COMMERICAL SPLIT SYSTEM KITS AND ACCESSORIES /2014 Supersedes 8/2012

Transcription

1 COMMERICAL SPLIT SYSTEM KITS AND ACCESSORIES /2014 Supersedes 8/2012 Litho U.S.A. MSAV Supply Air Blower VFD Kit INSTALLATION INSTRUCTIONS FOR MSAV (MULTI-STAGE AIR VOLUME) SUPPLY AIR BLOWER VFD KIT USED WITH TAA SERIES UNITS WARNING Improper installation, adjustment, alteration, service or maintenance can cause personal injury, loss of life, or damage to property. Installation and service must be performed by a licensed professional installer (or equivalent) or a service agency. CAUTION Physical contact with metal edges and corners while applying excessive force or rapid motion can result in personal injury. Be aware of, and use caution when working near these areas during installation or while servicing this equipment. Shipping and Packing List Check parts for shipping damage; if any damage is found, immediately contact the last shipping carrier. All parts are shipped inside the VFD sheet metal box. Please remove all packaging prior to installation and locate all parts listed below. Package 1 of 1 contains the following: 1 - Mounting bracket, long 1 - Mounting bracket, short 2 - Mounting brackets, 90º, long 2 - Mounting brackets, 90º, short 1 - Economizer control harness (only used with economizer) 1 - Bag assembly that consists of the following: 1 - Adapter harness, splice connector, and 8 single wire 1-24V conversion harness (only used on units without 24VAC terminal on TB1) 6 - Large wire nuts 3 - Small wire nuts 6 - Screws 5 - Wire ties 1-1/4 diameter metal plug 1 - Wiring diagram ( ) 1 - Wiring diagram ( ) used on units with the 24VAC terminal on TB Wiring diagram ( ) used on units without the 24VAC terminal on TB1. Application WARNING Electric Shock Hazard. Can cause injury or death. Line voltage is present at all components on units with single pole contactors, even when unit is not in operation! Unit may have multiple power supplies. Disconnect all remote electric power supplies before opening access panel. Unit must be grounded in accordance with national and local codes. An externally mounted enclosure houses a variable frequency drive (VFD) and a control that stages the supply air blower airflow. Designed for use on dual-stage split systems ranging from 7.5 to 20 ton capacity (TAA090 TAA240). The VFD alters the frequency and voltage of the power supply to control blower motor speed and airflow. Split dual-stage systems equipped with this option comply with California Code of Regulations Title 24 and ASHRAE Section requirements for staged indoor airflow. NOTE - The VFD has an operational range of -40ºF to 125ºF ambient air temperature. Attic temperatures may exceed the 125ºF operating range. If the air handler is installed in an attic the MSAV kit must be mounted remotely away from the air handler in a location where the maximum operating temperature range is not exceeded. After the MSAV kit is installed, the supply air blower has two speeds: 1. Low speed for part-load cooling operation. NOTE - Low speed is 66% of high speed. 2. High speed for full load cooling and all heat modes. Full speed blower operation is set by adjusting the motor pulley to deliver the desired air volume as with a conventional CAV system. The ventilation speed is selectable between high and low speed. NOTE - Part load airflow in cooling mode on MSAV units should not be set below 220 cfm/nominal full load ton to reduce the risk of evaporator coil freeze-up. Lower operating costs are obtained when the blower is operated on lower speeds. 03/14 Page

2 Dimensions and Weights TOP VIEW VFD MOUNTING BOX 7 1/4 (184) 17 1/2 (445) 13 7/8 (352) SIDE VIEW FRONT VIEW Figure 1. Dimensions Table 1. Weights Motor Size Voltage Model Information Cat # Approx. Weight (lbs.) 208/240V-3ph T2MSAV20LM1Y 92W HP 3HP 460V-3ph T2MSAV20LM1G 92W V-3ph T2MSAV20LM1J 92W /240V-3ph T2MSAV20LN1Y 92W V-3ph T2MSAV20LN1G 92W V-3ph T2MSAV20LN1J 92W HP 208/240V-3ph T2MSAV20MN1Y 92W HP 460V-3ph T2MSAV20MN1G 92W V-3ph T2MSAV20MN1J 92W /240V-3ph T2MSAV20N-1Y 92W V-3ph T2MSAV20N-1G 92W V-3ph T2MSAV20N-1J 92W74 28 Page 2

3 Installation MOUNTING AND WIRE ROUTING There are several possible mounting locations based on your application and installation requirement. The VFD mounting box is configured for the most used configuration (wires exiting left), but can be reconfigured so that wires exit to the right, if needed. The four most common mounting locations are outlined below. If another location is desired, please be sure there is enough wire length to reach the TAA control panel and that the chosen mounting location does not interfere with servicing the unit. 1. Mounting Option 1, Horizontal Applications Preparation: Attach the two (2) short 90 º brackets to the box as shown Remove the three (3) top and three (3) bottom screws that mount the wrapper to the side Add the brackets so they are flush with the left side of the box, and fasten brackets and wrapper using the same screws that were removed in step Mounting Option 2, Upflow Applications Preparation: Attach the one (1) short 90 º bracket and one (1) short flat bracket to the box as shown Remove the three (3) top and three (3) bottom screws that mount the wrapper to the side Add the brackets so that the bottom 90 o bracket is flush with the left side of the box. The top flat bracket extends out. Fasten brackets and wrapper using the same screws that were removed in step 2.1. SHORT FLAT BRACKET SHORT 90 º BRACKETS MOUNTED FLUSH Figure 4. Upflow Mounting Mount box to the TAA blower coil in location shown using the (6) sheet metal screws provided in kit. TAA CONTROL BOX SHORT 90 º BRACKETS MOUNTED FLUSH VFD MOUNTING BOX Figure 2. Horizontal Mounting Mount box to the TAA blower coil in location shown using the (6) sheet metal screws provided in kit. Figure 5. Mounting VFD Box - Upflow TAA CONTROL BOX VFD MOUNTING BOX Figure 3. Mounting VFD Box - Horizontal Page 3

4 3. Mounting Option 3, Upflow Applications Preparation: Attach the one (1) long 90 º bracket and one (1) long bracket to the box as shown Remove the three (3) top and three (3) bottom screws that mount the wrapper to the rear of the box Add the brackets so that the 90 º bracket is on the bottom of the box. Both, the top flat bracket and the bottom bracket extend out. Fasten brackets and wrapper using the same screws that were removed in step 3.1. LONG FLAT BRACKET LONG FLAT BRACKET LONG 90 º BRACKETS MOUNTED FLUSH Figure 8. Upflow Mounting (Surface Mount) Mount box to the TAA blower coil in location shown using the (6) sheet metal screws provided in kit. TAA CONTROL BOX VFD MOUNTING BOX LONG 90 º BRACKETS MOUNTED FLUSH Figure 6. Upflow Mounting (Surface Mount) Mount box to the TAA blower coil in location shown using the (6) sheet metal screws provided in kit. TAA CONTROL BOX VFD MOUNTING BOX Figure 7. Mounting VFD Box - Upflow (Surface Mount) 4. Mounting Option 4, Upflow Applications with Alternate Control Panel Location Preparation: Attach the one (1) long 90 º bracket and one (1) flat long bracket to the box as shown Remove the three (3) top and three (3) bottom screws that mount the wrapper to the rear of the box Add the brackets so that the 90 º bracket is on the bottom of the box. Both, the top flat bracket and the bottom bracket extend out. Fasten brackets and wrapper using the same screws that were removed in step 4.1. Figure 9. Mounting VFD Box - Upflow (Surface Mount - Alternate Location) ELECTRICAL CONNECTIONS Wire Routing: Wiring must conform to the current National Electric Code ANSI/NFPA No. 70, or Canadian Electric Code Part I, CSA Standard C22.1, and local building codes. Separate openings (knock-outs) have been provided for the 24V low voltage control wires, the line voltage wires to the box, and the load voltage wires from the box back to the blower. Refer to the dimension illustration for specific location All wires are hot stamped for identification and are approx. 8 feet long exiting the VFD mounting box. Route wires to the TAA control box. Route the 24V low voltage control wires, the line voltage wires to the box, and the load voltage wires from the box back to the blower in three (3) separate metal conduits. Use metal conduit since it will be serving as the grounding means between the VFD mounting box and the unit. NOTE: When an economizer is used, please refer to page 6 and route the 2-wire economizer harness before you route the VFD control wires. The 2-wire economizer harness has quick connect terminals and may be hard to pull through the conduit if not done first. Do not trim economizer wire harness! Leave enough length to make the connections and trim excess wires. Page 4

5 Low Voltage Connections Before proceeding it must be determined whether there is a 24VAC terminal on the TB1 terminal board (see figure10 for location if present). There are two electrical installation sections, one for units with a TB1 24VAC terminal and one without. TB1 WITH OR WITHOUT 24VAC TERMINAL K220 RELAY MOUNTING LOCATION BLOWER RELAY (K43) H1H2 G C W1 W2 C1 C2 R OCY1 Y2 K3 CONTROL PANEL Figure 10. Typical TAA Control Panel 5. Low Voltage Connections Units with 24VAC Terminal: Figure 11. Low Voltage Connections Units with 24VAC Terminal 5.1. Disconnect all power to unit Locate pink wires marked KIT-1 and KIT-2 (Quick connect) in the TAA control box and disconnect from each other Make wiring connections according to figure In the low voltage wire bundle coming from the VFD mounting box, find three wires marked K3-A, KIT-1, KIT-2 and strip ends Take the short adapter harness shipped with the kit marked K3-A, KIT-1, KIT-2, strip ends and using the three small wire nuts, connect to the wires mentioned in step 5.1. Secure wire nut connections with electrical tape (Field supplied) Connect the kit harness wire marked K3-A to the K3 blower contactor terminal A Connect the kit harness wire marked KIT-1 to the factory wire marked KIT Connect the kit harness wire marked KIT-2 to the factory wire marked KIT Connect remaining low voltage wires to the terminal block TB1 as shown in figure 11 and as per wire marking. Replace existing wiring diagrams on TAA unit with diagrams provided in kit. * Use if TB1 has the 24VAC terminal. * Use if TB1 does not have the 24VAC terminal. 6. Low Voltage Connections Units without 24VAC Terminal Older units that are not equipped with a 24VAC terminal on the TB1 terminal board require the addition of a harness in order to connect the accessory kit. In addition to the new harness a change to the 24VAC power supply wiring connection must be made. Use the following procedure and figure 12 to make the necessary changes Disconnect all power to unit Adding the Accessory Connection Harness Remove the TB1 terminal board and disconnect the pink wire attached to the R terminal on the rear side of the terminal board. Once wire has been removed, connect it to the splice connector provided in kit. Connect the single pink wire provided in kit to the other end of the splice connector Connect the 24VAC power supply wire coming from the outdoor unit to the pink wire that was just added to the one side of the splice connector using wire nut provided in kit. Secure wire nut connection with electrical tape (field-provided). Page 5

6 Disconnect the factory wire marked K43-5 from the K43 relay and connect to the short kit harness wire marked K Connect the other short kit harness wires marked K43-5 to the K43 relay Connect the short kit harness wire marked TB1-R to the TB1 terminal board Re-attach the TB1 terminal board to the control panel Refer to the procedures listed under Low Voltage Connections - Units with 24VAC Terminal, section 5 to continue the installation process. ROUTE WIRES MARKED P AND P1 TO THE ECONOMIZER CONTROL AND CONNECT THEM TO THE P AND P1 TERMINALS Figure 12. Units without TB1 24VAC Terminal 7. Units with Standard Economizer 7.1. This kit includes a 2-wire, 20-feet economizer harness needed to connect the VFD control board (A183) with the economizer enthalpy controller (A6) Connect the plug of the harness to the VFD board by inserting it into the open 2-position slot of the VFD control board. Make sure the wire marking of the harness wires (P, P1) is aligned with the board marking (P, P1). The plug is keyed to only fit into slot one way Route the 2-wire economizer harness with the other low voltage wires to the TAA control panel. From there route the harness to the economizer. Route alongside the harness that is coming from the economizer to the TAA control panel Remove the jumper between P and P1 terminals on the economizer enthalpy controller A6. See figure Connect the P and P1 wires to the P and P1 terminal on A6 respectively Adjust the minimum position potentiometer (MIN POS) on A6 to fully open (completely clockwise) and cover hole with the.25 dia. plug provided in kit. Figure 13. A6 Enthalpy Control 8. High Voltage Connections If you install the VFD kit as an add on installation and the TAA blower coil unit has been wired, please disconnect the line voltage wires and the blower motor wires from the K3 blower contactor. Rewire the line voltage wires to the high voltage wires going to the VFD marked A96-R,S,T. Rewire the blower motor wires to the high voltage wires coming from the VFD marked A96-U,V,W using the large wire nuts provided in kit as shown below. If this is a new install, please connect the incoming line voltage wires to the high voltage wires going to the VFD marked A96-R,S,T. Disconnect the blower motor wires and rewire to the high voltage wires coming from the VFD marked A96-U,V,W using the large wire nuts provided in kit as shown below. Figure 14. High Voltage Connections Page 6

7 MSAV Start-Up IMPORTANT! The MSAV supply air blower VFD kit is factory-set to run the blower at full speed when there is a blower (G) demand without a heating or cooling demand. SET MAXIMUM BLOWER CFM Use the following procedure to adjust the motor pulley to deliver the full load cooling or heating CFM. 1 RUN THE BLOWER WITHOUT A COOLING DEMAND. 2 MEASURE THE STATIC PRESSURE EXTERNAL TO THE UNIT. 3 MEASURE THE INDOOR BLOWER MOTOR'S RPM. FIXED PULLEY 4 USE THE STATIC PRESSURE AND REV/MIN READINGS TO DETERMINE THE UNIT'S AIR VOLUME (SEE APPLICABLE BLOWER PERFORMANCE TABLES). 5 LOOSEN THE ALLEN SCREW ON THE ADJUSTABLE PULLEY. 6 TURN THE ADJUSTABLE SHEAVE CLOCKWISE TO INCREASE THE AIR VOLUME OR COUNTERCLOCKWISE TO DECREASE THE AIR VOLUME. BLOWER BELT ADJUSTABLE PULLEY 7 ONCE THE DESIRED AIR VOLUME HAS BEEN ACHIEVED, TIGHTEN THE ALLEN SCREW. NOTE THE INDOOR COIL MUST BE DRY AND THE AIR FILTERS MUST BE IN PLACE WHEN THE FOLLOWING MEASUREMENTS ARE TAKEN. ADJUSTABLE PULLEY ALLEN SCREW Figure 15. Typical Air Volume Adjustment Procedure 1 PLACE BELT OVER ALL THREE PULLEYS. BELT TENSIONER 2 USING A 15/16 WRENCH ON THE TENSIONER BODY NUT, APPLY FORCE UNTIL MARKS ALIGN AS SHOWN. WHILE HOLDING THE TENSIONER IN THIS POSITION, TIGHTEN THE MOUNTING BOLT TO 23 FT-LBS USING A 9/16 WRENCH. 3 Figure 16. Typical Blower Belt Tensioner Adjustment Procedure Page 7

8 MSAV Sequence of Operation 1. Ventilation speed is determined by the VENT SPEED switch setting on VFD control board (LO or HI). 2. Blower operates in low speed for mechanical cooling (Y1). 3. Blower operates in high speed for any other mode (free cooling, mechanical cooling Y1+Y2, and heating). 4. Economizer damper minimum position is fully closed in unoccupied mode. In occupied mode, the economizer damper minimum position is determined by the setting of the two potentiometers on VFD control board LO SPD MIN POS potentiometer sets the minimum position when blower is operating at low speed HI SPD MIN POS potentiometer sets the minimum position when blower is operating at high speed. Units With An Optional Economizer 1. Set thermostat to occupied mode if the feature available. Make sure a jumper is in place between TB1 terminals R and OC when using a thermostat which does not have this feature. See figure 18. TB1 SET BLOWER SPEED DURING VENTILATION To save energy during ventilation, the blower speed can be set to low. This is accomplished by changing the ventilation speed switch on the VFD control board to LO. See figure 17. The following sections describe how to set the economizer minimum damper positions only. For other information please refer to the economizer instructions included with the economizer. STANDARD ECONOMIZER MINIMUM POSITION SETTINGS Note - AFTER setting minimum positions, set the VENT SPEED" switch on the VFD control board to the desired speed. See figure 17. VENTILATION SPEED SWITCH POWER LED LOW SPEED MINIMUM POSITION POTENTIOMETER HIGH SPEED MINIMUM POSITION POTENTIOMETER Figure 17. VFD Control Board Page 8 Figure 18. VFD Control Board 2. Minimum damper position setting - Low Speed. Switch the Vent Speed" switch on the VFD control board to LO". 3. Turn on the indoor blower using the thermostat or by placing a jumper between TB1 terminals R and G. The inverter or variable frequency drive (VFD) should display 40.00Hz". 4. Adjust the low speed minimum position potentiometer on the VFD control board to the approximate setting. See chart Measure outdoor air temperature. Mark the point on the bottom line of chart 1 and label the point A" (40 F, 4 C shown). 6. Measure return air temperature. Mark that point on the top line of chart 1 and label the point B" (74 F, 23 C shown). 7. Measure mixed air (outdoor and return air) temperature. Mark that point on the top line of chart 1 and label point C" (70 F, 21 C shown). 8. Draw a straight line between points A and B. 9. Draw a vertical line through point C. 10. Draw a horizontal line where the two lines meet. Read the percent of fresh air intake on the side. 11. Repeat steps 4 through 10 until calculation reads desired fresh air percentage. If fresh air percentage is less than desired, adjust MIN POS SET potentiometer clockwise (further open). If fresh air percentage is more than desired, adjust MIN POS SET potentiometer counterclockwise (less open). 12. Minimum damper position setting - High Speed. Switch the Vent Speed" switch on the VFD control board to HI". The VFD should display 60.00HZ". 13. Adjust the high speed minimum position potentiometer on the VFD control board to the approximate setting. See chart 1.

9 14. Measure outdoor air temperature. Mark the point on the bottom line of chart 1 and label the point A" (40 F4 C shown). 15. Measure return air temperature. Mark that point on the top line of chart 1 and label the point B" (74 F, 23 C shown). 16. Measure mixed air (outdoor and return air) temperature. Mark that point on the top line of chart and label point C" (70 F, 21 C shown) Draw a straight line between points A and B. 18. Draw a vertical line through point C. 19. Draw a horizontal line where the two lines meet. Read the percent of fresh air intake on the side. 20. Repeat steps 13 through 19 until calculation reads desired fresh air percentage. If fresh air percentage is less than desired, adjust MIN POS SET potentiometer clockwise (further open). If fresh air percentage is more than desired, adjust MIN POS SET potentiometer counterclockwise (less open). 21. AFTER setting both minimum positions, set the VENT SPEED" switch on the VFD control board to the desired speed. See figure 17. F C CHART 1 CALCULATE MINIMUM FRESH AIR PERCENTAGE MIXED AND RETURN AIR TEMPERATURE C B F C F -20 C A OUTDOOR AIR TEMPERATURE F C HIGH PERFORMANCE ECONOMIZER MINIMUM POSITION SETTINGS Note - AFTER setting minimum positions, set the VENT SPEED switch on the VFD control board to LO. See figure 19. Minimum position potentiometers do not function when the unit is equipped with a W7220 economizer control. 1. Set thermostat to occupied mode if the feature is available. Make sure a jumper is in place between TB1 terminals R and OC when using a thermostat which does not have this feature. 2. Minimum damper position setting - Low Speed Switch the blower speed setting on the VFD control board to LO. 3. Turn on the indoor blower using the thermostat or by placing a jumper between TB1 terminals R and G. The inverter or variable frequency drive (VFD) should display 40.00Hz. 4. Navigate to the SETPOINTS menu and select MIN POS L. Adjust value (2-10VDC) to the approximate desired fresh air percentage and save the input. 3.0 VDC 12% Open Damper 3.5 VDC 18% Open Damper 4.0 VDC 25% Open Damper 4.5 VDC 31% Open Damper 5.0 VDC 37% Open Damper 5.5 VDC 43% Open Damper 6.0 VDC 50% Open Damper Note - Damper minimum position can be set lower than traditional minimum air requirements when an IAQ sensor is specified. 5. Navigate to the CHECKOUT menu and select VMAX-LS. Press. 6. Display will read DAMPER VMAX-LS RUN?. Press. Page 9

10 LVC2 (A183) VFD CONTROL BOARD VENTILATION SPEED SWITCH 3.0 VDC 12% Open Damper 3.5 VDC 18% Open Damper 4.0 VDC 25% Open Damper 4.5 VDC 31% Open Damper 5.0 VDC 37% Open Damper POWER LED LOW SPEED MINIMUM POSITION POTENTIOMETER HIGH SPEED MINIMUM POSITION POTENTIOMETER FIGURE Damper will drive to the setpoint value stored in step Measure outdoor air temperature. Mark the point on the bottom line of chart 1 and label the point A (40 F, 4 C shown). 9. Measure return air temperature. Mark that point on the top line of chart 1 and label the point B (74 F, 23 C shown). 10. Measure mixed air (outdoor and return air) temperature. Mark that point on the top line of chart 1 and label point C (70 F, 21 C shown). 11. Draw a straight line between points A and B. 12. Draw a vertical line through point C. 13. Draw a horizontal line where the two lines meet. Read the percent of fresh air intake on the side. 14. Repeat steps 4 through 13 until calculation reads desired fresh air percentage. If fresh air percentage is less than desired, use the A6 keypad to adjust MIN POS L values higher (further open). If fresh air percentage is more than desired, adjust MIN POS L values lower (less open). 15. Minimum damper position setting - High Speed Switch the blower speed setting on the VFD control board to HI. The VFD should display 60.00HZ. 16. Navigate to the SETPOINTS menu and select MIN POS H. Adjust value (2-10VDC) to the approximate desired fresh air percentage. 5.5 VDC 43% Open Damper 6.0 VDC 50% Open Damper Note - Damper minimum position can be set lower than traditional minimum air requirements when an IAQ sensor is specified. 17. Navigate to the CHECKOUT menu and select VMAX-HS. Press. 18. Display will read DAMPER VMAX-HS RUN?. Press. 19. Damper will drive to the setpoint value stored in step Measure outdoor air temperature. Mark the point on the bottom line of chart 1 and label the point A (40 F, 4 C shown). 21. Measure return air temperature. Mark that point on the top line of chart 1 and label the point B (74 F, 23 C shown). 22. Measure mixed air (outdoor and return air) temperature. Mark that point on the top line of chart 1 and label point C (70 F, 21 C shown). 23. Draw a straight line between points A and B. 24. Draw a vertical line through point C. 25. Draw a horizontal line where the two lines meet. Read the percent of fresh air intake on the side. 26. Repeat steps 16 through 25 until calculation reads desired fresh air percentage. If fresh air percentage is less than desired, use the A6 keypad to adjust MIN POS H values higher (further open). If fresh air percentage is more than desired, adjust MIN POS H values lower (less open). 27. Set the VENT SPEED switch on the VFD control board to LO. DEMAND CONTROL VENTILATION (DCV) When a 2 10VDC CO 2 sensor is wired to the controller (leads provided), the DCV SET, VENT MIN, and VENT MAX parameters will appear under SETPOINTS menu. Navigate to the SETPOINTS menu to adjust setpoints as desired. Refer to the Honeywell manual provided for more details. Page 10

11 High Performance Economizer - Sequence of Operation Refer to tables 2 or 3. When the outdoor air is suitable and a thermostat demand calls for 1 st. stage cooling (Y1), the economizer will modulate the dampers between the minimum and fully open positions to maintain a 55 F (12.8 C) mixed air temperature. When there is an increased thermostat demand for second stage cooling (Y2), the economizer damper opens 100% and the economizer controller (A6) will bring on the compressor. At that point, K8 relay will switch from the R1 mixed air sensor to R51 resistor allowing the economizer damper to stay open 100%. The damper will stay open 100% with the compressor running simultaneously until Y2 demand is met. NOTE Because of the sensor location, the mixed air temperature displayed on the economizer controller (A6) is only true when no mechanical cooling or heating is initiated. During mechanical cooling (compressor running), the MA temperature displayed will be the temperature equivalent of the fixed resistor and not the actual MA temperature. TROUBLESHOOTING, ALARMS AND CHECKOUT TESTS Refer to the Honeywell manual provided for details. TABLE 2 ECONOMIZER OPERATION - NO DCV (CO 2 SENSOR, 2-SPEED SUPPLY FAN) OA Good to Y1-IÑ Y2-I Fan Y1-O Y2-O Occupied Economize? Speed ÑÑÑ DCV ÑÑ Unoccupied Ñ ÑÑ Off Off Low 0-v/Off 0-v/Off MIN POS L Closed ÑÑÑ ÑÑ None No ÑÑ On Off Low 24-v/On 0-v/Off MIN POS L Closed ÑÑÑ ÑÑÑ ÑÑÑ On On High 24-v/On 24-v/On MIN POS H Closed ÑÑ Ñ Off Off Low 0-v/Off 0-v/Off MIN POS L Closed ÑÑÑ ÑÑÑ ÑÑÑ ÑÑÑ None On Off High 0-v/Off 0-v/Off MIN POS L to Full-Open Closed to Full-Open Yes ÑÑ Delay (b) Ñ On Ñ On High 0-v/Off Full-Open ÑÑÑ Full-Open 24-v/On (b) With 2SP FAN DELAY (Advance Setup Menu), when in the economizing mode, there is a delay for the high speed fan to try to satisfy the call for second-stage cooling by turning on the fan to high and opening the OA dampers to 100% before the first-stage mechanical cooling is enabled. TABLE 3 ECONOMIZER OPERATION - WITH DCV (CO 2 SENSOR, 2-SPEED SUPPLY FAN) ÑÑÑ Ñ OA Good to ÑÑÑ DCV ÑÑÑ Economize? ÑÑÑ Y1-I Fan ÑÑÑ Y2-I Y1-O Y2-O Occupied Unoccupied SpeedÑ Ñ Off Off Low 0-v/Off 0-v/Off Ñ VENTMIN L Closed ÑÑÑ No On Off Low 24-v/On 0-v/Off Ñ VENTMIN L ÑÑÑ Closed ÑÑÑ BelowÑÑÑ On On High 24-v/On 24-v/On Ñ VENTMIN H ÑÑÑ Closed ÑÑÑ set ÑÑÑ Off Off Low 0-v/Off 0-v/Off Ñ VENTMIN L ÑÑÑ Closed ÑÑÑ Yes ÑÑÑ On Off High 0-v/Off 0-v/Off Ñ VENTMIN L to Full-Open ÑÑÑ Closed to Full-Open Ñ On On High Delay (b) 0-v/Off Ñ Full-Open ÑÑÑ Full-Open 24-v/On Ñ Off ÑÑÑ ÑÑ Off Low 0-v/Off 0-v/Off VENTMIN L to VENTMAX L Closed ÑÑÑ No On ÑÑÑ ÑÑ Off Low 24-v/On 0-v/Off VENTMIN L to VENTMAX L Closed ÑÑÑ On ÑÑÑ ÑÑ On High 24-v/On 24-v/On VENTMIN H to VENTMAX H Closed AboveÑÑÑ set Off ÑÑÑ ÑÑ Off Low 0-v/Off 0-v/Off VENTMIN L to VENTMAX L Closed ÑÑÑ On ÑÑ Off High 0-v/Off 0-v/Off VENTMIN L to Full-Open Closed to Full-Open ÑÑÑ Yes Ñ Ñ On Delay (b) On High 24-v/On 0-v/Off Ñ Full-Open ÑÑÑ Full-Open (b) With 2SP FAN DELAY (Advance Setup Menu), when in the economizing mode, there is a delay for the high speed fan to try to satisfy the call for second-stage cooling by turning on the fan to high and opening the OA dampers to 100% before the first-stage mechanical cooling is enabled. Page 11

12 Blower Performance TA 090 BLOWER PERFORMANCE Air Volume cfm STATIC PRESSURE EXTERNAL TO UNIT - Inches Water Gauge RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP Air STATIC PRESSURE EXTERNAL TO UNIT - Inches Water Gauge Volume cfm RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP Page 12

13 TA 120 BLOWER PERFORMANCE Air STATIC PRESSURE EXTERNAL TO UNIT - Inches Water Gauge Volume cfm RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP Air STATIC PRESSURE EXTERNAL TO UNIT - Inches Water Gauge Volume cfm RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP Page 13

14 TA 150 BLOWER PERFORMANCE Air STATIC PRESSURE EXTERNAL TO UNIT - Inches Water Gauge Volume cfm RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP T Air STATIC PRESSURE EXTERNAL TO UNIT - Inches Water Gauge Volume cfm RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP Page 14

15 TA 180 BLOWER PERFORMANCE Air STATIC PRESSURE EXTERNAL TO UNIT - Inches Water Gauge Volume cfm RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP Air STATIC PRESSURE EXTERNAL TO UNIT - Inches Water Gauge Volume cfm RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP Page 15

16 TA 240 BLOWER PERFORMANCE Air Volume cfm STATIC PRESSURE EXTERNAL TO UNIT - Inches Water Gauge RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP Air Volume cfm STATIC PRESSURE EXTERNAL TO UNIT - Inches Water Gauge RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP Page 16

17 Wiring Diagrams Figure 20. TAA G, J, Y with VFD ID Blower (with 24VAC on TB1 Terminal) Page 17

18 Figure 21. TAA G, J, Y with VFD ID Blower (without 24VAC on TB1 Terminal) Page 18

19 Figure 22. Touch Screen Thermostat - TSA and TPA Units with VFD ID Blower Page 19

20 TROUBLESHOOT VFD CONTROL BOARD (A183) Refer to wiring diagrams located at the end of this instruction. 1. Inspect the VFD control board for damaged components. Replace the control board if damaged components are found. 2. Check all wire connections to VFD control board; secure if loose. 3. Check for 24VAC signal at the thermostat blower input (G to GND terminal). 24VDC VFD IN PUTS; H2 HEADER 24VAC THERMOSTAT INPUTS; H1 HEADER Figure 23. VFD Control Board Terminal Designations 4. If there is no thermostat signal, troubleshoot back toward the thermostat. 5. Check the power LED on the board. See figure If the power LED is not on, check voltage between VFD control board terminals PC (H2-1) and SD (H2-5). Voltage should read 24VDC. 7. If voltage does not read 24VDC, disconnect the H2 header from the VFD control board inputs terminal block (to make sure the VFD control board is not shorting 24VDC supply from the inverter). Measure the voltage between the end terminals on the H2 header. If 24VDC is present, replace the VFD control board. If no voltage is read, troubleshoot the VFD. 8. When VFD control board 24VAC thermostat blower (G) input and 24VDC power are present, check the VFD control board low and high speed outputs. The VFD control board uses inverse logic to enable the blower; 1VDC will be read at the enabled blower speed terminal. See table If all inputs are correct and the unit still does not operate as intended, replace VFD control board. Table 4. VFD Control Board Blower Output Output Terminals Voltage Blower Operation RL-SD 1VDC RH-SD 24VDC Low Speed RL-SD 24VDC RH-SD 1VDC High Speed RL-SD 1VDC Illegal State RH-SD 1VDC (replace board) RL-SD RH-SD 24VDC 24VDC Blower Off (replace board) Page 20