.8) Maximum C ( F) 46 (4.8) 26 (78.8) Minimum C ( F) -0 (4.0) Maximum C ( F) 24 (75.2) 8 (64.4) Minimum C ( F) -5 (5.0) -6 (3.2) Multi Indoor RPM Mode COOL HEAT Fan Tap CS-ME5RKUA CS-ME7RKUA CS-E9RKUA CS-E2RKUA CS-E8RKUA CS-E24RKUA rpm Airflow (m 3 /min) rpm Airflow (m 3 /min) rpm Airflow (m 3 /min) rpm Airflow (m 3 /min) rpm Airflow (m 3 /min) rpm Airflow (m 3 /min) SHi Hi Me Lo Lo SSHi SHi Me Lo Lo Note Specifications are subject to change without notice for further improvement. 8

9 Multi Split Combination Possibility: o A single outdoor unit enables air conditioning of up to three separate rooms for CU-3E9RBU. o A single outdoor unit enables air conditioning of up to four separate rooms for CU-4E24RBU. CONNECTABLE INDOOR UNIT ROOM Type.6k CS-ME5RKUA 2.0k CS-ME7RKUA 2.5k CS-E9RKUA all 3.2k CS-E2RKUA, CS-E2RB4U 5.0k CS-E8RKUA, CS-E8RB4U 7.0k CS-E24RKUA range of connectable indoor units -room maximum pipe length (m (ft)) Allowable elevation (m (ft)) Pipe length allowable pipe length (m (ft)) pipe length for maximum chargeless length (m (ft)) Additional gas amount over chargeless length (g/m (oz/ft)) OUTDOOR UNIT CU-4E24RBU A B C From 4.5k to 3.6k 25 (82.0) 5 (49.2) (229.6) 45 (47.6) (0.2) CU-3E9RBU A B C From 4.5k to 9.0k Note: 25 (82.0) 5 (49.2) (64.0) (98.4) (0.2) : Available Remarks for CU-4E24RBU. At least two indoor units must be connected. 2. The total nominal cooling capacity of indoor units that will be connected to outdoor unit must be within connectable capacity range of indoor unit. (as shown in the table above) Example: The indoor units combination below is possible to connect to CU-4E24RBU. ( nominal capacity of indoor units is between 4.5k to 3.6k) ) Two CS-E9RKUA only ( nominal cooling capacity is 5.0k) 2) Three CS-E2RKUA. ( nominal cooling capacity is 9.6k) D 9

10 Indoor Unit : CS-ME5RKUA, CS-ME7RKUA, CS-E9RKUA, CS-E2RKUA, CS-E8RKUA, CS-E2RB4U, CS-E8RB4U Outdoor Unit : CU-3E9RBU 0

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12 Indoor Unit : CS-ME5RKUA, CS-ME7RKUA, CS-E9RKUA, CS-E2RKUA, CS-E8RKUA, CS-E24RKUA, CS-E2RB4U, CS-E8RB4U Outdoor Unit : CU-4E24RBU 2

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16 3. Dimensions 3. CU-3E9RBU Space necessary for installation 3-5/6 (0 cm) -5/64 (27.5) <Top View> (5-5/32 (3)) 24-9/64 (63) 5-5/32 (3) 3-3/4 (95) -/2 (38) 3-5/6 (0 cm) 39-3/8 (00 cm) Anchor Bolt Pitch 4-3/6 (360.5) x 24-9/64 (63) 3-7/64 (83) 5-7/32 (32.5) -39/64 (4) 4-3/6 (360.5) <Side View> <Front View> <Side View> 2-2/ /32 (875) (59) 2-5/8 (3) 3-3/8 X /8 = 0-/8 (85.7 x 3 = 257.) 5/6 (23.8) 2-3/64 (52) -2/32 (42) 63/64 (25) 3-9/32 (9.2) 43/64 (7) (3-3/6 (8)) (6-37/64 (67)) 3-3/8 X /8 = 0-/8 (85.7 x 3 = 257.) (8-7/64 (20)) 3-5/6 (795) Unit: inch (mm) 3.2 CU-4E24RBU Space necessary for installation 3-5/6 (0 cm) <Top View> 24-3/32 (6) 6-/6 () -7/6 (36.2) 3-5/6 (0 cm) 39-3/8 (00 cm) Anchor Bolt Pitch 24-3/32 (6) x 4-3/32 (3.5) 4-3/32 (3.5) <Side View> <Front View> 37-/32 (9) -3/32 (36) <Side View> 3-3/32 (3) 39-/32 (999) 3/64 (5.5) 4-/8 x 5/32 = 6-7/32 (05 x 4 = 4) 4-/8 x 5/32 = 6-7/32 (05 x 4 = 4) 2-2/32 (67.7) 5-3/32 (29.5) Unit: inch (mm) -/6 (27) 2-5/6 (74.5) 6

17 4. Refrigeration Cycle Diagram 4. CU-3E9RBU INDOOR A OUTDOOR LIQUID SIDE PIPE TEMP. SENSOR STRAINER EXPANSION VALVE A 3-AY VALVE INTAKE TEMP. SENSOR HEAT EXCHANGER (EVAPORATOR) PIPE TEMP. SENSOR LIQUID SIDE 3-AY VALVE GAS SIDE 3-AY VALVE LIQUID SIDE 3-AY VALVE PIPE TEMP. SENSOR STRAINER PIPE TEMP. SENSOR STRAINER EXPANSION VALVE B EXPANSION VALVE C 3-AY VALVE STRAINER INTAKE TEMP. SENSOR PIPE TEMP. SENSOR PIPE TEMP. SENSOR (DEF) INTAKE TEMP. SENSOR CONDENSOR TEMP. SENSOR HEAT EXCHANGER (EVAPORATOR) GAS SIDE 3-AY VALVE HEAT EXCHANGER (CONDENSOR) INDOOR B PIPE TEMP. SENSOR INTAKE TEMP. SENSOR HEAT EXCHANGER (EVAPORATOR) PIPE TEMP. SENSOR GAS SIDE 3-AY VALVE PIPE TEMP. SENSOR PIPE TEMP. SENSOR 3-AY VALVE 4-AY VALVE INDOOR C COMPRESSOR TEMP. SENSOR PRESSURE SITCH ACCUMULATOR DISCHARGE MUFFLER COMPRESSOR COOLING HEATING 7

18 4.2 CU-4E24RBU INDOOR A OUTDOOR LIQUID SIDE PIPE TEMP. SENSOR STRAINER EXPANSION VALVE A 3-AY VALVE INTAKE TEMP. SENSOR HEAT EXCHANGER (EVAPORATOR) INTAKE TEMP. SENSOR PIPE TEMP. SENSOR PIPE TEMP. SENSOR LIQUID SIDE 3-AY VALVE GAS SIDE 3-AY VALVE LIQUID SIDE 3-AY VALVE LIQUID SIDE 3-AY VALVE PIPE TEMP. SENSOR STRAINER PIPE TEMP. SENSOR PIPE TEMP. SENSOR STRAINER STRAINER EXPANSION VALVE B EXPANSION VALVE C EXPANSION VALVE D 3-AY VALVE STRAINER PIPE TEMP. SENSOR (DEF) INTAKE TEMP. SENSOR CONDENSOR TEMP. SENSOR HEAT EXCHANGER (EVAPORATOR) GAS SIDE 3-AY VALVE HEAT EXCHANGER (CONDENSOR) INDOOR B PIPE TEMP. SENSOR INTAKE TEMP. SENSOR HEAT EXCHANGER (EVAPORATOR) INDOOR C PIPE TEMP. SENSOR GAS SIDE 3-AY VALVE PIPE TEMP. SENSOR PIPE TEMP. SENSOR PIPE TEMP. SENSOR 3-AY VALVE 4-AY VALVE INTAKE TEMP. SENSOR PIPE TEMP. SENSOR COMPRESSOR TEMP. SENSOR PRESSURE SITCH ACCUMULATOR HEAT EXCHANGER (EVAPORATOR) INDOOR D GAS SIDE 3-AY VALVE DISCHARGE MUFFLER COMPRESSOR COOLING HEATING 8

19 5. Block Diagram 5. CU-3E9RBU SINGLE PHASE POER SUPPLY TO INDOOR UNIT A TO INDOOR UNIT B L L (OUTDOOR UNIT) FUSE RY-PR RY-AC FUSE 2 PTC NTC HEATER 4-AY VALVE RY-HT RY-HOT FUSE M MS 3~ RECTIFICATION CIRCUIT RECTIFICATION CIRCUIT CAPACITOR CIRCUIT PFC CIRCUIT SC REACTOR NTC NOISE FILTER CIRCUIT NTC TO INDOOR UNIT C 2 3 9

20 5.2 CU-4E24RBU SINGLE PHASE POER SUPPLY AC 8/2V 60Hz TO INDOOR UNIT A TO INDOOR UNIT B L L (OUTDOOR UNIT) FUSE RY-PR RY-AC FUSE 2 PTC NTC HEATER 4-AY VALVE RY-HT RY-HOT FUSE M MS 3~ RECTIFICATION CIRCUIT RECTIFICATION CIRCUIT CAPACITOR CIRCUIT PFC CIRCUIT SC REACTOR NTC NOISE FILTER CIRCUIT NTC TO INDOOR UNIT C TO INDOOR UNIT D

21 6. iring Connection Diagram 6. CU-3E9RBU BLK Q0 P 2 3 BLK N 2 3 Y/G BLK Y/G R Resistance of Compressor indings CONNECTION 5KD84XAB2 (Ω) ACN (HITE) ACL (BLACK) U-V 4 CN-FM (HITE) 7 2 U- CN-PS (BLUE) CN-TH3 (HITE) 0 V- FUSE (A 2V) FUSE (T3.5A L2V) CN-TH4 (HITE) FG (GREEN) FG2 (GREEN) CN-BLK (BLACK) RECTIFICATION CIRCUIT (HITE) CN-TH 4 CN-COM (HITE) ELECTRONIC CONTROLLER (NOISE FILTER) AC-HT (HITE) 4 4 PFC CIRCUIT ELECTRONIC CONTROLLER (DISPLAY) RECTIFICATION CIRCUIT SITCHING POER SUPPLY CIRCUIT ELECTRONIC CONTROLLER (MAIN) U V (RED) (BLUE) (YELLO) U V CONNECTOR HITE R B Y 3 3 R B Y COMPRESSOR R BLK B Y M FAN MOTOR R (YELLO) CN-TH2 4 R (HITE) CN-DIS HIGH PRESSURE S. LIQUID PIPE TEMP. SENSOR (UNIT A) (THERMISTOR) LIQUID PIPE TEMP. SENSOR (UNIT B) (THERMISTOR) LIQUID PIPE TEMP. SENSOR (UNIT C) (THERMISTOR) GAS PIPE TEMP. SENSOR (UNIT A) (THERMISTOR) GAS PIPE TEMP. SENSOR (UNIT B) (THERMISTOR) GAS PIPE TEMP. SENSOR (UNIT C) (THERMISTOR) OUTDOOR TEMP. SENSOR (THERMISTOR) 2 HEAT EXCHANGER TEMP. SENSOR (THERMISTOR) DEFROST TEMP. SENSOR (THERMISTOR) t t t t t t t t t t G G NOISE FILTER CIRCUIT CN-HT (HITE) BLK AC-BLK (BLACK) GRY L-I (GRY) GRY L2-I (GRY) GRY BLK GRY BLK BLK L-O (BLK) REACTOR REACTOR CONNECTOR HITE BLK L2-O (BLK) YELLO (YEL) OR T () BLUE (BLU) OR S (V) (TRADEMARK) RED (RED) OR R (U) COMP. TERMINAL THE PARENTHESIZED LETTERS IS INDICATED ON TERMINAL COVER MS 3~ FUSE 2 (T2.5A L2V) DISCHARGE TEMP. SENSOR (THERMISTOR) CN-DATA (HITE) CN-DATA (HITE) COMMUNICATION CIRCUIT 9 9 CONTROL BOARD CABINET SIDE PLATE JP COOL ONLY 7 CN-DISP (HITE) CN-DISP (HITE) POER SAVE 8 CN-DISP2 (HITE) PRIORITY MODE PUMP DON OPERATION TEST 6 CN-NMODE (HITE) CN-NMODE (YELLO) L SINGLE PHASE POER SUPPLY AC 8/2V 60Hz L2 TERMINAL BOARD TERMINAL BOARD REMARKS BLU/B : BLUE BLK : BLACK : HITE R/RED : RED Y/YEL : YELLO GRY : GRAY G : GREEN ORG : ORANGE Y/G : YELLO/GREEN BR : BRON B Y IRING CHECK 4 7 CN-HOT (BLUE) RY-HOT ELECTRO MAGNETIC COIL (4-AY VALVE) 3 RY-HT HEATER 3 (HITE) CN-EV (YELLO) CN-EV (BLUE) CN-EV3 M M M CN-HT (BLACK) UNIT A ELECTRO-MAGNETIC COIL (EXPANSION VALVE) UNIT B ELECTRO-MAGNETIC COIL (EXPANSION VALVE) UNIT C ELECTRO-MAGNETIC COIL (EXPANSION VALVE) TO INDOOR UNIT A 2 3 BLK TO INDOOR UNIT C TO INDOOR UNIT B 2

22 6.2 CU-4E24RBU Resistance of Compressor indings 5KD2XAL2 (Ω) CONNECTION 0.72 U-V 0.73 U- 0.7 V- Y/G REACTOR GRY R BLK CONTROL BOARD AC (BRON) DCN (BLACK) DCP (RED) RAT (GRAY) G G CONTROL BOARD AC-HT (HITE) CN-HT (HITE) DCN (BLACK) DCP (RED) FG2 (GREEN) FG (GREEN) ACN (HITE) Q0 P BLK AC-BLK (BLACK) CN-BLK (BLACK) ACL (BLACK) N TERMINAL BOARD BLK TERMINAL BOARD 2 3 BLK U (RED) U V (BLUE) V (YELLO) R B BR ORG R B Y 3 3 SMOOTHING CAPACITOR COMPRESSOR RY-PR FUSE (A 2V) FUSE (T3.5A L2V) AC2 (BLUE) BLK GRY BR NOISE FILTER CIRCUIT R RAT2 (GRAY) AC (BRON) AC2 (BLUE) R PFC CAPACITOR R CN-FM (HITE) CN-COM (HITE) 4 7 PFC CIRCUIT ELECTRONIC CONTROLLER (NOISE FILTER) 2 CN-PS (BLUE) CN-TH3 (HITE) ELECTRONIC CONTROLLER (DISPLAY) 0 RECTIFICATION CIRCUIT CN-TH4 (HITE) SITCHING POER SUPPLY CIRCUIT ELECTRONIC CONTROLLER (MAIN) (HITE) CN-TH 4 CONNECTOR HITE M FAN MOTOR R B Y MS 3~ HIGH PRESSURE S. LIQUID PIPE TEMP. SENSOR (UNIT A) (THERMISTOR) LIQUID PIPE TEMP. SENSOR (UNIT B) (THERMISTOR) LIQUID PIPE TEMP. SENSOR (UNIT C) (THERMISTOR) LIQUID PIPE TEMP. SENSOR (UNIT D) (THERMISTOR) GAS PIPE TEMP. SENSOR (UNIT A) (THERMISTOR) GAS PIPE TEMP. SENSOR (UNIT B) (THERMISTOR) GAS PIPE TEMP. SENSOR (UNIT C) (THERMISTOR) GAS PIPE TEMP. SENSOR (UNIT D) (THERMISTOR) OUTDOOR TEMP. SENSOR (THERMISTOR) HEAT EXCHANGER TEMP. SENSOR (THERMISTOR) DEFROST TEMP. SENSOR (THERMISTOR) t t t t t t t t t t t CN-DATA (HITE) B RECTIFICATION CIRCUIT COMMUNICATION CIRCUIT B Y CN-DATA (HITE) ORG FUSE 2 (T3.5A L2V) CN-DISP (HITE) CN-DISP (HITE) JP COOL ONLY POER SAVE 8 CN-DISP2 (HITE) PRIORITY MODE PUMP DON 4 OPERATION TEST 6 CN-NMODE (YELLO) CN-NMODE (HITE) IRING CHECK 7 7 RY-HOT CN-HOT (BLUE) ELECTRO MAGNETIC COIL (4-AY VALVE) (YELLO) CN-TH (HITE) CN-DIS 2 CN-EV3 7 (RED) CN-EV4 (YELLO) (BLUE) CN-EV (HITE) CN-EV t YELLO (YEL) OR T () DISCHARGE TEMP. SENSOR (THERMISTOR) M M M REMARKS BLU/B : BLUE BLK : BLACK : HITE R/RED : RED Y/YEL : YELLO GRY : GRAY G : GREEN ORG : ORANGE Y/G : YELLO/GREEN BR : BRON M RED (RED) OR R (U) BLUE (BLU) OR S (V) UNIT D ELECTRO- MAGNETIC COIL (EXPANSION VALVE) UNIT C ELECTRO- MAGNETIC COIL (EXPANSION VALVE) UNIT B ELECTRO- MAGNETIC COIL (EXPANSION VALVE) UNIT A ELECTRO- MAGNETIC COIL (EXPANSION VALVE) (TRADEMARK) COMP. TERMINAL THE PARENTHESIZED LETTERS IS INDICATED ON TERMINAL COVER RY-HT HEATER CN-HT (BLACK) SINGLE PHASE POER SUPPLY AC 8/2V 60Hz L L2 TO INDOOR UNIT A 2 3 BLK TO INDOOR UNIT B 2 3 BLK TO INDOOR UNIT D TO INDOOR UNIT C

23 + 7. Electronic Circuit Diagram 7. CU-3E9RBU GRY REACTOR BLK GRY REACTOR BLK CONNECTOR HITE 4 4 BLK BLK GRY 2 3 BLK BLK Y/G BLK Y/G R ACN (HITE) ACL (BLACK) CN-COM (HITE) FUSE (A 2V) FG (GREEN) ELECTRONIC CONTROLLER (NOISE FILTER) ELECTRONIC CONTROLLER (DISPLAY) CN-DISP 5V (HITE) FG2 (GREEN) Q0 P N U V GRY CN-FM (HITE) R 4 7 BLK L2-O (BLK) CN-PS (BLUE) B Y 2 CN-TH3 (HITE) 0 CN-TH4 (HITE) L-O (BLK) L2-I (GRY) L-I (GRY) AC-HT (HITE) CN-HT (HITE) RECTIFICATION CIRCUIT AC-BLK (BLACK) CN-BLK (BLACK) (HITE) CN-TH 4 (YELLO) CN-TH2 4 (RED) (BLUE) (YELLO) U V CONNECTOR HITE R B Y 3 3 R B Y MS 3~ COMPRESSOR BLK M FAN MOTOR R R FUSE (T3.5A L2V) HIGH PRESSURE S. LIQUID PIPE TEMP. SENSOR (UNIT A) (THERMISTOR) LIQUID PIPE TEMP. SENSOR (UNIT B) (THERMISTOR) LIQUID PIPE TEMP. SENSOR (UNIT C) (THERMISTOR) (5K, 3900) GAS PIPE TEMP. SENSOR (UNIT A) (THERMISTOR) GAS PIPE TEMP. SENSOR (UNIT B) (THERMISTOR) GAS PIPE TEMP. SENSOR (UNIT C) (THERMISTOR) (5K, 3900) OUTDOOR TEMP. SENSOR (THERMISTOR) (5K, 39) HEAT EXCHANGER TEMP. SENSOR (THERMISTOR) (5K, 3900) DEFROST TEMP. SENSOR (THERMISTOR) (5K, 3900) PFC CIRCUIT 5V CN-DATA (HITE) CN-DATA (HITE) 5V t t t t t t t 3V t t 5V 3V 9 9 FUSE 2 (T2.5A L2V) ELECTRONIC CONTROLLER (MAIN) RECTIFICATION CIRCUIT SITCHING POER SUPPLY CIRCUIT RY-HOT CN-HOT (BLUE) 3 ELECTRO MAGNETIC COIL (4-AY VALVE) RY-HT 3 HEATER CN-HT (BLACK) (HITE) CN-DIS (BLUE) CN-EV3 2 (YELLO) CN-EV2 6 (HITE) 8 CN-EV 6 t DISCHARGE TEMP. SENSOR (THERMISTOR) (K, 39) SINGLE PHASE POER SUPPLY AC 8/2V 60Hz TERMINAL BOARD TERMINAL BOARD L L2 CONTROL BOARD CABINETSIDEPLATE G G NOISE FILTER CIRCUIT M COMMUNICATION CIRCUIT M 7 M UNIT C ELECTRO-MAGNETIC COIL (EXPANSION VALVE) UNIT B ELECTRO-MAGNETIC COIL (EXPANSION VALVE) UNIT A ELECTRO-MAGNETIC COIL (EXPANSION VALVE) 8 6 CN-NMODE (HITE) CN-NMODE (YELLO) CN-DISP2 (HITE) CN-DISP (HITE) TO INDOOR UNIT A B Y TO INDOOR UNIT B 2 3 BLK TO INDOOR UNIT C V 5V 5V PUMP DON S OPERATION TEST S2 IRING CHECK S3 S4 POER SAVE ON OFF 3 2 S5 PRIORITY MODE ON OFF *JP GREEN LED GREEN LED2 GREEN LED3 GREEN LED4 GREEN LED5 GREEN LED6 3 2 COOL ONLY 4 7 Compressor Temp. Sensor (Thermistor) Charateristics 60 0 Temperature C ( F) 5V 3V 5V 5V e 5V 5V_2 5V 5V 3V 3V 5V c b b e c e c c e b b b e c e c b c e b Resistance (K) Resistance (K) -0 () Sensor (Thermistor) Characteristics 0 (32) 0 () Outdoor Air Sensor Outdoor Heat Exchanger Sensor (68) Temperature C ( F) (86) (04) (22) (68) (04) 60 () (76) 00 (22) (248) (284) 23

24 7.2 CU-4E24RBU CONTROL BOARD G BLK Y/G G REACTOR GRY CONTROL BOARD TERMINAL BOARD BLK TERMINAL BOARD R BLK BLK CN-FM (HITE) BR ORG M AC (BRON) FAN MOTOR HIGH PRESSURE S. LIQUID PIPE TEMP. SENSOR (UNIT A) (THERMISTOR) LIQUID PIPE TEMP. SENSOR (UNIT B) (THERMISTOR) LIQUID PIPE TEMP. SENSOR (UNIT C) (THERMISTOR) LIQUID PIPE TEMP. SENSOR (UNIT D) (THERMISTOR) (5k, 3900) DCN (BLACK) GAS PIPE TEMP. SENSOR (UNIT A) (THERMISTOR) GAS PIPE TEMP. SENSOR (UNIT B) (THERMISTOR) GAS PIPE TEMP. SENSOR (UNIT C) (THERMISTOR) GAS PIPE TEMP. SENSOR (UNIT D) (THERMISTOR) (5k, 3900) OUTDOOR TEMP. SENSOR (THERMISTOR) (5k, 39) HEAT EXCHANGER TEMP. SENSOR (THERMISTOR) (5k, 3900) DEFROST TEMP. SENSOR (THERMISTOR) (5k, 3900) DCP (RED) RAT (GRAY) AC-HT (HITE) (HITE) CN-DIS 2 3 B CN-HT (HITE) DCN (BLACK) DCP (RED) Y 3 FG2 (GREEN) FG (GREEN) ACN (HITE) CONNECTOR HITE R 3 3 R 5 7 Q0 CN-BLK (BLACK) ACL (BLACK) MS 3~ U (RED) U (BLUE) V (YELLO) AC-BLK (BLACK) SMOOTHING CAPACITOR RY-PR FUSE (A 2V) COMPRESSOR N FUSE (T3.5A L2V) AC2 (BLUE) 9 BLK GRY BR NOISE FILTER CIRCUIT ELECTRONIC CONTROLLER (NOISE FILTER) CN-COM (HITE) 7 PFC CAPACITOR RAT2 (GRAY) AC (BRON) AC2 (BLUE) R463 5V 3 3 RECTIFICATION CIRCUIT R44 R43 R 8 D3 R PC CN-DATA (HITE) CN-DATA (HITE) PFC CIRCUIT 6 COMMUNICATION CIRCUIT ZD3 ZD R2 9 9 R4 C43 5V ZD2 ORG 5V 5V D ZD4 R327 R8 R9 R 5V 3V 7 3V B PC2 5V_2 Q 0k Q32 4.7k 0k R4 5V 5V R6 R7 R3 R42 R5 D2 Q 5V C44 R86 R45 R k Q3 4.7k R46 R47 R326 R33 R329 PC4 D4 ZD7 0k C228 R3 C229 R332 P 7 V B Y R328 C23 B Y R424 5V 2 4 C45 C2 7 2 C227 R43 R435 ZD6 4 4 R R R t t 5V 5V R423 R42 t PC5 B R49 5V t ZD8 PC3 R438 R38 t t R426 t Q34 t t t t FUSE 2 (T3.5A L2V) R48 ZD9 R422 Q2 R425 5V 5V R429 R4 R427 0k R39 PC6 3V 4.7k R437 C65 R R433 R434 R432 CN-PS (BLUE) RECTIFICATION CIRCUIT R436 D5 R32 R428 Q3 CN-TH3 (HITE) SITCHING POER SUPPLY CIRCUIT 0 CN-TH4 (HITE) CN-DISP (HITE) CN-DISP (HITE) ELECTRONIC CONTROLLER (DISPLAY) ELECTRONIC CONTROLLER (MAIN) (HITE) CN-TH 4 CN-DISP2 (HITE) CN-NMODE (YELLO) (YELLO) CN-TH2 CN-NMODE (HITE) RY-HOT CN-HOT (BLUE) ELECTRO MAGNETIC COIL (4-AY VALVE) RY-HT HEATER CN-HT (BLACK) 8 6 t DISCHARGE TEMP. SENSOR (THERMISTOR) (k, 39) (RED) CN-EV4 SINGLE PHASE POER SUPPLY AC 8/2V 60Hz (BLUE) CN-EV3 (YELLO) CN-EV2 (HITE) CN-EV M M M M UNIT D ELECTRO- MAGNETIC COIL (EXPANSION VALVE) UNIT C ELECTRO- MAGNETIC COIL (EXPANSION VALVE) L L2 UNIT B ELECTRO- MAGNETIC COIL (EXPANSION VALVE) UNIT A ELECTRO- MAGNETIC COIL (EXPANSION VALVE) TO INDOOR UNIT A BLK TO INDOOR UNIT C TO INDOOR UNIT B BLK R C46 Q24 4.7k 5V R445 R4 R446 R4 RY-PR D6 D78 0k PC8 5V ZD C R439 R459 R455 ZD4 PC 5V 5V R444 R b b b c e c ZD42 e R449 R452 c e 2 2 PC7 2 C48 R443 ZD43 R448 R44 R447 Q4 5V 5V R460 R R454 PC9 R457 5V R453 R456 R458 C232 C24 C233 C234 C236 R333 R338 R334 R335 R337 R46 D7 R462 Q5 5V V 5V 2 4 Sensor (Thermistor) Characteristics Compressor Temp. Sensor (Thermistor) Charateristics 3 b b c PUMP DON S Outdoor Air Sensor Outdoor Heat Exchanger Sensor e c e e c b e V c e c b OPERATION TEST S2 C239 C2 C235 C237 C238 R34 R342 R336 R339 R3 b b c e b e c IRING CHECK S3 5V S4 POER SAVE ON OFF e c b b e c c e b c b 3 2 S5 PRIORITY MODE b e c Resistance (K) 5V ON OFF 3 2 5V 0 0 R00 R0 COOL ONLY JP R4 GREEN LED (04) (22) (86) (68) 0 () 0 (32) -0 () C45 C46 R5 5V R6 R7 R03 0 (284) (248) 00 (22) R8 C48 R9 GREEN LED2 GREEN LED3 GREEN LED4 GREEN LED5 GREEN LED6 R368 R367 3V R366 (76) 60 () Temperature C ( F) Temperature C ( F) 3V R365 C47 e Q27 Q29 Q26 Q25 5V R02 C28 D34 C29 D35 C2 D36 D33 C62 TO INDOOR UNIT D D72 C9 D69 DD7 D66 D67D68 D65 D62 D63D64 D6 D60 D59 D58 D57 Resistance (K) (04) (68) 24

25 8. Printed Circuit Board 8. Main Printed Circuit Board 8.. CU-3E9RBU POER TRANSISTOR (IPM) CN-DISP2 CURRENT TRANSFORMER (CT) CN-NMODE CN-EV CN-TH CN-EV2 CN-DIS CN-TH3 CN-EV3 CN-TH2 CN-TH4 CN-DISP CN-PS CN-FM 25

26 8..2 CU-4E24RBU POER TRANSISTOR (IPM) CN-DISP2 CURRENT TRANSFORMER (CT) CN-NMODE CN-DISP CN-EV CN-TH CN-EV2 CN-DIS CN-TH3 CN-EV3 CN-TH2 CN-EV4 CN-EV5 CN-TH4 CN-PS CN-FM 26

27 8.2 Noise Filter Printed Circuit Board 8.2. CU-3E9RBU CN-COM CN-DATA CN-HT CN-BLK CU-4E24RBU CN-COM CN-DATA CN-HT CN-BLK 27

28 8.3 Display Printed Circuit Board 8.3. CU-3E9RBU CN-DISP CN-NMODE CN-NMODE2 LED LED2 LED3 LED4 LED5 S S4 S2 S5 S3 LED CU-4E24RBU CN-NMODE CN-DISP 28

29 9. Installation Information 9. CU-3E9RBU 9.. Check Points Indoor/outdoor unit connection cables (Not included in the unit) Outdoor unit power supply: Single-phase 8-2V, 60Hz Unit C Flexible cord x 4 core (polychloroprene sheathed) A switch (circuit breaker) (Not included in the unit) Flexible cord x 3 core (Not included in the unit) Outside wiring work (Not included in the unit) Unit B Flexible cord x 4 core (polychloroprene sheathed) (Not included in the unit) Unit A Applicable connecting tube kit: CZ-3F type Unit A Maximum pipe length: 25 m (82.0 ft) Unit B Maximum pipe length: 25 m (82.0 ft) Unit C Maximum pipe length: 25 m (82.0 ft) Allowable elevation: 5 m (49.2 ft) max. The allowable elevation between each of the indoor units and between the indoor and outdoor units. maximum pipe length: m (64.0 ft) Grounding work Air purging: Air purging by vacuum pump. 29

30 9.2 CU-4E24RBU 9.2. Check Points Indoor/outdoor unit connection cables (Not included in the unit) Unit D Flexible cord x 4 core (polychloroprene sheathed) (Not included in the unit) Outdoor unit power supply: Single-phase 8-2V, 60Hz Unit C Flexible cord x 4 core (polychloroprene sheathed) 45A switch (circuit breaker) (Not included in the unit) Flexible cord x 3 core (Not included in the unit) (Not included in the unit) Unit B Flexible cord x 4 core (polychloroprene sheathed) (Not included in the unit) Unit A Allowable elevation: 5 m (49.2 ft) max. The allowable elevation between each of the indoor units and between the indoor and outdoor units. Outside wiring work Applicable connecting tube kit: CZ-3F type Unit A Maximum pipe length: 25 m (82.0 ft) Unit B Maximum pipe length: 25 m (82.0 ft) Unit C Maximum pipe length: 25 m (82.0 ft) Unit D Maximum pipe length: 25 m (82.0 ft) maximum pipe length: m (229.6 ft) Grounding work Air purging: Air purging by vacuum pump.

31 0. Installation Instruction 0. CU-3E9RBU 0.. Select The Best Location If an awning is built over the unit to prevent direct sunlight or rain, be careful that heat radiation from the condenser is not obstructed. There should not be any animal or plant which could be affected by hot air discharged. Keep the spaces indicated by arrows from wall, ceiling, fence or other obstacles. Do not place any obstacles which may cause a short circuit of the discharged air. Recommended installation height for outdoor unit should be above the seasonal snow level Outdoor Unit Installation Diagram Installation parts you should purchase () It is advisable to avoid more than 2 blockage directions. For better ventilation & multiple-outdoor installation, please consult authorized dealer/specialist. Outdoor Unit Liquid - side Gas - side Refrigerant piping size CU-3E9** ø/4" (ø6.35 mm) thickness /32" (t0.8 mm) ø3/8" (ø9.52 mm) thickness /32" (t0.8 mm) supply cord () (Conduit) Connection cable () (Conduit) Outdoor Unit CU-3E9** Min. total piping length for additional gas 98.4 ft ( m) If total piping length of all indoor units exceeds the minimum length listed above, additionally charge with 0.2 oz (g) of refrigerant (RA) for each additional feet (meter) of piping. Additional drain hose () /4" (6.35 mm) Liquidsidepiping() 3/8" (9.52mm) Gas side piping () This illustration is for explanation purposes only. * Note: Respective indoor unit installation procedure shall refer to instruction manual provided in the indoor unit packaging. Allowable piping length Outdoor Unit CU-3E9*** Allowable piping length of each indoor unit (min. ~ max.) 9.8 ft ~ 82.0 ft (3 m ~ 25 m) Allowable total piping length of all indoor unit 64.0 ft ( m) or less Outdoor unit located on upper side g 49.2 ft (5 m) or less Height difference between indoor and outdoor unit Outdoor unit located otherwise h 24.6 ft (7.5 m) or less Outdoor unit located otherwise k 49.2 ft (5 m) or less Height difference between indoor unit Outdoor unit located on upper side i 24.6 ft (7.5 m) or less Outdoor unit located otherwise j 49.2 ft (5 m) or less Outdoor unit located on upper side Outdoor unit located otherwise Indoor unit Outdoor unit g i j h Outdoor unit k j Indoor unit Indoor unit Outdoor unit 3

32 Outdoor Unit Installation Guidelines here a wall or other obstacle is in the path of outdoor unit s intake or exhaust airflow, follow the installation guidelines below. For any of the below installation patterns, the wall height on the exhaust side should be 47-/4" (0 mm) or less. all facing one side alls facing two side alls facing three side More than 3 5/6" (00) More than 39 3/8" (000) More than 3 5/6" (00) More than 39 3/8" (000) More than 3 5/6" (00) 47 /4" (0) or less More than 3 5/6" (00) Side view More than 3 5/6" (00) Top view More than 3/6" (0) More than 39 3/8" (000) Top view Unit : inch (mm) 0..2 Install The Outdoor Unit After selecting the best location, start installation to Indoor/Outdoor Unit Installation Diagram.. Fix the unit on concrete or rigid frame firmly and horizontally by bolt nut (ø3/32" (ø0 mm)). 2. hen installing on a roof, please consider strong winds and earthquakes. 3. Please fasten the installation stand firmly with bolt or nails. Model A B C D CU-3E9*** A 24-/8" (63 mm) B 5-5/32" (3 mm) C D 5/8" (6 mm) 4-3/6" (360.5 mm) 0..3 Connect The Piping Remove the control board cover (resin) from the outdoor unit by loosening three screws. Connecting The Piping To Outdoor Unit Decide piping length and then cut by using pipe cutter. Remove burrs from cut edge. Make flare after inserting the flare nut (locate at valve) onto the copper pipe. Align center of piping to valves and then tighten with torque wrench to the specified torque as stated in the table. Do not over tighten, over tightening may cause gas leakage Piping size Torque /4" [6.35 mm] 3.3 Ibf ft [8 N m (.8 kgf m)] 3/8" [9.52 mm] 3.0 Ibf ft [42 N m (4.3 kgf m)] /2" [2.7 mm].6 Ibf ft [55 N m (5.6 kgf m)] 5/8" [5.88 mm] 47.9 Ibf ft [65 N m (6.6 kgf m)] 3/4" [9.05 mm] 73.8 Ibf ft [00 N m (0.2 kgf m)] Gas Leak Checking Pressure test to system to 0 PSIG with dry nitrogen, in stages. Thoroughly leak check the system. If the pressure holds, release the nitrogen and proceed to section Screws Control Board Cover (Resin) Flare Nut (Connection Pipe) Female side Liquid side Torque rench for Flare Nut Applicable to Liquid and Gas side of CS-ME5*** CS-E2*** CS-ME7*** CS-E8*** CS-E9*** Flare Nut Gas side (Connection Pipe) Male side Torque rench for Flare Nut Screw 32

33 CUTTING AND FLARING THE PIPING. Please cut using pipe cutter and then remove the burrs. 2. Remove the burrs by using reamer. If burrs is not removed, gas leakage may be caused. Turn the piping end down to avoid the metal powder entering the pipe. 3. Please make flare after inserting the flare nut onto the copper pipes.. To cut Pipe Reamer Point down 2. To remove burrs Handle Bar Yoke Core Clamp handle Red arrow mark 3. To flare Bar 0 /32" (0-0.5 mm) Copper pipe Improper flaring Inclined Surface Cracked Uneven damaged thickness hen properly flared, the internal surface of the flare will evenly shine and be of even thickness. Since the flare part comes into contact with the connections, carefully check the flare finish Evacuation Of The Equipment HEN INSTALLING AN AIR CONDITIONER, BE SURE TO EVACUATE THE AIR INSIDE THE INDOOR UNIT AND PIPES in the following procedure.. Connect a charging hose with a push pin to the Low side of a charging set and the service port of the gas side 3-way valve. 2. Connect the micron gauge between vacuum pump and service port of outdoor units. 3. Turn on the power switch of the vacuum pump and make sure that connect digital micron gauge and to pull down to a value of 0 microns. 4. To make sure micron gauge a value 0 microns and close the low side valve of the charging set and turn off the vacuum pump. 5. Disconnect the vacuum pump house from the service port of the 3-way valve. 6. Tighten the service port caps of gas side 3-way valve at a torque of 3.3 Ibf ft (8 N m) with a torque wrench. 7. Remove the valve caps of both of the 2-way valve and 3-way valve. Position both of the valves to Open using a hexagonal wrench (5/32" (4 mm)). 8. Mount valve caps onto the 2-way valve and 3-way valve. o Be sure to check for gas leakage. Indoor Unit Vacuum pump Indoor Unit Liquid side Gas side Liquid side Gas side Tube connector Tube connector Tube connector Tube connector Liquid side 3-way valve Close Gas side 3-way valve Close Outdoor unit If micron gauge value does not descend 0 microns, take the following measures: - If the leak stops when the piping connections are tightened further, continue working from step. - If the leak does not stop when the connections are retightened, repair location of leak. - Do not release refrigerant during piping work for installation and reinstallation. - Take care when handling the liquid refrigerant, it may cause frostbite. 33

34 0..5 Connect The Cable To The Outdoor Unit. Remove Control Board Cover (Metal) by loosening 2 screws. 2. Remove Valve Cover (Metal) by loosening 2 screws. 3. Remove Plugs. 4. Fix the conduit connectors to the knock out holes with lock-nuts, then secure them. 5. Connecting wire between indoor unit and outdoor unit should be UL listed or CSA approved 4 conductor wires minimum AG6 in accordance with local electric codes. 6. ire Connection to the power supply (8/2V 60Hz) through circuit breaker. o Connect the UL listed or CSA approved wires minimum AG2 to the terminal board, and connect to other end of the wires to circuit breaker. 7. Connect the power supply cord and connecting wires between indoor unit and outdoor unit according to the diagram as shown. Indoor Unit A Indoor Unit B Indoor Unit C Terminal 2 3 Terminal 2 3 Terminal 2 3 8/2V min AG6 8/2V min AG6 8/2V min AG6 Grounding wire min AG6 8/2V min AG6 8/2V min AG6 8/2V min AG6 Grounding wire min AG6 8/2V min AG6 8/2V min AG6 8/2V min AG6 Grounding wire min AG6 Each indoor unit must have its own conduit for the wires between the indoor and outdoor unit but the power supply for the outdoor unit must be in a separate conduit to prevent potential communication problems. Outdoor Unit Terminal L L2 Unit A Unit B Unit C Disconnect Switch Field supply Grounding wire Supply Single Phase 8/2V 60Hz min AG2 Top panel CU-3E9*** Unit A Unit B Screws Control Board Cover (Metal) Lock Nuts Unit C Screws Connectors Valve Cover (Metal) Plugs Knock Out Holes Supply Cord Indoor Unit A Indoor & outdoor connection cable Indoor Unit C Indoor Unit B Side Panel 8. For wire stripping and connection requirement, refer to the diagram below. 9. Secure the power supply cord and connection cables onto the control board with the holder. 0. Attach the control board cover (metal and resin) and valve cover back to the original position with screw. IRE STRIPPING AND CONNECTING REQUIREMENT 3/32" ±/6" (0± mm) ire stripping Noloosestrandwheninserted Indoor/outdoor connecting terminal board 7/32" (5 mm) or more (gap between wires) Conductor fully inserted Conductor over inserted Conductor not fully inserted ACCEPT PROHIBITED PROHIBITED This equipment must be properly earthed. Ground wire must be Yellow/ Green (Y/G) in colour and longer than other AC wires for safety reasons. 34

35 0..6 Heat Insulation Use a material with good heat-resistant properties as the heat insulation for the pipes. Be sure to insulate both the gas-side and liquid-side pipes. If the pipes are not adequately insulated, condensation or water leakages may occur. Liquid-side pipes Gas-side pipes Material shall withstand 248 F ( C) or higher 0..7 Disposal Of Outdoor Unit Drain ater If a drain elbow is used, the unit should be placed on a stand which is taller than -3/32" ( mm). If the unit is used in an area where temperature falls below 32 F (0 C) for 2 or 3 days in succession, it is recommended not to use a drain elbow, for the drain water freezes and the fan will not rotate. Drain elbow Install the hose at an angle so that the water smoothly flows out. 35

36 0.2 CU-4E24RBU 0.2. Select The Best Location If an awning is built over the unit to prevent direct sunlight or rain, be careful that heat radiation from the condenser is not obstructed. There should not be any animal or plant which could be affected by hot air discharged. Keep the spaces indicated by arrows from wall, ceiling, fence or other obstacles. Do not place any obstacles which may cause a short circuit of the discharged air. Outdoor Unit Liquid - side Gas - side Refrigerant piping size CU-4E24*** ø/4" (ø6.35 mm) thickness /32" (t0.8 mm) ø3/8" (ø9.52 mm) thickness /32" (t0.8 mm) (ø/2" (ø2.7 mm) thickness /32" (t0.8 mm)) * In the case of indoor unit is CS-E24***, a gaspipe of ø/2" (ø2.7 mm) thickness /32" (t0.8 mm) must be used together with CZ-MA2P (pipe size expander) Outdoor Unit Installation Diagram Installation parts you should purchase ( ) It is advisable to avoid more than 2 blockage directions. For better ventilation & multipleoutdoor installation, please consult authorized dealer/specialist. supply cord ( ) Connection cable ( ) Additional drain hose ( ) /4" Liquid side piping ( ) Outdoor Unit CU-4E24*** Min. total piping length for additional gas 47.6 ft (45 m) If total piping length of all indoor units exceeds the minimum length listed above, charge additionally with 0.2 oz (g) of refrigerant (RA) for each additional foot (meter) of piping. 3/8" Gas side piping ( ) This illustration is for explanation purposes only. * Note: Respective indoor unit installation procedure shall refer to instruction manual provided in the indoor unit packaging. Allowable piping length Outdoor Unit CU-4E24*** Allowable piping length of each indoor unit (min. ~ max.) 9.8 ft ~ 82.0 ft (3 m ~ 25 m) Allowable total piping length of all indoor unit ft ( m) or less Outdoor unit located on upper side g 49.2 ft (5 m) or less Height difference between indoor and outdoor unit Outdoor unit located otherwise h 24.6 ft (7.5 m) or less Outdoor unit located otherwise k 49.2 ft (5 m) or less Height difference between indoor unit Outdoor unit located on upper side i 24.6 ft (7.5 m) or less Outdoor unit located otherwise j 49.2 ft (5 m) or less Outdoor unit located on upper side Outdoor unit located otherwise Indoor unit Outdoor unit g j k j i Outdoor unit h Indoor unit Indoor unit Outdoor unit 36

37 Outdoor Unit Installation Guidelines here a wall or other obstacle is in the path of outdoor unit s intake or exhaust airflow, follow the installation guidelines below. For any of the below installation patterns, the wall height on the exhaust side should be 47-/4" (0 mm) or less. all facing one side alls facing two side alls facing three side More than 3 5/6" (00) More than 39 3/8" (000) More than 3 5/6" (00) More than 39 3/8" (000) More than 3 5/6" (00) 47 /4" (0) or less More than 3 5/6" (00) Side view More than 3 5/6" (00) Top view More than 3/6" (0) More than 39 3/8" (000) Top view Unit : inch (mm) Install The Outdoor Unit After selecting the best location, start installation to Indoor/Outdoor Unit Installation Diagram.. Firmly attach the unit horizontally to concrete or a rigid frame with bolts and nuts (ø3/32" (ø0 mm)). 2. hen installing on a roof, please consider strong winds and earthquakes. Please fasten the installation stand firmly with bolts or nails Connect The Piping Remove the cabinet side plate (metal) from the unit by loosening six screws. Connecting The Piping To Outdoor Unit Decide piping length and then cut by using pipe cutter. Remove burrs from cut edge. Make flare after inserting the flare nut (locate at valve) onto the copper pipe. Align center of piping to valves and then tighten with torque wrench to the specified torque as stated in the table. Model A B C D CU-4E24*** 24-3/32" (6 mm) 6-/6" ( mm) 25/32" ( mm) 4-3/32" (3.5 mm) Do not over tighten, over tightening may cause gas leakage Piping size A Torque /4" [6.35 mm] 3.3 Ibf ft [8 N m (.8 kgf m)] 3/8" [9.52 mm] 3.0 Ibf ft [42 N m (4.3 kgf m)] /2" [2.7 mm].6 Ibf ft [55 N m (5.6 kgf m)] 5/8" [5.88 mm] 47.9 Ibf ft [65 N m (6.6 kgf m)] 3/4" [9.05 mm] 73.8 Ibf ft [00 N m (0.2 kgf m)] Gas Leak Checking Pressure test to system to 0 PSIG with dry nitrogen, in stages. Thoroughly leak check the system. If the pressure holds, release the nitrogen and proceed to section B C D Female side Screw Flare Nut (Connection Pipe) Torque rench for Flare Nut Flare Nut (Connection Pipe) Applicable to Liquid and Gas side of CS-ME5***, CS-ME7***, CS-E9***, CS-E2***, CS-E8*** Liquid side of CS-E24*** Cabinet side plate A Male side Torque rench for Flare Nut Screw B C D Packing Pipe Size Expander Flare Nut (Connection Pipe) Female side Applicable to Gas side of CS-E24*** Male side Torque rench for Flare Nut and Pipe Size Expander 37

38 CUTTING AND FLARING THE PIPING. Please cut using pipe cutter and then remove the burrs. 2. Remove the burrs by using a reamer. If burrs are not removed, gas leakage may occur. Turn the piping end down to avoid the metal powder entering the pipe. 3. Please make flare after inserting the flare nut onto the copper pipes.. To cut Pipe Reamer Point down 2. To remove burrs Handle Bar Yoke Core Clamp handle Red arrow mark 3. To flare Bar 0 /32" (0-0.5 mm) Copper pipe Improper flaring Inclined Surface Cracked Uneven damaged thickness hen properly flared, the internal surface of the flare will shine evenly and be of even thickness. Since the flared part comes into contact with the connections, carefully check the flared finish Evacuation Of The Equipment HEN INSTALLING AN AIR CONDITIONER, BE SURE TO EVACUATE THE AIR INSIDE THE INDOOR UNIT AND PIPES in the following procedure.. Connect a charging hose with a push pin to the Low side of a charging set and the service port of the gas side 3-way valve. 2. Connect the micron gauge between vacuum pump and service port of outdoor units. 3. Turn on the power switch of the vacuum pump and make sure to connect the digital micron gauge and to lower to a value of 0 microns. 4. Make sure micron gauge indicates a value of 0 microns and close the low side valve of the charging set and turn off the vacuum pump. 5. Disconnect the vacuum pump house from the service port of the 3-way valve. 6. Tighten the service port caps of gas side 3-way valve at a torque of 3.3 Ibf ft (8 N m) with a torque wrench. 7. Remove the valve caps of both the 2-way valve and 3-way valve. Position both of the valves to Open using a hexagonal wrench (5/32" (4 mm)). 8. Mount valve caps onto the 2-way valve and 3-way valve. o Be sure to check for gas leakage. Indoor Unit Vacuum pump Indoor Unit Liquid side Gas side Liquid side Gas side Tube connector Tube connector Tube connector Tube connector Liquid side 3-way valve Close Gas side 3-way valve Close Outdoor unit If micron gauge value does not descend 0 microns, take the following measures: - If the leak stops when the piping connections are tightened further, continue working from step. - If the leak does not stop when the connections are retightened, repair location of leak. - Do not release refrigerant during piping work for installation and reinstallation. - Be careful when handling the liquid refrigerant, it may cause frostbite. 38

39 0.2.5 Connect The Cable To The Outdoor Unit. Remove Plugs. 2. Fix the conduit connectors to the knock out holes with lock-nuts, then secure them. 3. Connecting wire between indoor unit and outdoor unit should be UL listed or CSA approved 4 conductor wires minimum AG6 in accordance with local electric codes. 4. ire Connection to the power supply (8/2V 60Hz) through circuit breaker. o Connect the UL listed or CSA approved wires minimum AG2 to the terminal board, and connect to other end of the wires to circuit breaker. 5. Connect the power supply cord and connecting wires between indoor unit and outdoor unit according to the diagram as shown. Indoor Unit A Indoor Unit B Indoor Unit C Indoor Unit D Terminal 2 3 Terminal 2 3 Terminal 2 3 Terminal 2 3 8/2V min AG6 8/2V min AG6 8/2V min AG6 Grounding wire min AG6 8/2V min AG6 8/2V min AG6 8/2V min AG6 Grounding wire min AG6 8/2V min AG6 8/2V min AG6 8/2V min AG6 Grounding wire min AG6 8/2V min AG6 8/2V min AG6 8/2V min AG6 Grounding wire min AG6 Each indoor unit must have its own conduit for the wires between the indoor and outdoor unit but the power supply for the outdoor unit must be in a separate conduit to prevent potential communication problems. Outdoor Unit Terminal 2 3 Unit A L L2 Unit B Unit C Unit D Disconnect Switch Field supply Grounding wire Supply Single Phase 8/2V 60Hz min AG2 CU-4E24*** Top panel Unit A Unit B Unit C Connectors Unit D Lock Nuts Plug Knock Out Holes Rear panel Supply Cord Indoor & Outdoor connection cable Isolating Devices Indoor Unit A Indoor Unit D Indoor Unit B Indoor Unit C 6. For wire stripping and connection requirement, refer to the diagram below. 7. Secure the power supply cord and connection cables onto the control board with the holder. 8. Fix the cabinet side plate (metal) back to the original position with screws. IRE STRIPPING AND CONNECTING REQUIREMENT ire stripping Indoor/outdoor Conductor fully connecting inserted terminal board 3/32" ±/6" (0±mm) No loose strand when inserted 7/32" (5mm) or more (gap between wires) Conductor over inserted Conductor not fully inserted ACCEPT PROHIBITED PROHIBITED This equipment must be properly earthed. Ground wire shall be Yellow/ Green (Y/G) in colour and longer than other AC wires for safety reason. 39

40 0.2.6 Heat Insulation Use a material with good heat-resistant properties as the heat insulation for the pipes. Be sure to insulate both the gas-side and liquid-side pipes. If the pipes are not adequately insulated, condensation or water leakages may occur. Liquid-side pipes Material shall withstand 248 F Gas-side pipes ( C) or higher Disposal Of Outdoor Unit Drain ater If a drain elbow is used, the unit should be placed on a stand which is taller than -3/32" ( mm). If the unit is used in an area where temperature falls below 32 F (0 C) for 2 or 3 days in succession, it is recommended not to use a drain elbow, for the drain water freezes and the fan will not rotate. Drain elbow Install the hose at an angle so that the water smoothly flows out.

41 . Operation Control. Cooling Operation.. Outdoor fan control hen cooling operation is enabled, based on outdoor ambient temperature, fan motor control will be adjusted according to figure below: 59.0 F (5 C) RPM free RPM controlled 55.4 F (3 C) 8.6 F (-3 C) OD temp. Stopped..2 Annual Cooling control This control is to enable cooling operation when outdoor ambient temperature is low. Control start conditions: o Cooling operation is activated with compressor ON. o Outdoor ambient temperature is less than 59 F (5 C). Control contents: o hen the above conditions are fulfilled, based on outdoor pipe temperature, the outdoor fan motor will operate according to figure below: 93.2 F (34 C) 75.2 F (24 C) 66.2 F (9 C) RPM up RPM unchanged RPM down Stopped 9.4 F (33 C) 73.4 F (23 C) 64.4 F (8 C) OD Pipe temp. To improve the judgment accuracy during annual cooling control, outdoor ambient temperature sampling for 2 minutes will be activated every 35 minutes under designated fan speed. Control stop conditions: o hen either one of the start conditions are not complied...3 Cooling ful Operation During cooling operation, this control is to concentrate outdoor unit capability to the powerful operation enabled indoor unit by temporary stop the capability supply to low load demand indoor units. Operation start condition: o ful operation ON for targeted indoor unit. Operation content: o If other indoor units (where ful operation are OFF) achieve setting temperature continuously for minute after received powerful command from indoor unit, then capability supply to other indoor units are stopped for minimum 3 minutes. Capability supply stop period follows powerful operation period. Operation stops when comply either one of the following conditions: o hen other indoor units (where ful operation are OFF) is demand for capacity. o hen the powerful operation is OFF for all indoor units. o hen Quiet operation received from indoor unit. o hen protection control starts. 4

42 .2 Heating Operation.2. Outdoor fan control hen heating operation is enabled, based on outdoor ambient temperature, fan motor control will be adjusted according to figure below for Heating overload control: 53.6 F (2 C) RPM controlled RPM free.0 F (0 C).2.2 Heating Room Temp Sampling Control To improve the judgment accuracy, indoor room temperature sampling starts when any indoor unit has stopped capability supplied (heating thermo-off) during heating operation with compressor ON, outdoor unit will send signal to all thermo-off indoor units to ON fan motor and get room temperature sample. To prevent discharge temperature drop at indoor units which is ON when sampling the room temperature of heating thermo-off units, the compressor frequency is increased accordingly. However, if indoor room temperature is much higher compare to remote control setting temperature, before thermo-off, sampling of corresponding indoor unit will be cancelled..2.3 ful Operation 2 OD temp. During cooling / heating operation, this control is to provide fast cooling / heating operation compare to normal operation. Operation start if all condition below are complied: o ful operation ON for indoor unit. o Not under Annual Cooling control. Operation content: o Outdoor fan speed will adjust automatically. o Compressor frequency will adjust automatically. Operation stop when comply either one of the follow conditions: o hen the powerful operation is OFF for all indoor units. o hen annual cooling control activated. 42

43 2. Simultaneous Operation Control Operation modes which can be selected using the remote control unit: o Automatic, Cooling, Dry, Heating and e-ion operation mode. Types of operation modes which can be performed simultaneously o Cooling operation and Cooling, Dry or e-ion operation. o Heating operation and Heating operation. Types of operation modes which cannot be performed simultaneously o During cooling operation, heating operation is impossible at another indoor unit in another room. o The priority is given to cooling operation if the cooling mode is selected first. In another room where heating mode is selected afterward, the POER LED blinks to indicate the heating operation is in standby condition, where the fan is stopped hence no discharged air. o During heating operation, cooling operation is impossible at another indoor unit in another room. o The priority is given to heating operation if the heating mode is selected first. In another room where cooling mode is selected afterward, the POER LED blinks to indicate the cooling operation is in standby condition, where the fan is stopped hence no discharged air. Operation mode priority control o The operation mode designated first by the indoor unit has priority. o If the priority indoor unit stops operation or initiates the fan operation, the priority is transferred to other indoor units. aiting denotes the standby status in which the POER LED blinks (ON for 2.5 seconds and OFF for 0.5 seconds) and the fan is stopped. ROOM A ROOM B Cooling Priority Unit ( st ON) Dry Heating e-ion Non Priority Unit (2 nd ON) Cooling Dry Heating e-ion C D aiting E C C C C C D aiting E D D D D aiting aiting H Stop H H H H C D H E E E Stop E In the e-ion mode, priority is transferred to a non-priority unit. Note C: Cooling operation mode D: Dry operation mode H: Heating operation mode E: e-ion operation mode 43

44 3. Protection Control 3. Freeze Prevention control (Cool) hen received freeze prevention signal from indoor unit, the compressor frequency changes according to indoor heat exchanger temperature. hen indoor unit request capability OFF due to freeze condition, immediately the capability supply to targeted indoor unit stops. 3.2 Dew Prevention control (Cool) hen received dew prevention signal from indoor unit, which according to indoor intake temperature and indoor heat exchanger temperature the compressor frequency changes. 3.3 Electronic Parts Temperature Rise Protection (Cool) This control prevents electronic parts temperature rise during cooling overload condition. Start conditions: o Outdoor ambient temperature is at protection region as shown in figure below: 89.6 F (32 C) Protection Region Normal Region 86.0 F ( C) OD temp o Outdoor unit total current is above 5.0A. Control content o Outdoor fan speed is adjusted accordingly. Control stop condition o hen outdoor ambient temperature is back to normal region. During this control, outdoor fan speed does not reduce for Quiet operation. 3.4 Electronic Parts Temperature Rise Protection 2 (Cool) This control prevents electronic parts temperature rise during cooling/dry operation. Start conditions: o current is at protection region as shown in figure below: 4.74A Protection Region.9A Protection Region Normal Region 3.29A Normal Region.82A current 3E9RBU current 4E24RBU Control content o Outdoor fan speed is adjusted accordingly. Control stop conditions o hen total current is back to normal region. During this control, outdoor fan speed does not reduce for Quiet operation. 44

45 3.5 Cooling overload control (Cool) This control detect outdoor pipe temperature and perform the compressor frequency restriction during cooling operation F (64 C) F (60 C) Comp stop Comp freq restricted Comp freq free 34.6 F (57 C) OD Pipe temp The compressor will be stopped to avoid compressor overloading. 4.0 F (-0.0 C) COMP. ON COMP. OFF 0.4 F (-2.0 C) 3.6 Heating overload control (Heat) Outdoor Air Temperature This control detect indoor pipe temperature and perform the compressor frequency restriction during heating operation..0 F (60 C) 27.4 F (53 C) 8.4 F (48 C) ID Pipe temp Comp stop Comp freq restricted Comp freq maintain Comp freq free This control detect outdoor ambient temperature and perform the fan speed adjustment during heating operation F (2 C) RPM controlled RPM free.0 F (0 C) OD temp The compressor will be stopped to avoid compressor overloading. 5.0 F (-5.0 C) COMP. ON COMP. OFF.4 F (-7.0 C) Outdoor Air Temperature 45

46 3.7 Extreme Low Temperature Compressor low pressure protection control (Heat) This control is to prevent low pressure drops too low during extremely low outdoor ambient temperature to improve the compressor reliability. During heating operation, when outdoor ambient temperature is in Zone, this control will be activated. Compressor frequency restriction will be based on outdoor piping temperature. Comp freq free -9.4 F (-23 C) Zone F (-5 C) Zone OD temp 26.6 F (-3 C) -3.0 F (-25 C) -8.4 F (-28 C) OD pipe Comp freq restricted Comp freq stop -4.8 F (-26 C) 3.8 Deice Control hen outdoor pipe temperature and outdoor air temperature is low, deice operation starts where indoor fan motor and outdoor fan motor stop, indoor unit horizontal vane close and operation LED blink with compressor ON. 3.9 Time Delay Safety Control (Restart Control) The compressor will not restart within three minutes after compressor is stopped. This control is not applicable if the power supply reset or after deice condition. 3.0 seconds Force Operation Once the compressor starts operation, it will not stop its operation for seconds in order to cycle back compressor oil. However, it can be stopped using remote control or Auto OFF/ON button at indoor unit. 3. Current Control By referring to table below, during normal (default) operation, the running current refer to Hi values and during Save Mode, the running current refer to Lo values. hen the outdoor unit total running current (AC) exceeds X value, compressor frequency will decrease. If the running current does not exceed X value for 5 seconds, compressor frequency will increase. However, if total outdoor unit running current exceeds Y value, compressor will be stopped immediately for 3 minutes. Operation Mode Cooling/Soft Dry (A) Cooling/Soft Dry (B) Heating CU-3E9RBU CU-4E24RBU X (A) Y (A) X (A) Y (A) Hi Lo Hi Lo Hi Lo

47 The first minutes of cooling operation, (A) will be applied F (39 C) (B) Outdoor air temperature (A) 00.4 F (38 C) 3.2 IPM (power transistor) Protection Control Overheating Prevention Control o If IPM temperature rises to 76 F ( C), outdoor fan speed will be increased. o hen the IPM temperature rises to 3 F (95 C), compressor operation will stop immediately. o Compressor operation restarts when temperature decreases to 94 F (90 C). o If IPM temperature detected less than -22 F (- C), IPM is judged as open circuit ( F96 is indicated). DC peak current control o hen IPMDC current exceeds set value of.0 ± 3.0 A, the compressor will stop. o If the DC peak current detected within seconds after operation starts, compressor will restart after minute. o If the DC peak current detected seconds or more after operation starts, compressor will restart after 2 minutes. o ithin seconds after compressor restarts, if the DC peak current is exceeded set value continuously for 7 times, all indoor and outdoor relays will be cut off ( F99 is indicated). Error reset can be done by power supply reset. 3.3 Compressor Protection Control (Gas leak detection control ) Control start conditions o For 5 minutes, the compressor continuously operates and total current is low. o During Cooling or Soft Dry operation: Indoor intake temperature indoor piping temperature is below 39.2 F (4 C). o During Heating operation: Indoor pipe temperature indoor intake temperature is below 37.4 F (3 C). o Not during deice control. o Compressor ON with maximum frequency. Control content o Compressor stops (and restart after 3 minutes) o If the conditions above happen 4 times within 60 minutes, the unit will stop operation ( F9 is indicated). 3.4 Compressor Protection Control (Gas leak detection control 2) This control detect gas leakage condition to prevent compressor damage. Control start condition o All connected indoor units capability supply ON. o Compressor ON with maximum frequency. o Not during annual cooling. o Compressor discharge temperature high. Control content o Compressor OFF during this control ( F9 is memorized in EEPROM) o If the above conditions happen 2 times within 60 minutes, indoor units Timer LED will blinks ( F9 is indicated at all indoor units) 47

48 3.5 Valve close detection control This control detects 3-way valve close condition to prevent damage to refrigerant cycle. Start conditions: o For all connected indoor units, if Indoor intake temperature indoor piping temperature are between 28.4 F (-2 C) and 35.6 F (2 C) continuously for 5 minutes after compressor ON at first cooling operation. o The first cooling operation is defined as cooling operation is ON for less than 8 minutes after new installation or after pump down. Control content o During this control, compressor stop, indoor units Timer LED will blink. ( F9 is indicated at indoor units) Error reset can be done by power supply reset or reset by using remote control. 3.6 Compressor discharge high pressure protection control This control protect by using high pressure switch during operation. Start conditions o High pressure switch is activated (from normally close to open) when outdoor operation mode is cooling or heating during compressor running. Control content o Compressor stop when high pressure switch is opened and restart after high pressure switch closed. If this condition happen 4 times within minutes, F94 is indicated. o After minutes, counter is reset if this condition does not happen for 4 times. Control stop conditions o supply reset o Reset by using remote control 48

49 4. Servicing Mode 4. CU-3E9RBU Fig. JP (COOL ONLY) S4 (POER SAVE) S5 (MODE PRIORITY) OFF ON OFF ON S (PUMP DON) S2 (OPERATION TEST) S3 (IRING CHECK) 4.. Pump down operation (S) Operate the pump down process according to the following procedure. o Confirm the valve on the liquid side and gas side are open. o Press PUMP DON button (S) on the Display PCB inside the outdoor unit for more than 5 seconds. Pump down (cooling) operation is performed for 5 minutes. o Set the liquid side 3 way valve to close position and wait until the pressure gauge indicates 0.0MPa (.45 PSI). o Immediate set the gas side valve to close position and then press the PUMP DON button (S) to stop the pump down operation. NOTE: Pump down operation will stop automatically after 5 minutes if PUMP DON switch (S) is not pressed again. Pump down operation is not started within 3 minutes after compressor is stopped. LED Message O O O O Pump down operation in progress Status O: Blinking O O O 3 minutes before operation end O O 2 minutes before operation end O minute before operation end Pump down operation end Liquid shut-off valve Gas shut-off valve Valve lid Close Hexagonal wrench 4..2 Test Run Operation Test operation can be carried out using OPERATION TEST button (S2) on the Display PCB inside the outdoor unit. For Cooling test, press the OPERATION TEST button (S2) for 5 seconds or more but less than 0 seconds, LED and LED 2 will illuminate when shift into cooling test operation. For Heating test, press the OPERATION TEST button (S2) for more than 0 seconds, LED and LED 3 will illuminate when shift into heating test operation. Press the OPERATION TEST button (S2) again to cancel test operation. 49

50 4..3 iring Error Check The unit capable to correct the wiring error automatically by following procedures. o Confirm the valve on the liquid side and gas side is open. o Press IRING CHECK button (S3) on the Display PCB inside the outdoor unit for more than 0 seconds to start wiring check operation. o iring check process will complete in approximately 0 minutes. However, wiring check operation will not start within 3 minutes after compressor is stopped. hen outdoor air temperature is less than 4 F (5 C) or unit has abnormality, wiring check will not start. (See NOTE 2) The LED 2 to LED 6 in Display PCB inside the outdoor unit indicate the possibility of the correction as shown in the table below: LED Message Room A B C - - Status All flashing LED2, 4, 6 and LED 3, 5 alternatively flashing Flashing one after another Automatic correction impossible iring check in progress Automatic correction completed Other than above Unit has abnormality (NOTE 4) If automatic correct is impossible, check the indoor unit wiring and piping manually. iring automatic correct example Terminal block From Room B to the living room From Room A to the bedroom From Room C to the kitchen iring error check LED lighting sequence after a wiring correction. Order of LED flashing: 3--> 2--> 4 NOTE:. For two rooms connection, LED 4 and 5 are not illuminated and for three rooms connections, LED 5 is not illuminated after wiring operation complete. 2. If the outdoor air temperature is less than 4 F (5 C) or unit has abnormality, wiring operation will not start. 3. After wiring check operation is complete, LED indication will illuminated until normal operation starts. 4. Follow the product diagnosis procedure. 5. hen LED only illuminate, indicates that outdoor unit is operating normally Save Mode Save Mode can be enabled by pushing POER SAVE switch (S4) to ON before power supply ON. hen Save Mode is ON, the unit can be operate at lower running current where the breaker capacity not achieve the requirement Mode priority function Mode priority function can be enabled by pushing MODE PRIORITY switch (S5) to ON before power supply ON. hen Mode Priority Function is ON, the mode priority is given to higher capacity indoor units Cooling only function The unit capable to limit the operation mode to Cooling Mode only (Heating mode disabled) by cutting JP (COOL ONLY) before power supply ON. This function prevent wrong operation during the unit installed in server room. This function could be disabled again by short the JP (COOL ONLY) before power supply ON.

51 4.2 CU-4E24RBU Fig. S5 (MODE PRIORITY) S4 (POER SAVE) S (PUMP DON) S2 (OPERATION TEST) S3 (IRING CHECK) OFF ON OFF ON JP (COOL ONLY) Unit A Unit B Unit C Unit D 4.2. Pump down operation (S) Operate the pump down process according to the following procedure. o Confirm the valve on the liquid side and gas side are open. o Press PUMP DON button (S) on the Display PCB inside the outdoor unit for more than 5 seconds. Pump down (cooling) operation is performed for 5 minutes. o Set the liquid side 3 way valve to close position and wait until the pressure gauge indicates 0.0MPa (.45 PSI). o Immediate set the gas side valve to close position and then press the PUMP DON button (S) to stop the pump down operation. NOTE: Pump down operation will stop automatically after 5 minutes if PUMP DON switch (S) is not pressed again. Pump down operation is not started within 3 minutes after compressor is stopped. LED Message O O O O Pump down operation in progress Status O O O 3 minutes before operation end O O 2 minutes before operation end O minute before operation end Pump down operation end Gas shut-off valve Liquid shut-off valve Hexagonal wrench Close O: Flashing Valve lid Test Run Operation Test operation can be carried out using OPERATION TEST button (S2) on the Display PCB inside the outdoor unit. For Cooling test, press the OPERATION TEST button (S2) for 5 seconds or more but less than 0 seconds, LED and LED 2 will illuminate when shift into cooling test operation. For Heating test, press the OPERATION TEST button (S2) for more than 0 seconds, LED and LED 3 will illuminate when shift into heating test operation. Press the OPERATION TEST button (S2) again to cancel test operation. 5

52 4.2.3 iring Error Check The unit capable to correct the wiring error automatically by following procedures. o Confirm the valve on the liquid side and gas side is open. o Press IRING CHECK button (S3) on the Display PCB inside the outdoor unit for more than 0 seconds to start wiring check operation. o iring check process will complete in approximately - 25 minutes. However, wiring check operation will not start within 3 minutes after compressor is stopped. hen outdoor air temperature is less than 4 F (5 C) or unit has abnormality, wiring check will not start. (See NOTE 2) The LED 2 to LED 6 in Display PCB inside the outdoor unit indicate the possibility of the correction as shown in the table below: LED Message Room A B C D - Status All flashing LED2, 4, 6 and LED 3, 5 alternatively flashing Flashing one after another Automatic correction impossible iring check in progress Automatic correction completed Other than above Unit has abnormality (NOTE 4) If automatic correct is impossible, check the indoor unit wiring and piping manually. Automatic wiring correction example Terminal block From Room Btothe living room From Room A to the bed room From Room Ctothe kitchen iring error check From Room Dtothe children room LED lighting sequence after a wiring correction. Order of LED flashing: 3--> 2--> 4--> 5 NOTE:. For two rooms, LED 4,5 and 6 are not illuminated, for three rooms, LED 5 and 6 are not illuminated and for four rooms, LED 6 is not illuminated after wiring operation complete. 2. If the outdoor air temperature is less than 4 F (5 C) or unit has abnormality, wiring operation will not start. 3. After wiring check operation is complete, LED indication will illuminated until normal operation starts. 4. Follow the product diagnosis procedure. (Check the diagnostic label at the cabinet side plate.) 5. hen LED only illuminate, indicates that outdoor unit is operating normally Save Mode Save Mode can be enabled by pushing POER SAVE switch (S4) to ON before power supply ON. hen Save Mode is ON, the unit can be operate at lower running current where the breaker capacity not achieve the requirement Mode priority function Mode priority function can be enabled by pushing MODE PRIORITY switch (S5) to ON before power supply ON. hen Mode Priority Function is ON, the mode priority is given to higher capacity indoor units Cooling only function The unit capable to limit the operation mode to Cooling Mode only (Heating mode disabled) by cutting JP (COOL ONLY) before power supply ON. This function prevent wrong operation during the unit installed in server room. This function could be disabled again by short the JP (COOL ONLY) before power supply ON. 52

53 5. Troubleshooting Guide 5. Self Diagnosis Function The display screen of wireless remote control unit and the self-diagnosis LEDs (green) on the outdoor printed circuit board in the outdoor unit can be used to identify the location of the problem. Refer to the table below to identify and solve the cause of the problem, and then re-start the air conditioner system. If the problem is solved and operation returns to normal. LED illuminates and others LED are off. Diagnosis display H H2 H5 H6 H27 H28 H32 H33 H36 H37 H64 H97 H98 Abnormality or protection control Indoor/outdoor abnormal communication Indoor unit capacity unmatched Compressor temperature sensor abnormality Outdoor current transformer (CT) abnormality Outdoor air temperature sensor abnormality Outdoor heat exchanger temperature sensor abnormality Outdoor heat exchanger temperature sensor 2 abnormality Indoor/outdoor misconnection abnormality Outdoor gas pipe temperature sensor abnormality Outdoor liquid pipe temperature sensor abnormality Outdoor high pressure sensor abnormality Outdoor fan motor mechanism lock Indoor high pressure protection LED 6 LED 5 LED 4 LED 3 LED 2 LED Abnormality judgment O O O O O After operation for minute 90s after power supply Continuous for 5s Protection operation Indoor fan only operation can start by entering into force cooling operation O O - - O O O O O Continuous for 5s Continuous for 5s Continuous for 5s O O - - O O O O O O O O O O Continuous for 5s Continuous for 5s Continuous for minute 2 times happen within minutes Heating protection operation only Cooling protection operation only O O O Problem Indoor/outdoor communication not establish indoor capability more than maximum limit or less than minimum limit, or number of indoor unit less than two Compressor temperature sensor open or short circuit Current transformer faulty or compressor faulty Outdoor air temperature sensor open or short circuit Outdoor heat exchanger temperature sensor open or short circuit Outdoor heat exchanger temperature sensor 2 open or short circuit Indoor and outdoor rated voltage different Outdoor gas pipe temperature sensor open and short circuit Outdoor liquid pipe temperature sensor open or short circuit High pressure sensor open circuit during compressor stop Outdoor fan motor lock or feedback Indoor high pressure protection (Heating) Check location Indoor/outdoor wire terminal Indoor/outdoor PCB Indoor/outdoor connection wire Indoor/outdoor connection wire Indoor/outdoor PCB Specification and combination table in catalogue Compressor temperature sensor lead wire and connector Outdoor PCB faulty or compressor faulty Outdoor air temperature sensor lead wire and connector Outdoor heat exchanger temperature sensor lead wire and connector Outdoor heat exchanger temperature sensor 2 lead wire and connector Indoor and outdoor units check Outdoor gas pipe temperature sensor lead wire and connector Outdoor liquid pipe temperature sensor lead wire and connector High pressure sensor Lead wire and connector Outdoor fan motor lead wire and connector Fan motor lock or block Check indoor heat exchanger Air filter dirty Air circulation short circuit 53

54 Diagnosis display H99 F F7 F90 F9 F93 F94 F95 F96 F97 F98 F99 Abnormality or protection control Indoor operating unit freeze protection 4-way valve switching abnormality Indoor standby units freezing abnormality factor correction (PFC) circuit protection Refrigeration cycle abnormality Compressor abnormal revolution Compressor discharge pressure overshoot protection Outdoor cooling high pressure protection transistor module overheating protection Compressor overheating protection running current protection Outdoor direct current (DC) peak detection LED 6 LED 5 LED 4 LED 3 LED 2 LED Abnormality judgment O O O Protection operation O O O - - O O O O O O O O O O O O O O O O O O O O O O O O O O 4 times happen within minutes 3 times happen within minutes 4 times happen within minutes 4 times happen within 60 minutes 4 times happen within minutes 4 times happen within minutes 4 times happen within minutes 4 times happen within minutes 3 times happen within minutes 3 times happen within minutes Continuous happen for 7 times Problem Indoor freeze protection (Cooling) 4-way valve switching abnormal rong wiring and connecting pipe, expansion valve leakage factor correction circuit abnormal Refrigeration cycle abnormal Compressor abnormal revolution Compressor discharge pressure overshoot Cooling high pressure protection transistor module overheat - Compressor overheat - current protection - transistor module current protection Check location Check indoor heat exchanger Air filter dirty Air circulation short circuit 4-way valve Lead wire and connector Check indoor/outdoor connection wire and pipe Indoor heat exchanger sensor lead wire and connector Expansion valve lead wire and connector Outdoor PCB faulty Insufficient refrigerant or valve close transistor module faulty or compressor lock Check refrigeration system Check refrigeration system Outdoor air circuit PCB faulty Outdoor air circuit (fan motor) Insufficient refrigerant Check refrigeration system source or compressor lock transistor module faulty or compressor lock LED illuminate is indicated that outdoor unit is operating normally. If the LED is switched off or flashing, check the power supply and self-diagnosis indication Illuminate Flashing Blank OFF 54

55 5.2 Self-diagnosis Method 5.2. H (Indoor/Outdoor Abnormal Communication) Malfunction Decision Conditions During standby and operation of cooling and heating, the data received from outdoor unit in indoor unit signal transmission is checked whether it is normal. Malfunction Caused Faulty outdoor unit PCB. Faulty indoor unit PCB. Indoor-outdoor signal transmission error due to wrong wiring. Indoor-outdoor signal transmission error due to breaking of wire in the connection wires between the indoor and outdoor units. Indoor-outdoor signal transmission error due to disturbed power supply waveform. Abnormality Judgment: After operation for minute. Troubleshooting For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component. Check the indoor-outdoor units connection wires. Is there any wiring error? No Disconnect terminal 3 wire and measure Vdc between terminal 2 & 3 from the outdoor unit. Yes Correct the indoor-outdoor units connection wires. Is the Vdc fluctuate between 0-Vdc? Yes Reconnect terminal 3 wire and measure Vdc between terminal 2 & 3 from the outdoor unit. Yes Is the Vdc fluctuate between 0-Vdc? No No Replace outdoor unit PCB. Replace indoor unit PCB. 55

56 Communication voltage measurement: Indoor signal Outdoor signal about Vdc about Vdc To determine if outdoor PCB or indoor PCB is faulty: Start with outdoor terminal first. Remove terminal 3 wire. Measure with a multimeter (voltage in DC range). If it is never constant, outdoor PCB is good fluctuating in between 0-Vdc, outdoor PCB is in good condition. 56

57 5.2.2 H2 (Indoor Unit Unmatched) Malfunction Decision Conditions Occur when connect in a multi free inverter system. However, for single split system (ONLY: CS-E2~24DKE; I/D capacity more than 5.0k), when indoor and outdoor are disconnected from one another, H2 will appear but with conditions. Malfunction Caused rong models interconnected. rong indoor unit and outdoor unit PCBs used. Indoor unit or outdoor unit PCB defective. Indoor-outdoor signal transmission error due to wrong wiring. Indoor-outdoor signal transmission error due to breaking of wire 3 in the connection wires between the indoor and outdoor units. Abnormality Judgment: 90 seconds after power supply turn ON. Troubleshooting For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component. Check the indoor-outdoor units connection wires. Is there any wiring error? No Check indoor and outdoor units model number. Yes Correct the indoor-outdoor units connection wires. Check the indoor unit capacity. Is it within the min max outdoor limit? Yes Is the indoor and outdoor model number matched? Yes Check the spare part numbers of the indoor and outdoor unit PCBs and compare with their Part Lists. No No Correct to the allowed connectible indoor unit Match the compatible model. Matched compatibility? Yes No Change for the specified indoor or outdoor unit PCB. Replace the indoor and outdoor unit PCBs. 57

58 5.2.3 H5 (Compressor Temperature Sensor Abnormality) Malfunction Decision Conditions During startup and operation of cooling and heating, the temperatures detected by the compressor discharge temperature sensor are used to determine sensor errors. Malfunction Caused Faulty connector connection. Faulty sensor. Faulty outdoor unit PCB. Abnormality Judgment: Continue for 5 seconds. Troubleshooting For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component. Check the CN-DIS connector connection: - Turn OFF the power - Check the connector connection Is the CN-DIS connector connection normal? Yes No - Connector poor contact - Correct the connection Check the compressor discharge temperature sensor: - Plug out connector from the outdoor unit PCB - Measure the resistance of the compressor discharge temperature sensor Resistance (kω) 60 0 Compressor / DischargeTemp. Sensor (Thermistor) Characteristics Is the measured resistance of the compressor discharge temperature sensor matches the value specified in its characteristic chart? Yes No - Defect in compressor discharge temperature sensor - Replace the compressor discharge temperature sensor - Defect in outdoor unit PCB - Replace the outdoor unit PCB 0 (68) (04) 60 () (76) 00 (22) Temperature C ( F) (248) (284) 58

59 5.2.4 H6 (Outdoor Current Transformer (CT) Abnormality) Malfunction Decision Conditions A current transformer (CT) is detected by checking the compressor running frequency ( rated frequency) and CT detected input current (less than.25a) for continuously seconds. Malfunction Caused CT defective. Outdoor PCB defective. Compressor defective (low compression). Abnormality Judgment: --- Troubleshooting For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component. Check the functionality of current transformer (CT). Is the CT open circuit? No Force cooling operation and measure:. Running current 2. Suction pressure Yes Replace the outdoor PCB. Is the running current less than.25a? Yes Replace compressor due to compressor low compression. No Replace the indoor and outdoor unit PCBs. 59

60 5.2.5 H27 (Outdoor Air Temperature Sensor Abnormality) Malfunction Decision Conditions During startup and operation of cooling and heating, the temperatures detected by the outdoor intake air temperature sensor are used to determine sensor errors. Malfunction Caused Faulty connector connection. Faulty sensor. Faulty PCB. Abnormality Judgment: Continue for 5 seconds. Troubleshooting For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component. Check the connector connection: - Turn off the power - Check the connector connection Is the connector connection normal? Yes No - Connector poor contact - Correct the connection Check the outdoor intake air temperature sensor: - Plug out connector from the outdoor unit PCB - Measure the resistance of the outdoor intake air temperature sensor Resistance (kω) Sensor (Thermistor) Characteristics Outdoor Air Sensor 2 Outdoor Heat Exchanger Sensor Is the measured resistance of the outdoor intake air temperature sensor matches the value specified in its characteristic chart? Yes No - Defect in outdoor intake air temperature sensor - Replace the outdoor intake air temperature sensor -DefectinoutdoorunitPCB - Replace the outdoor unit PCB 0-0 (4) 0 (32) 0 () (68) Temperature C ( F) (86) (04) (22) 60

61 5.2.6 H28 (Outdoor Heat Exchanger Temperature Sensor Abnormality) Malfunction Decision Conditions During startup and operation of cooling and heating, the temperatures detected by the outdoor pipe temperature sensor are used to determine sensor errors. Malfunction Caused Faulty connector connection. Faulty sensor. Faulty PCB. Abnormality Judgment: Continue for 5 seconds. Troubleshooting For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component. Check the connector connection: -Turnoffthepower - Check the connector connection Is the connector connection normal? Yes No - Connector poor contact - Correct the connection Check the outdoor pipe temperature sensor: - Plug out connector from the outdoor unit PCB - Measure the resistance of the outdoor pipe temperature sensor Resistance (kω ) Sensor (Thermistor) Characteristics Outdoor Air Sensor 2 Outdoor Heat Exchanger Sensor Is the measured resistance of the outdoor pipe temperature sensor matches the value specified in its characteristic chart? Yes No - Defect in outdoor pipe temperature sensor - Replace the outdoor pipe temperature sensor - Defect in outdoor unit PCB - Replace the outdoor unit PCB 0-0 (4) 0 (32) 0 () (68) Temperature C ( F) (86) (04) (22) 6

62 5.2.7 H32 (Outdoor Heat Exchanger Temperature Sensor 2 Abnormality) Malfunction Decision Conditions During startup and operation of cooling and heating, the temperatures detected by the outdoor pipe temperature sensor 2 are used to determine sensor errors. Malfunction Caused Faulty connector connection. Faulty sensor. Faulty outdoor unit PCB. Abnormality Judgment: Continue for 5 seconds. Troubleshooting For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component. Check the CN-TH2 connector connection: -TurnOFFthepower - Check the connector connection IstheCN-TH2connector connection normal? Yes No -Connectorpoorcontact - Correct the connection Check the outdoor pipe temperature sensor 2: - Plug out connector from the outdoor unit PCB - Measure the resistance of the outdoor pipe temperature sensor 2 Resistance (kω) Sensor (Thermistor) Characteristics Outdoor Air Sensor 2 Outdoor Heat Exchanger Sensor Is the measured resistance of the outdoor pipe temperature sensor 2 matches the value specified in its characteristic chart? Yes No - Defect in outdoor pipe temperature sensor 2 - Replace the outdoor pipe temperature sensor 2 - Defect in outdoor unit PCB - Replace the outdoor unit PCB 0-0 (4) 0 (32) 0 () (68) (86) Temperature C ( F) (04) (22) 62

63 5.2.8 H33 (Indoor / Outdoor Misconnection Abnormality) Malfunction Decision Conditions The supply power is detected for its requirement by the indoor/outdoor transmission. Malfunction Caused rong models interconnected. rong indoor unit and outdoor unit PCBs used. Troubleshooting For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component. Check indoor and outdoor units model number. Is the indoor and outdoor model number matched? Yes Check the spare part numbers of the indoor and outdoor unit PCBs and compare with their Part Lists. No Match the compatible model. Matched compatibility? Yes No Change for the specified indoor or outdoor unit PCB. Replace the indoor and outdoor unit PCBs. 63

64 5.2.9 H36 (Outdoor Gas Pipe Temperature Sensor Abnormality) Malfunction Decision Conditions During startup and operation of cooling and heating, the temperatures detected by the outdoor gas pipe temperature sensor are used to determine sensor errors. Malfunction Caused Faulty connector connection. Faulty sensor. Faulty PCB. Abnormality Judgment: Continue for 5 seconds. Troubleshooting For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component. Check the connector connection: - Turn off the power - Check the connector connection Is the connector connection normal? Yes No - Connector poor contact - Correct the connection Check the outdoor gas pipe temperature sensor: - Plug out connector from the outdoor unit PCB - Measure the resistance of the outdoor gas pipe temperature sensor Resistance (kω) Sensor (Thermistor) Characteristics Outdoor Air Sensor 2 Outdoor Heat Exchanger Sensor Is the measured resistance of the outdoor gas pipe temperature sensor matches the value specified in its characteristic chart? Yes No - Defect in outdoor gas pipe temperature sensor - Replace the outdoor gas pipe temperature sensor - Defect in outdoor unit PCB - Replace the outdoor unit PCB 0-0 (4) 0 (32) 0 () (68) (86) Temperature C ( F) (04) (22) 64

65 5.2.0 H37 (Outdoor Liquid Pipe Temperature Sensor Abnormality) Malfunction Decision Conditions During startup and operation of cooling and heating, the temperatures detected by the outdoor liquid pipe temperature sensor are used to determine sensor errors. Malfunction Caused Faulty connector connection. Faulty sensor. Faulty PCB. Abnormality Judgment: Continue for 5 seconds. Troubleshooting For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component. Check the connector connection: - Turn off the power - Check the connector connection Is the connector connection normal? Yes No - Connector poor contact - Correct the connection Check the outdoor liquid pipe temperature sensor: - Plug out connector from the outdoor unit PCB - Measure the resistance of the outdoor liquid pipe temperature sensor Resistance (kω) Sensor (Thermistor) Characteristics Outdoor Air Sensor 2 Outdoor Heat Exchanger Sensor Is the measured resistance of the outdoor liquid pipe temperature sensor matches the value specified in its characteristic chart? Yes No - Defect in outdoor liquid pipe temperature sensor - Replace the outdoor liquid pipe temperature sensor - Defect in outdoor unit PCB - Replace the outdoor unit PCB 0-0 (4) 0 (32) 0 () (68) (86) Temperature C ( F) (04) (22) 65

66 5.2. H97 (Outdoor Fan Motor Mechanism Locked) Malfunction Decision Conditions The rotation speed detected by the Hall IC during fan motor operation is used to determine abnormal fan motor. Malfunction Caused Operation stop due to short circuit inside the fan motor winding. Operation stop due to breaking of wire inside the fan motor. Operation stop due to breaking of fan motor lead wires. Operation stop due to Hall IC malfunction. Operation error due to faulty outdoor unit PCB. Abnormality Judgment: 2 times happen within minutes. Troubleshooting For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component. Turn off power supply and rotate fan by hand. Does fan rotate smoothly? Yes No Replace fan motor. Turn off power supply and disconnect fan motor connector, then turn power on. Check the output of fan motor from outdoor PCB. Turn power supply on and operate fan. Is the motor power supply voltage ~325Vdc (pin & 4) generated? No Replace outdoor PCB. Does it rotate? Stop fan motor. No Yes Is the motor control voltage 5Vdc (pin4 & 5) generated? Yes No Replace outdoor PCB. Check the rotation feedback output from fan motor. Operate the fan, is the rotation command voltage -5Vdc (pin4 & 6) generated? No Replace outdoor PCB. Rotate the fan motor by hand, is the rotation feedback voltage 5Vdc (pin4 & 7) generated? No Replace fan motor. Yes Replace fan motor. Yes Replace outdoor PCB. 66

67 5.2.2 H98 (Indoor High Pressure Protection) Malfunction Decision Conditions During heating operation, the temperature detected by the indoor pipe temperature sensor is above 60 C ( F). Malfunction Caused Clogged air filter of the indoor unit. Dust accumulation on the indoor unit heat exchanger. Air short circuit. Detection error due to faulty indoor pipe temperature sensor. Detection error due to faulty indoor unit PCB. Troubleshooting Check the air passage. For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component. Is there any short circuit? No Yes Provide sufficient air passage. Check the air filter. Check the indoor pipe temperature sensor. Is the air filter dirty? No Check the dust accumulation on the indoor unit heat exchanger. Yes Clean the air filter. Does it conform to the sensor characteristic chart? No Yes Replace the indoor unit PCB. Replace the indoor pipe temperature sensor. Is the indoor unit heat exchanger dirty? No Yes Clean the heat exchanger. 67

68 5.2.3 H99 (Indoor Operating Unit Freeze Protection) Malfunction Decision Conditions During cooling operation, anti-freezing control take place when indoor pipe temperature is lower than 0 C (32 F). Malfunction Caused Clogged air filter of the indoor unit. Dust accumulation on the indoor unit heat exchanger. Air short circuit. Detection error due to faulty indoor pipe temperature sensor. Detection error due to faulty indoor unit PCB. Troubleshooting Check the air passage. For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component. Is there any short circuit? No Yes Provide sufficient air passage. Check the air filter. Check the indoor pipe temperature sensor. Is the air filter dirty? No Check the dust accumulation on the indoor unit heat exchanger. Yes Clean the air filter. Does it conform to the sensor characteristic chart? No Yes Replace the indoor unit PCB. Replace the indoor pipe temperature sensor. Is the indoor unit heat exchanger dirty? No Yes Clean the heat exchanger. 68

69 5.2.4 F (4-ay Valve Switching Abnormality) Malfunction Decision Conditions During heating operation, when (liquid pipe temperature outdoor pipe temperature) is below -5 C (23 F). During cooling operation, when (outdoor pipe temperature liquid pipe temperature) is below -5 C (23 F). Malfunction Caused Connector in poor contact. Faulty sensor. Faulty outdoor unit PCB. Four way valve defective. Abnormality Judgment: 4 times happen within minutes. Troubleshooting Check the liquid pipe and outdoor pipe temperature sensors. Does it conform to the sensor characteristic chart? Yes Is F occur during heating operation? No Is the four way valve coil energize during cooling operation? No No Replace the liquid pipe and outdoor pipe temperature sensor. Yes Yes Replace the outdoor unit PCB. Replace the four way valve. For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component. Four way valve coil disconnected (loose)? No Harness out of connector? No Check the continuity of the four way valve coil. Disconnect the harness from the connector. Valve coil winding resistance no open circuit? Yes Measure AC voltage supplied during heating operation. Yes No Correct the four way valve coil. Reconnect the harness. Replace the four way valve coil. CN-HOT (VH3-2) 2 3 4AYS VALVE Is the voltage supply to four way valve 2-2Vac? Yes No Replace the outdoor unit PCB. Replace the four way valve. 69

70 5.2.5 F7 (Indoor Standby Units Freezing Abnormality) Malfunction Decision Conditions hen the difference between indoor intake air temperature and indoor pipe temperature is above 0 C ( F) or indoor pipe temperature is below -.0 C (.2 F). Malfunction Caused rong wiring connection. Faulty sensor. Faulty expansion valve. Abnormality Judgment: 3 times happen within minutes. Troubleshooting Check the system wiring connection. For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component. Is the wiring connection ok? Yes Check the indoor intake air and indoor pipe temperature sensors. No Perform Auto iring to correct the wiring connection. Does it conform to the sensor characteristic chart? Yes Check the expansion valve. No Replace the indoor intake air or indoor pipe temperature sensor. Is the expansion valve ok? No Electronic Expansion Valve Check Conduct the following check points: Check if expansion valve connector is properly inserted and v-coil is properly latched to the valve. Turn on the power and check if latching sound is generated (touch the valve with a screw driver and bring it closer to your ear). If latching sound is not generated, remove the connector and check v-coil conductivity between pin and other pins (~ohm) and between each pins (~90ohm). If v-coil has no conductivity, v-coil is faulty. If v-coil has conductivity, mount good v-coil. If still no latching, then replace the valve unit or replace outdoor control PCB. Yes Replace the solenoid coil or expansion valve Replace outdoor unit PCB. EXPANSION VALVE MOTOR V-Coil Expansion Valve

71 5.2.6 F90 ( Factor Correction (PFC) Circuit Protection) Malfunction Decision Conditions During startup and operation of cooling and heating, when PFC protection circuitry at the outdoor unit main PCB senses low DC voltage level (below 2Vdc). Malfunction Caused Low DC voltage due to power supply drop. Low DC voltage due to compressor windings not uniform. Reactor connection is disconnected. Faulty outdoor unit PCB. Abnormality Judgment: 4 times happen within minutes. Troubleshooting Check the supply voltage For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component. Supply voltage as specified? Yes Check the reactor connection No Correct the power supply. Check the compressor winding resistance: - Turn off the power supply and disconnect the harnesses U, V, and - Measure the winding resistance between U-V, V-, and -U Is the reactor connector connection ok? Yes No - Connector disconnected - Correct the connection Are the compressor s winding resistance (U-V, V-, U-) uniform? Operate the system. Verify PFC abnormality by measuring DC voltage between P (red) and N (black) terminal at the outdoor inverter PCB. Yes No Replace the compressor. Is the DC voltage between P (red) and N (black) terminal normal (between Vdc)? No - Defect in DC supply/pfc circuitry - Replace the DB/SPM PCB / Inverter PCB Yes Replace the outdoor unit PCB. 7

72 5.2.7 F9 (Refrigeration Cycle Abnormality) Malfunction Decision Conditions Gas shortage detection I: A gas shortage is detected by checking the CT-detected input current value and the compressor running frequency. During startup and operating of cooling and heating, input current < 8.78/256 (A/Hz) x compressor running frequency Gas shortage detection II: A gas shortage is detected by checking the difference between indoor pipe temperature and indoor intake air temperature during cooling and heating. Malfunction Caused Refrigerant shortage (refrigerant leakage). Poor compression performance of compressor. 2/3 way valve closed. Detection error due to faulty indoor intake air and indoor pipe temperature sensors. Abnormality Judgment: 4 times happen within 60 minutes. Troubleshooting For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component. Check the indoor intake air and indoor pipe temperature sensors. Does it conform to the sensor characteristic chart? Yes 2/3 way valve closed? No No Yes Replace the indoor intake air or indoor pipe temperature sensor. Open the 2/3 way valve. Capillary tube or dryer clogged? No Charge for a specified amount of fresh refrigerant. Yes Replace the capillary tube or dryer. Check for gas leakage. Refrigeration cycle abnormality error again? Yes - Replace outdoor unit PCB - Compressor Oil oozing out from the 2/3 way valve? Yes Repair the pipe flare or union nuts. Reclaim and recharge refrigerant. No Procedure complete. No 72

73 5.2.8 F93 (Compressor Abnormal Revolution) Malfunction Decision Conditions A compressor rotation failure is detected by checking the compressor running condition through the position detection circuit. Malfunction Caused Compressor terminal disconnect. Outdoor PCB malfunction. Abnormality Judgment: 4 times happen within minutes. Troubleshooting For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component. Turn off power supply. Disconnect U, V, and wires. Check with inverter checker. Normal? Yes No - IPM defective -Replace outdoor unit PCB Replace compressor. 73

74 5.2.9 F94 (Compressor Discharge Pressure Overshoot Protection) Malfunction Decision Conditions During operation of cooling and heating, when the outdoor unit high pressure switch is open (4.5MPa and above). Malfunction Caused Clogged air filter of indoor unit. Dust accumulation on the indoor/outdoor unit heat exchanger. Air short circuit at indoor/outdoor unit. 3 way valve closed. Faulty outdoor unit fan motor. Excess refrigerant. Clogged expansion valve or strainer. Faulty outdoor unit high pressure switch. Faulty outdoor unit PCB (main). Abnormality Judgment: 4 times happen within minutes. Troubleshooting For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component. Get restarted and measure the gauge pressure. Is the gauge pressure >4.5MPa? Yes Check the indoor air filter or dust accumulation on the indoor/outdoor unit heat exchanger. Is the indoor filter or indoor/outdoor unit heat exchanger dirty? No Check the indoor/outdoor air passage. Is there any short circuit? No No Yes Yes Replace the outdoor unit PCB (main). Clean the indoor air filter or heat exchanger. Provide sufficient air passage. Check the outdoor unit fan motor operation. Is the outdoor unit fan motor operate normally? Yes Check refrigerant amount. Is the additional refrigerant amount filled correctly? Yes Check for clogged expansion valve or strainer. Is the expansion valve or strainer clogged (ice formed)? No Reclaim and recharge for a specified amount of fresh refrigerant. No No Yes Replace the outdoor unit fan motor and/or outdoor unit PCB (main). Reclaim and recharge with correct amount of refrigerant. - Replace the expansion valve and/or strainer - Reclaim and recharge refrigerant Check the 3 way valve. Is the 3 way valve closed? No Yes Open the 3 way valve. Is abnormality happened again? No Yes - Replace the outdoor unit PCB (main) - Replace the outdoor unit high pressure switch Procedure complete 74

75 5.2. F96 ( Transistor Module Overheating Protection) Malfunction Decision Conditions Compressor Overheating: During operation of cooling and heating, when the compressor OL is activated. Heat Sink Overheating: During operation of cooling and heating, when heat sink temperature data (90 C (94 F)) is detected by the heat sink temperature sensor. Malfunction Caused Compressor OL connector poor contact. Compressor OL faulty. IPM overheat due to short circuit of hot discharge air flow. IPM overheat due to defective of outdoor fan motor. IPM overheat due to defective of internal circuitry of IPM. IPM overheat due to defective IPM temperature sensor. Abnormality Judgment: 4 times happen within minutes. Troubleshooting For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component. Check the outdoor unit installation condition (during cooling or softdry operation) Is there any improper heat radiation? No Is outdoor fan motor operating? Yes Is the compressor OL connector connection normal? Yes No No - Reinstall the outdoor unit - Remove the obstacle(s) - Clean the outdoor heat exchanger Replace the outdoor fan motor. - Connector poor contact - Correct the connection Yes -DefectinIPM - Replace the outdoor unit PCB 75

76 5.2.2 F97 (Compressor Overheating Protection) Malfunction Decision Conditions During operation of cooling and heating, when compressor discharge pipe temperature data ( C (248 F)) is detected by the compressor discharge pipe temperature sensor. Malfunction Caused Refrigerant shortage (refrigerant leakage). 2/3 way valve closed. Detection error due to faulty compressor discharge pipe temperature sensor. Abnormality Judgment: 3 times happen within minutes. Troubleshooting For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component. Check the compressor discharge pipe temperature sensor. Does it conform to the sensor characteristic chart? Yes 2/3 way valve closed? No No Yes Replace the compressor discharge pipe temperature sensor. Open the 2/3 way valve Capillary tube or dryer clogged? No Charge for a specified amount of fresh refrigerant. Yes Replace the capillary tube or dryer. Check for gas leakage. Refrigeration cycle abnormality error again? Yes - Replace outdoor unit PCB - Compressor Oil oozing out from the 2/3 way valve? Yes Repairthepipeflareor union nuts. Reclaim and recharge refrigerant. No Procedure complete No 76

77 F98 ( Running Current Protection) Malfunction Decision Conditions During operation of cooling and heating, when an input over-current (.0A) is detected by checking the input current value being detected by current transformer (CT) with the compressor running. Malfunction Caused Over-current due to compressor failure. Over-current due to defective outdoor unit PCB. Over-current due to defective inverter main circuit electrolytic capacitor. Over-current due to excessive refrigerant. Abnormality Judgment: 3 times happen within minutes. Troubleshooting Get restarted and measure the input current. For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component. current > 6.8A? No Replace the outdoor unit PCB. Keep the tester in the resistance measuring range. Yes Turn off power supply. Check the main circuit electrolytic capacitor. Normal? Yes No Replace the outdoor unit PCB. hen the pointer swings, it means the capacitor functions. If the pointer does not swing at all, or if it swings all the way but does not return, it means the capacitor malfunction. (O0367) Check refrigerant amount. Excess refrigerant? Yes Reclaim and recharge with correct amount of refrigerant. No Replace outdoor unit PCB. 77

78 F99 (Outdoor Direct Current (DC) Peak Protection) Malfunction Decision Conditions During operation of cooling and heating, when an output over-current is detected by checking the current that flows in the inverter DC Peak sensing circuitry. Malfunction Caused DC peak due to compressor failure. DC peak due to defective power transistor(s). DC peak due to defective outdoor unit PCB. Abnormality Judgment: Continuous happen for 7 times. Troubleshooting Get restarted and measure the input current. For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component. current > 8.5A? Yes Is the refrigerant over charged? No No Yes Replace the outdoor unit PCB. Remove excess gas Check the compressor winding resistance: - Turn off the power and disconnect the harnesses U, V, and - Measure the winding resistance between U-V, V-, and -U Are the compressor s winding resistance (U-V, V-, or U-) shorted? Checking the power transistor Never touch any live parts for at least 0 minutes after turning off the circuit breaker. If unavoidably necessary to touch a live part, make sure the power transistor s supply voltage is below V using the tester. For the UV, make measurements at the Faston terminal on the board or the relay connector. No Yes - Compressor defective due to winding shorted - Replace compressor - Outdoor electronic circuit defect due to power transistor short - Replace the outdoor unit PCB Tester s negative terminal transistor (+) UV transistor (-) UV Tester s positive terminal UV transistor (+) UV transistor (-) Normal resistance Several kω to several MΩ Abnormal resistance 0 or 78

79 6. Disassembly and Assembly Instructions ARNING High voltages are generated in the electrical parts area by the capacitor. Ensure that the capacitor has discharged sufficiently before proceeding with repair work. Failure to heed this caution may result in electric shocks. 6. Outdoor Unit Removal Procedure (CU-3E9RBU) Caution! hen handling electronic controller, be careful of electrostatic discharge. 6.. Removing the Cabinet Top Plate and Cabinet Front Plate. Remove the cabinet top plate (remove the 8 screws). 2. Remove the 8 screws ( on the center, 3 at the top and 4 at the bottom) securing the cabinet front plate, release the 2 hooks ( each at the left and right), and pull the cabinet front plate toward front side. Tabs 6..2 Remove the Control Board Cover and Particular Plates 3. Remove the control board cover (remove 3 screws). 4. Remove the particular plate (remove 2 screws). 5. Remove the particular plate (remove 2 screws)

80 6..3 Removing the Control P.C. Board 6. Remove the drip proof cover. 7. Disconnect the connectors (lead wires of the compressor, sensor, and others). 8. Remove the screw at the right side of the control box, and pull out the entire control box. 9. Release the control P.C. Board tab to remove the control P.C. Board Removing the Propeller Fan and Fan Motor. Follow the steps in 6.. for removing the cabinet top plate and cabinet front plate. 2. Remove the propeller fan by removing the nut turning clockwise at its center Disconnect the fan motor connector from the control P.C. Board. 4. Loosen the 4 fan motor mounting screws then remove the fan motor. 4

81 6.2 Outdoor Unit Removal Procedure (CU-4E24RBU) Caution! hen handling electronic controller, be careful of electrostatic discharge Removing the Cabinet Top Plate. Remove the cabinet top plate (remove the screws). Fig Remove the Control Board Cover and Particular Plates 2. Remove the control board cover (remove the 5 screws). 2 Fig Remove the particular plate (remove the 3 screws). 3 Fig. 3 8

82 4. Remove the particular plate (remove the 8 screws). 4 Fig Removing the Cabinet Front Plate 5. Remove the cabinet front plate (remove the 7 screws). 5 Fig Removing the Control P.C. Board 6. Remove the cover by release the screw. 6 Fig. 6 82

83 7. Disconnect the connectors (lead wires of the compressor, sensors, and others). 8. Release the Control P.C. Board tab to remove the Control P.C. Board. 8 7 Fig Removing the Propeller Fan and Fan Motor 9. Remove the propeller fan by removing the nut turning clockwise as its center. 0. Disconnect the fan motor connector from the Control P.C. Board. Loosen the 4 fan motor mounting screws then remove the fan motor. 9 0 Fig. 8 83