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38GXM/40GXM Service Training

38GXM/40GXM Service Training. GXM XPOWER MULTI HIGH WALL SYSTEM Up to 14.5 SEER (18K to 30K) Heat Pump. Rated combinations. Features: Inverter Compressor Technology Condensing unit: 18, 24, 30K Fan coils: 9, 12, 18K Up to 14.5 SEER and 8.5 HSPF

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38GXM/40GXM Service Training

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  1. 38GXM/40GXM Service Training

  2. GXM XPOWER MULTI HIGH WALL SYSTEMUp to 14.5 SEER (18K to 30K) Heat Pump Rated combinations • Features: • Inverter Compressor Technology • Condensing unit: 18, 24, 30K • Fan coils: 9, 12, 18K • Up to 14.5 SEER and 8.5 HSPF • Connect up to 51K fan coils to 30K (4:1) condensing unit • Add additional fan coils later • First fan-coil determines cooling / heating mode • Wireless controller only (Deg C and F) 9K 9K 18K 2:1 12K 12K 24K 2:1 9K 9K 9K 30K 4:1 9K

  3. GXM XPOWER MULTI HIGH WALL SYSTEMUp to 20 Combinations

  4. POWER WIRINGFrom outdoor / independent

  5. INTERCONNECTING WIRING CABLE REQUIREMENTS Use conduit if required by NEC and local codes Back to main menu

  6. USER INTERFACEWireless controllers - Carrier

  7. CARRIER DFS FAMILY OPERATING RANGE – GXM NO LOW AMBIENT CONTROLS AVAILABLE

  8. Refrigeration Components Metering Device – Electronic Expansion Valves in Outdoor Unit Reversing Valve – Energized in Heating

  9. REFREGERANT PIPING 38GXM/40GXM series allowable line lengths/sizes Back to main menu

  10. REFREGERANT PIPING 38GXM/40GXM series conversion joints Back to main menu

  11. LONG-LINE GUIDES 38GXM/40GXM series additional charge and capacity reduction Back to main menu

  12. 18 AND 24K Diagnostic Chart

  13. 30K Diagnostic Chart - General

  14. 30K Diagnostic Chart - Specific

  15. 18K WIRING DIAGRAM

  16. 24K WIRING DIAGRAM

  17. 30K WIRING DIAGRAM

  18. Flow Chart 1 – HIGH PRESSURE SWITCH PROTECTION Yes Is unit running in outdoor ambient higher than 115 °F? Beyond operating range No No No Clean coil. Problem persists? Problem solved Outdoor coil clean? Yes Yes No Check pressure switch. Ok? Replace switch Yes No Connect low side gauges, compare readings. Are they similar? Yes Yes Check EXV output on main board. Ok? All low side pressures are high ? Replace EXV Yes No Yes System over charged. Reclaim and weigh in charge No Check motor output on main board. Ok? Replace main outdoor board Yes Replace motor

  19. Flow Chart 1 – HIGH PRESSURE SWITCH PROTECTION Yes Is unit running in outdoor ambient higher than 115 °F? Beyond operating range No No No Clean coil. Problem persists? Problem solved Outdoor coil clean? Yes Yes No Check pressure switch. Ok? Replace switch Yes No Connect low side gauges, compare readings. Are they similar? Yes Yes Check EXV output on main board. Ok? All low side pressures are high ? Replace EXV Yes No Yes System over charged. Reclaim and weigh in charge No Check motor output on main board. Ok? Replace main outdoor board Yes Replace motor

  20. Flow Chart 2 – COMPRESSOR HIGH DISCHARGE TEMPERATURE Yes Is unit running in outdoor ambient higher than 115 °F? Beyond operating range No No No Clean coil. Problem persists? Problem solved Outdoor coil clean? Yes Yes Check compressor discharge temp. thermistor. Chart 9, ok? No No Replace thermistor. Problem persists Problem solved Yes Yes Connect low side gauge at suction service valves. All values low? No Yes Check EXV outputs on main board? OK Replace main board Yes Yes Low charge. Reclaim and weigh in new charge. Replace EXV

  21. Flow Chart 3 – Communication Error Check the wires (type) and connections between outdoor and indoor units . Fix connection or replace wiring. Problem resolved? No Yes Replace indoor unit board in unit displaying error. Problem resolved? Turn all indoor units on. Do they all display error code? Yes No No further action required No Yes Yes Check PFC board. OK? Chart # 13 Replace PFC/Driver board assembly Is electric box B fuse burnt out? No No Yes Yes Replace PFC/Driver board assembly Check outdoor main board. Chart # 14OK? . No Replace outdoor main board. Problem resolved? No Yes No further action required

  22. Flow Chart 4 – IPM MODULE PROTECTION Turn power off. Unplug P,N,U,V,W wires. Check resistance between P-N, U-N, V-N, W-N. Is resistance 0? No Yes Is red LED1 blinking 3 or 10 times? Replace PFC/Driver board assembly Yes No Red LED1 is blinking 3 times. Check wiring to P,N,U,V,W. Wiring OK? No Is red LED1 blinking 10 times? Fix wiring Yes Yes Turn unit on. Is the voltage between P and N 310 V when the compressor is off and 380V when compressor is on? IPM module over heated. Check that the thermal grease is evenly spread, the screws are tightened, and the heat sink is not blocked. No Check PFC module. Chart # 13 Yes No Check for current imbalance Between U,V,W. Readings normal? Replace PFC/Driver board assembly Yes Replace compressor

  23. Flow Chart 5 – Compressor Over Current Protection Yes Is unit running in outdoor ambient higher than 115 °F? Beyond operating range No No No Clean coil. Problem persists? Problem solved Outdoor coil clean? Yes Yes No Check motor output on outdoor board. Ok? Check compressor. Refer to Chart #15 Yes No Replace motor Outdoor motor ok? Yes Connect low side gauge at suction service valve. Suction pressure normal? No High suction? Yes Yes Unit is overcharged. Reclaim charge and weigh in correct charge. Check compressor. Refer to Chart # 15

  24. Flow Chart 6 – OUTDOOR HIGH CONDENSING TEMPERATURE Yes Is unit running in outdoor ambient higher than 115 °F? Beyond operating range No No No Clean coil. Problem persists? Problem solved Outdoor coil clean? Yes Yes Check outdoor coil temperature thermistor. Chart #9. OK? No No Replace thermistor. Problem persists Problem solved Yes Yes Check motor/thermistor/ outputs on outdoor board. OK? Yes Replace outdoor motor No Replace outdoor board

  25. Flow Chart 7 – INDOOR HIGH TEMPERATURE Yes Is unit running in outdoor ambient higher than 75 °F? Beyond operating range No No No Indoor coil/filter clean? Clean coil and filter. Problem persists? Problem solved Yes Yes Check Indoor coil temperature thermistors. Chart # 9. ok? No No Replace thermistor. Problem persists Problem solved Yes Yes Yes Check motor/thermistors output s on indoor board. Ok? Replace indoor motor No Replace indoor board

  26. Flow Chart 8 – Indoor Freeze Protection No Is system running within operating envelope? System should not be operated Yes Connect low side gauge at suction service valves. All values low? Yes Check for leaks. No Yes Clean indoor coil /filter of indoor unit with error message. Problem fixed? Reclaim charge and fix leak. Problem solved No No Check indoor thermistors OK? Replace thermistor Weigh in charge. Yes Check indoor board motor/ thermistor output Output ok? No Replace indoor board. Yes Replace motor .

  27. Flow Chart 9 – Temperature Sensor Reset main power and restart system using remote. Problem persists? No No further action is required Yes Check sensor connector at ID or OD board Connection good? No Fix connection Yes No Check sensor resistance. Appendix -- Replace sensor Yes Replace indoor or outdoor main board

  28. Flow Chart 10 – COMPRESSOR OVERLOAD PROTECTION Yes Is unit running in outdoor ambient higher than 115 °F? Beyond operating range No No No Clean coil. Problem persists? Problem solved Outdoor coil clean? Yes Yes Check compressor overload switch Ok? No No Replace switch Problem persists Problem solved Yes Yes Connect low side gauge at suction service valves. All values low? No No Check EXV outputs on main board? OK Replace main board Yes Yes Low charge. Reclaim and weigh in new charge. Replace EXV

  29. Flow Chart 11 – STARTUP FAILURE/INVERTER FAILURE/CURRENT IMBAL. No Check Compressor Replace Compressor Yes No Yes Check main board. Chart # 14. OK? Replace main board. Problem resolved? No further action required No Yes No Check PFC board. Chart # 13. OK? Replace PFC/Driver board assembly Yes Replace PFC/Driver board assembly

  30. Flow Chart 12 – Compressor Stops Yes Reset circuit breaker. Problem solved? No further action required No No Yes Check main board. Chart # 14. OK? Replace main board. Problem resolved? No further action required No Yes No Check PFC board. Chart # 13. OK? Replace PFC/Driver board assembly Yes Replace PFC/Driver board assembly

  31. Flow Chart 13 – PFC Protection Check the following when unit is off Replace PFC and IPM assembly .Problem solved? Turn unit off. Check resistance between PN and N on AP2. Resistance =0? Yes Yes No additional action is required No No Replace PFC and IPM assembly . Problem solved? Unit off. Check resistance between AC-L1 and AC-N1. Resistance =0? Yes Yes Problem solved No Yes Unit off. Check resistance between AC-N3 and AC-L3. Resistance =0? Yes Replace PFC electric inductance No Check heat sink. Coil clean, thermal grease spread evenly, screws tight? Yes Fix problem .

  32. Flow Chart 13 – PFC Protection CONTINUED Check the following when unit is on Check outdoor main board. Chart # 14. Problem solved? Yes No Is there power between AC-L1 and AC-N1? No additional action is required. No Yes Replace PFC and IPM assembly. Problem solved? No additional action is required. Yes No Is there voltage between PR and N? No Yes Check connections on 3 wires between AP2 and AP3. Connection good? Is the voltage between PR and N 310 when comp. is on(instead of 380V)? No Yes Fix connection. Problem solved? No Yes No Check 5 wire connection Between AP3 and main board. Connection OK? No Fix connection. Problem solved? Protection due to external power fluctuation No Yes Replace PFC and IPM assembly .

  33. Flow Chart 14 – MAINBOARD CHECK Check source of problem and fix. Replace fuse or boards. Problem solved? No Yes No further action is required Check fuses (3 fuses). OK? No Yes No Check inputs and outputs starting at XT1.Inputs/outputs OK? Replace board Yes Board is OK

  34. Flow Chart 15 – COMPRESSOR CHECK Check resistance of compressor. Resistance OK? No Replace compressor Yes No Replace PFC/Driver board assembly. Problem solved? Check PFC board. Chart #13 OK? No Yes No Check IPM module. Chart # 4OK? Replace PFC/Driver board assembly. Problem solved? No Yes Replace compressor

  35. Flow Chart 16 – Indoor Fan Reset main power and restart system using remote. Problem persists? No No further action is required Yes No Check motor connection. Connection good? Fix connection Yes Check IFM output and and input on indoor board. Values good? No Replace indoor board Yes Replace indoor fan motor

  36. INPUT/OUTPUT CHART

  37. Resistance Chart - 20K

  38. Resistance Chart - 50K

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