TROUBLESHOOTING GUIDE FOR HEAT PUMP BOOSTERS MODELS: HPB11, HPB15, & HPB22

Transcription

1 V3 TROUBLESHOOTING GUIDE FOR HEAT PUMP BOOSTERS MODELS: HPB11, HPB15, & HPB22

2 PREFACE This guide contains instructions for troubleshooting the Steffes Corporation room heating units: Models HPB 11, HPB 15, and HPB 22. In compiling this guide, Steffes Corporation has used its best judgment based upon information available but disclaims any responsibility or liability for any errors or miscalculations, contained herein, or any revisions, hereof, or which result, whole or in part, from the use of this guide, or any revision hereof. If there are any questions, contact Steffes Corporation technical support at STEFFES ( ) TABLE OF CONTENTS FLOW CHARTS Unit Will Not Charge (Unit Has No Core Charge) or Control Board Lights Are Off... 1 Unit Undercharges... 3 Unit Overcharges On Warm Days... 4 Cool Discharge Air... 5 Blower Does Not Run... 6 MISCELLANEOUS Discharge Air Check-Out Procedure Exploded View Diagram of Heat Pump Booster... 9 Heat Pump Booster Parts List

3 No Lights Heat Pump Booster Function: Core Charging Problem: Unit will not charge (Unit has no core charge) or Control Board lights are off. Before starting any of the procedures below, check voltage on load side of all HPB circuit breakers and check low voltage fuses on charge control circuit board. Place unit in off-peak mode. No Lights Check "Outdoor Temperature Sensor" lights on charge control circuit board. Check utility switch and HPB off-peak light on charge control circuit board for Check utility proper switch operation. and HPB off-peak light on charge control Lights circuit Operable board (51) for proper operation. One or more Check "Outdoor Temperature lights on Check "ETS CHARGING" Sensor" lights on charge Off indicator light on charge Jumper thermostat brown lead to control thermostat orange lead. (NOTE: Charge control light on Make sure thermostat shaft is in One or more full clockwise position.) lights on Charge light off Jumper thermostat (53) brown Replace charge control thermostat. lead to thermostat orange lead. Charge light on (NOTE: Replace Make charge sure thermostat control circuit board. shaft is in full clockwise position.) Off With charge control circuit board switches in "AUTO" and "WINTER" position: Replace outdoor air 1. Remove outdoor temperature sensor wire sensor. "G". Outdoor Held Shut temperature light #1 should be on. 2. Remove outdoor sensor wire "B". Outdoor temperature light indicator #2 should be Replace on. melt links and complete discharge air check-out procedure. Replace outdoor air temperature sensor (61). Check "ETS CHARGING" On indicator light on charge control circuit Lights board. Operable Lights Inoperable No Check for 24 VAC on orange On Present wire going to the top of the Check for defective staging sequencer Check (50). unit wiring charge sequencers or and/or replace defective heating charge No control elements. Present circuit board. Repair wiring. Opens Check slam Check gate in-line Freely fuse in assembly behind Open transformer the secondary Check units inlet/outlet Opens slam gate wiring. interlock ducting ports. Freelyswitch. Flow chart continued on next page. Lights Inoperable Check for 24 VAC between "C" terminal on SFIII board and on orange wire going to the top of the staging sequencer. Check for defective Check unit wiring charge Check sequencers for 24 VAC between and/or each replace of the two bottom low voltage fuses (58) or defective charge control and the "C" position (thermostat heating elements connection), (18). on charge circuit control board (51). Check outdoor temperature not circuit board's terminal block. Charge light off Replace thermostat (53). and refer to the Theory of present on one Above 45º Operation. or both Check for 24 Both VAC fuses Outdoor between each of the two bottom energized Temperature low voltage fuses and the "C" position (thermostat Below 45º Check line voltage supply connection), Replace on charge control Outdoor Set the charge level selector switch on to control transformer and Check outdoor temperature and not circuit board's terminal circuit board. Temperature the charge control circuit board to the unit wiring. block. "HIGH" position and retest. refer to the Theory of Operation present on one Above 45º in Appendix of the Owner's or both Both fuses Outdoor Manual. energized With charge control circuit board switches in Temperature Repair wiring. "AUTO" and "WINTER" position: Check line voltage supply to Set the charge level selector switch on 1. Remove outdoor Below 45º sensor wire "G". Outdoor control Check transformer in-line fuse in(55) and the charge control circuit board (51) Open temperature light Outdoor #1 should be on. Replace transformer unit secondary wiring. Temperature to the "HIGH" position and charge retest. control wiring if equipped. 2. Remove outdoor sensor wire "B". Outdoor circuit board. temperature light indicator #2 should be on. Good Look for a short circuit in low voltage wiring and replace transformer if necessary. Open Good Look for shorts in low Adjust or replace. voltage Check wiring secondary and replace. voltage (approximately 24 VAC) at the transformer. No Closed Proper voltage present Page 1 Page 1 Replace Transformer. Replace Charge Control Circuit Board.

4 Heat Pump Booster Function: Core Charging Problem: Unit undercharges Before starting any of the procedures below, check voltage on load side of all HPB circuit breakers. Check for 24 VAC between each of the 3-amp low voltage fuses and the "C" position (thermostat connection) on the charge control circuit board's terminal block. Unit undercharges on cold days Check charge control thermostat knob for proper position. Unit undercharges on warm days Check daily kwh usage. (See Unit Check Specifications daily kwh in Appendix usage. of (See the Unit Owner's Specifications.) Manual.) Proper Proper Maximum Maximum Usage Usage Check unit sizing. Less than Max usage Set the charge level selector switch on the charge control board (51) to the to "HIGH" the "HIGH" position. position. Check Check for for proper amperage draw on heating elements: (18): (Thiswill very slightly) HPB11B = 46 AMPS (240V systems) HPB15B = 61 AMPS (240V systems) HPB22B = 92 AMPS (240V systems) Less Less than than proper proper amperage amperage No Place the charge control circuit board switches in "WINTER" and "AUTO". Disconnect outdoor air sensor "W" wire. All Three Outdoor Temperature Lights On Check outdoor air temperature sensor in cold cold place (less (less than than15 degrees 15 F). F). All All mercury bulbs should open. All bulbs open thermostat. (53). Not All Outdoor Temperature Lights On With the charge level selector switch still in the "HIGH" position, check for zero voltage on charge control resistor from (49) both from the both center the center to bottom to bottom and the and center the center to top. top. All bulbs closed Replace outdoor air temperature sensor sensor. (61). circuit board. Check Check the outdoor the outdoor temperature lights lights on charge on charge control control circuit circuit board (51). board. All All three must be be on. on. Replace charge control circuit board (51). Open Replace sequencer(s). (58). Check for 24VAC on base terminals of all charging sequencers. (58). Check for contact closure on all charging sequencers. (58). Check heating elements elements and (18). replace as necessary. No Check unit wiring and/or replace charge control circuit board board. (51). Page 3 Page 2

5 Heat Pump Booster Function: Core Charging Problem: Unit overcharges on warm days Before starting any of the procedure below, check voltage on load side of all HPB circuit breaker and check low voltage fuses on charge control circuit board. Lights work properly Lights work properly Check operation of the three Check "Outdoor operation Temperature of the three All lights "ON" regardless of "Outdoor Sensor" lights Temperature on charge All lights outdoor "ON" temperature regardless of Sensor" control lights circuit on charge board. outdoor temperature control With wires disconnected, check With wires disconnected, check ohm values of the charge control ohm values of the charge control resistor. Must be 175 ohm center resistor (49). Must be 175 ohm to top and center to bottom. center to top and center to bottom. Check Check VAC unit on wiring resistor and (66) from middle to top and charge middle control to bottom. circuit Reults vary depending on board number fuses. of charging lights on: 1 light on = 24 VAC middle to top and bottom 2 lights on = 0 VAC middle to top; Repair 24 VAC middle to bottom 3 Replace lights on charge = 0 VAC control middle to top and bottom Incorrect Replace charge control thermostat. Check unit wiring and charge control circuit board fuses. Replace resistor (49). present Replace resistor. Fuse bad Check outdoor sensor Check wiring outdoor and Fuse bad replace sensor the wiring fuse. for short to ground and replace the fuse. If fuse continues to open, replace charge control circuit board. Check the charge level selector Check switch. the Unit charge should level not selector be in switch. "HIGH" Unit mode should on warm not be days. in "HIGH" mode on warm days. Check top (1 Check AMP) topfuse. (1 AMP) fuse. Fuse Fuse Check for 32 VDC between the "C" position (thermostat Check for connection) 32 VDC between on the charge the "C" control positioncircuit (thermostat board's terminal connection) block and on the charge top low control voltage circuit fuse on board's terminal the charge block and control the top circuit low board. voltage fuse on the charge control Check fuse. present Repair 1. With outdoor air temperature sensor wiring disconnected and the selector switches on the charge control circuit board set to "WINTER" and "AUTO" positions, jumper 1. With outdoor air temperature outdoor sensor wiring air sensor disconnected terminals "W" and the and selector "R". The switches on the charge control circuit bottom board Outdoor set to Temperature "WINTER" Sensor and "AUTO" light on positions, jumper outdoor air sensor charge terminals control "W" circuit and board "R". The should bottom be off. Outdoor Temperature Sensor light on charge control circuit board should be off. 2. Jumper "W", "R", and "B" terminals. The middle and bottom Outdoor Temperature 2. Jumper "W", "R", and "B" terminals. Sensor lights The middle on charge and control bottom circuit Outdoor board Temperature Sensor lights on charge should control go off. circuit board should go off. No voltage present No voltage present Replace charge control circuit board (51). Not Not Set to auto Set position. to auto position. Check control transformer(s) Check control and the transformer(s) two lower 3AMP (55) and fuses. the two lower 3AMP fuses. Replace fuse Replace and/or fuse transformer. and/or transformer (55). Replace charge Replace outdoor Replace air outdoor control circuit temperature sensor(61). air temperature board. sensor. Page 4 Page 3

6 Heat Pump Booster Function: Air Delivery Problem: Cool discharge air Before starting any of the procedure below, check voltage on load side of all HPB circuit breakers. Check for 24 VAC between each of the low voltage fuses the "C" position on the charge control circuit board's terminal block.. Cold Stage One Only Blower delivers cool discharge air. Cold All Stages Cold Stage One Blower delivers Uncertain cool Cold All Stages discharge air. Now Warm Iniate emergency Still Cold Does the charging system No/Uncertain heat call. work correctly? Refer to Does the charging the Theory system of Operation. work Initiate a Stage I heat call. correctly? Refer to the Theory of Not Make Initiate sure the a Stage duct sensor I heat call. is positioned Repair Operation in the Appendix of the Make properly sure the and duct check sensor field (52) wiring. is Not Owner's Manual. No Repair Refer to the appropriate core positioned properly and check field wiring. Yes Yes charging sections: Unit Undercharges Unit Overcharges Refer to the on appropriate Warm Days Unit Will core Not charging Charge sections (Unit has of no Damper doesn't Disconnect Disconnect the the red yellow wire from wire charge) this or troubleshooting Control Board guide. Lights Damper from the damper motor (22). With duct sensor (52) disconnected open the damper motor. Initiate a are Off doesn't heat Initiate call, a check heat call, voltage check at With interface duct board sensor (21), disconnected jumper theat open between voltage the between yellow the wire yellow and interface red and board, black terminal jumper the block 0 VAC red and wire the and red the wire. red wire. 0 VAC positions. black terminal Watch block for damper positions. to open. Watch for damper to open. 24 VAC 24 VAC Damper opens Are the sensors on the duct Damper opens Check voltage between 24 VAC Check voltage between sensor (52) and the air Replace duct 24 VAC the yellow the yellow wire and wire and discharge COLD ALL controller STAGES: (45) open. Are both of the sensor (52). the blue the wire. blue wire. Replace duct sensors on the air discharge controller open? No sensor. 0 VAC 0 VAC COLD STAGE Yes ONE ONLY: Are both of the Replace the interface sensors on the duct sensor open? Replace the interface board board. (21). Replace Replace the the damper Check unit Replace damper motor. motor (22). wiring. appropriate Yes No Correct sensors. Incorrect Correct Replace the interface board. Check unit Fix wiring. unit wiring. Incorrect Fix unit wiring. Replace the Replace interface air board discharge (21). controller or duct sensor. Page 5 Page 4

7 Heat Pump Booster Function: Air Delivery Problem: Blower does not run Before starting any of the procedure below, check voltage on load side of all HPB circuit breakers. Check for 24 VAC between each of the low voltage fuses and the "C" position on the charge controls circuit board's terminal block. Put heater into peak mode. Initiate a peak mode. Initiate a peak mode. present present Check for 24 VAC across "R" and "C" terminals on booster interface board (21). Check for 24 VAC across "R" and "C" terminals on booster interface board. No voltage No voltage Jumper terminal "R" to "W" on the interface board (21). Jumper terminal "R" to "W" on Motor the interface does not board. run Motor runs Motor runs Troubleshoot and repair field wiring. Troubleshoot and repair field wiring. Check for operation of fan relay (54). Check for operation of fan relay. Relay will not operate Check voltage at relay coil. Check voltage at relay coil. No voltage Replace interface board (21). Relay will not operate present No voltage Replace interface board. Motor does not run present Relay closes Relay closes Check supply voltage to core blower motor (38). Replace fan relay (54). Check field wiring and wall thermostat. Check supply voltage to core blower Improper motor. Improper Check unit wiring and fan limits (44 & 27). Check unit wiring and fan limits. Replace fan relay. Check field wiring and wall thermostat. Open Proper Proper Closed Replace core blower motor (38). Replace fan limit switch(es). Replace core blower motor. Check system wiring. Page 6 Page 5

8 CHECK OUT PROCEDURE: DISCHARGE AIR Check-Out Procedure Models: HPB11B, HPB15B and HPB22B The failure of the melt link is often the result of another problem that exists within the booster. Typically, the failure is a direct result of the inability of the booster to regulate its output temperature. If the primary problem is not rectified, melt link failure could occur again. Thus, after the failed melt link has been replaced, the booster MUST be tested to ensure that failure will not reoccur. 1. Check for proper connection of the remote mounted duct sensor, IF USED. CAUTION: Shorting of the duct sensor to the ductwork WILL cause a malfunction in the booster and result in the melt link failing. An inspection of the duct sensor mounting and clearance must be performed. 2. Remove the electrical panel cover on the front of the booster. 3. Disconnect blowers to test damper operation by removing the purple wire from the blower relay. Energize the booster s control circuit to observe the damper motor. 4. With no heat call to the booster, the damper motor should go to a fully closed (CW) position. (See Figure 1) Figure 1 5. Now, initiate a Stage 2 heat call from the booster s room thermostat. The damper motor should go to a fully open (CCW) position. (See Figure 2) 6. If the damper does not move to an opened and closed position as shown in Figures 1 and 2, check the damper system for mechanical binding and/or for CCW damper motor malfunction. 7. De-energize the control circuit and remove the RED damper motor wire from the CCW terminal. 8. Energize the control circuit again and initiate another heat call from the booster s CLOSED room thermostat. 9. Check voltage from the COM terminal and the now disconnected RED wire Figure 2 on the damper motor. 24 VAC should be present. Also, check the voltage between the COM and CW terminal. No voltage should be present. 10. Remove the air discharge sensor. Inspect the temperature sensing bulbs for separations or breaks in the mercury columns at the center of the bulbs. It may CCW be necessary to warm the bulbs to fully view the mercury columns. In many cases, if a separation exists, it can be removed by the heating of the sensor causing the mercury to move to the top of the bulb. CAUTION: Overheating the bulb can cause it to burst. SAFETY GLASSES MUST BE WORN WHEN HEATING THE BULBS. NOTE: Early booster models incorporated an air discharge sensor that signaled the booster s control system directly. Newer models use triac controls. If the booster that is being serviced does not have the triac switches on the air discharge sensor, it is recommended that the sensor be replaced. 11. De-energize the control circuit. Jumper between the upper and lower copper bulb mounting brackets of the 145 degree mercury bulb (inner bulb) on the air discharge sensor which is located in the base of the booster. 12. Energize the control circuit and check the status of the #4 LED Red light on the booster s interface board. This light must be energized (indicates the damper is satisfied). 13. Retest the voltage at the damper motor. (Refer to steps 7, 8 and 9.) If the booster does not respond correctly to the voltage check, replace the air discharge sensor. should be zero between the COM terminal and RED damper motor wire. It should also be zero between the COM terminal and the CW terminal. 14. De-energize the control circuit again. With the 145 degree sensing bulb jumper still in place on the air discharge sensor, jumper between the upper and lower copper bulb mounting brackets of the 160 degree sensing bulb (outer bulb). Page 6 OPEN CW CW

9 Discharge Air Check Out Procedure Continued 15. Energize the control circuit and check the #4 yellow LED light on the interface board. It should remain on (indicates the damper is satisfied), and there should be 24 VAC between the CW terminal and the COM terminal on the damper motor. 16. If any of the voltage tests performed in this check-out procedure do not yield the correct results, check connections from the booster s interface board to the air discharge sensor. 17. If all systems check-out, de-energize all circuits and reconnect all wires, remove all jumpers, and reassemble the booster by reversing the disassembly procedure. 18. Restore power to the booster. Consult the factory with questions or if assistance is required with replacing the melt link or checking any the systems described in this procedure. THIS PROCEDURE MUST BE PERFORMED BY A QUALIFIED ELECTRICIAN Page 7

10 EXPLODED VIEW DIAGRAM Page 8

11 HPB PARTS LIST NOTE: When ordering replacement parts, please include unit model number and serial number. DWG. REF. DESCRIPTION HPB11 ITEM HPB15 ITEM HPB22 ITEM 1. Stainless Steel Panel, Back Stainless Steel Panel, Front Aluminized Steel Panel, Top Aluminized Steel Panel, Right Aluminized Steel Panel, Left " Blanket Insulation, Back & Sides (Outer) " Blanket Insulation, Back & Sides (Inner) " Blanket Insulation, Top & Front (Inner) " Blanket Insulation, Top & Front (Middle) " Blanket Insulation, Top & Front (Outer) Galvanized Steel Panel, Back Galvanized Steel Panel, Right Galvanized Steel Panel, Left Galvanized Steel Panel, Top Galvanized Steel Panel, Front Element Wiring Harness Core Temperature Sensor Main Wiring Harness Element Jumpers Heating Element (277 V, 1830W) Heating Element (208V, 1830W) Heating Element (240V, 1830W) R R R R R R R R R 19. Heat Storage Brick Control Board Mounting Plate Relay Interface Board (SFIII) R R R 22. Damper Motor R R R 23. Leveling Legs Fan Wiring Harness Base Assembly Core Charging High Limit Switch Assembly R R R o F Low Core Temperature Switch R R R 28. Limit Bar Channeling Plate Limit Bar Louvre Panel Painted Panel, Back Painted Panel, Right Painted Panel, Left Painted Panel, Front Painted Panel, Top Electrical Panel Cover Air Delivery Damper Assembly Core Damper Linkage Assembly Core Blower Motor (1/3 HP, 1625 RPM) Page 9

12 DWG. REF. DESCRIPTION HPB11 ITEM HPB15 ITEM HPB22 ITEM 39. Core Blower Wheel R R R 40. Slam Gate Interlock Switch Slam Gate Melt Link Slam Gate Melt Link Linkage Slam Gate Actuator Complete Air Discharge High Limit R R R 45. Air Discharge Controller R R R 46. Inlet/Outlet Plenum Assembly Motor Run Capacitor Circuit Breaker Standoff Charge Control Resistor Hardboard Base Insulation Charge Control Circuit Board (SFIII) Low Temperature Duct Sensor R R R 53. Charge Control Thermostat Assembly R R R 54. Fan Relay VA Control Transformer Electrical Panel Stage 2 Time Delay Sequencer Charging Sequencers Amp Circuit Breaker GE Brand* 15 Amp Circuit Breaker Siemens Brand* Amp Circuit Breaker (208/240V) Siemens Brand* 60 Amp Circuit Breaker (208/240V) GE Brand* 60 Amp Circuit Breaker (277V) GE Brand* R R R R R R R R R R R R Outdoor Air Temperature Sensor Assembly o Core Temperature Control N/A N/A * When replacing breakers in a Steffes heating system, it is important to replace with like brand heaters. Page 10