Slide 1

38GXM/40GXM Service Training Slide 2 GXM XPOWER MULTI HIGH WALL SYSTEM Up to 14.5 SEER (18K to 30K) Heat Pump 2 18K 2:1 24K 2:1 Rated combinations 9K 12K 30K 4:1 9K 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) Slide 3 3 GXM XPOWER MULTI HIGH WALL SYSTEM Up to 20 Combinations Slide 4 Model Indoor Wired From Outdoor Indoor Wired Separately GX / GXMYes POWER WIRING From outdoor / independent Slide 5 INTERCONNECTING WIRING CABLE REQUIREMENTS Model Conduit Required Type Of Wire Gauge 0 50 ft Gauge 50 150 ft Gauge 150 200 ft MVC/MVQ/ GXC/GXQ/ RAS/RAV Yes* 4 individual conductors min. 2/64 60C Ins. Minimum 14 AWG Back to main menu Use conduit if required by NEC and local codes Slide 6 System GXM (Multi) C/F convertible Yes Timer 12 Hour Range 25 feet Dedicated AC or HP HP Only Standard / Optional Standard USER INTERFACE Wireless controllers - Carrier Slide 7 CARRIER DFS FAMILY OPERATING RANGE GXM NO LOW AMBIENT CONTROLS AVAILABLE Slide 8 Refrigeration Components Metering Device Electronic Expansion Valves in Outdoor Unit Reversing Valve Energized in Heating Slide 9 Back to main menu REFREGERANT PIPING 38GXM/40GXM series allowable line lengths/sizes Slide 10 Back to main menu REFREGERANT PIPING 38GXM/40GXM series conversion joints Slide 11 Back to main menu LONG-LINE GUIDES 38GXM/40GXM series additional charge and capacity reduction Slide 12 18 AND 24K Diagnostic Chart Slide 13 30K Diagnostic Chart - General Slide 14 30K Diagnostic Chart - Specific Slide 15 18K WIRING DIAGRAM Slide 16 24K WIRING DIAGRAM Slide 17 30K WIRING DIAGRAM Slide 18 Flow Chart 1 HIGH PRESSURE SWITCH PROTECTION Check pressure switch. Ok? Replace motor No Yes Connect low side gauges, compare readings. Are they similar? Replace switch Check EXV output on main board. Ok? Replace main outdoor board No Is unit running in outdoor ambient higher than 115 F? Beyond operating range Outdoor coil clean? Clean coil. Problem persists? Problem solved Yes No Yes Replace EXV Check motor output on main board. Ok? No All low side pressures are high ? Yes System over charged. Reclaim and weigh in charge Yes Slide 19 Flow Chart 1 HIGH PRESSURE SWITCH PROTECTION Check pressure switch. Ok? Replace motor No Yes Connect low side gauges, compare readings. Are they similar? Replace switch Check EXV output on main board. Ok? Replace main outdoor board No Is unit running in outdoor ambient higher than 115 F? Beyond operating range Outdoor coil clean? Clean coil. Problem persists? Problem solved Yes No Yes Replace EXV Check motor output on main board. Ok? No All low side pressures are high ? Yes System over charged. Reclaim and weigh in charge Yes Slide 20 Flow Chart 2 COMPRESSOR HIGH DISCHARGE TEMPERATURE Is unit running in outdoor ambient higher than 115 F? Beyond operating range Outdoor coil clean? Clean coil. Problem persists? Problem solved Check compressor discharge temp. thermistor. Chart 9, ok? Replace thermistor. Problem persists Problem solved Check EXV outputs on main board? OK Yes No Yes No Yes No Yes Connect low side gauge at suction service valves. All values low? No Replace main board Low charge. Reclaim and weigh in new charge. Replace EXV Yes Slide 21 Turn all indoor units on. Do they all display error code?. Replace indoor unit board in unit displaying error. Problem resolved? No Yes Flow Chart 3 Communication Error Is electric box B fuse burnt out? Yes Check the wires (type) and connections between outdoor and indoor units. No Fix connection or replace wiring. Problem resolved? No Yes Check outdoor main board. Chart # 14 OK? Yes No No further action required Yes No Replace outdoor main board. Problem resolved? Yes No further action required Check PFC board. OK? Chart # 13 Replace PFC/Driver board assembly Yes No Slide 22 Is red LED1 blinking 3 or 10 times? 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 Flow Chart 4 IPM MODULE PROTECTION IPM module over heated. Check that the thermal grease is evenly spread, the screws are tightened, and the heat sink is not blocked. Yes No Red LED1 is blinking 3 times. Check wiring to P,N,U,V,W. Wiring OK? Yes Turn unit on. Is the voltage between P and N 310 V when the compressor is off and 380V when compressor is on? Yes Replace PFC/Driver board assembly Is red LED1 blinking 10 times? No Fix wiring Yes No Check PFC module. Chart # 13 Check for current imbalance Between U,V,W. Readings normal? No Replace PFC/Driver board assembly Yes Replace compressor Slide 23 Flow Chart 5 Compressor Over Current Protection Is unit running in outdoor ambient higher than 115 F? Beyond operating range Outdoor coil clean? Clean coil. Problem persists? Problem solved Check motor output on outdoor board. Ok? Connect low side gauge at suction service valve. Suction pressure normal? Check compressor. Refer to Chart # 15 Check compressor. Refer to Chart #15 High suction? Unit is overcharged. Reclaim charge and weigh in correct charge. Yes No Yes No Yes No Yes Outdoor motor ok? Replace motor Yes Slide 24 Flow Chart 6 OUTDOOR HIGH CONDENSING TEMPERATURE Is unit running in outdoor ambient higher than 115 F? Beyond operating range Outdoor coil clean? Clean coil. Problem persists? Problem solved Check outdoor coil temperature thermistor. Chart #9. OK? Check motor/thermistor/ outputs on outdoor board. OK? Replace outdoor board Replace thermistor. Problem persists Problem solved Replace outdoor motor Yes No Yes No Yes No Yes No Slide 25 Flow Chart 7 INDOOR HIGH TEMPERATURE Is unit running in outdoor ambient higher than 75 F? Beyond operating range Indoor coil/filter clean? Clean coil and filter. Problem persists? Problem solved Check Indoor coil temperature thermistors. Chart # 9. ok? Check motor/thermistors output s on indoor board. Ok? Replace indoor board Replace thermistor. Problem persists Problem solved Replace indoor motor Yes No Yes No Yes No Yes No Slide 26 . Flow Chart 8 Indoor Freeze Protection No Yes Replace motor Connect low side gauge at suction service valves. All values low? Yes No Check for leaks. Reclaim charge and fix leak. Weigh in charge. No Clean indoor coil /filter of indoor unit with error message. Problem fixed? Yes No Problem solved Check indoor board motor/ thermistor output Output ok? Replace indoor board. Is system running within operating envelope? System should not be operated No Yes Check indoor thermistors OK? Replace thermistor Slide 27 Reset main power and restart system using remote. Problem persists? Check sensor resistance. Appendix -- No further action is required No Yes Flow Chart 9 Temperature Sensor Yes Check sensor connector at ID or OD board Connection good? No Fix connection Yes No Replace sensor Replace indoor or outdoor main board Slide 28 Flow Chart 10 COMPRESSOR OVERLOAD PROTECTION Is unit running in outdoor ambient higher than 115 F? Beyond operating range Outdoor coil clean? Clean coil. Problem persists? Problem solved Check compressor overload switch Ok? Replace switch Problem persists Problem solved Check EXV outputs on main board? OK Yes No Yes No Yes Connect low side gauge at suction service valves. All values low? No Replace main board Yes Low charge. Reclaim and weigh in new charge. Replace EXV Slide 29 Check Compressor Replace Compressor No Yes Flow Chart 11 STARTUP FAILURE/INVERTER FAILURE/CURRENT IMBAL. Check PFC board. Chart # 13. OK? Yes Check main board. Chart # 14. OK? No Replace main board. Problem resolved? Yes No Replace PFC/Driver board assembly No further action required Yes No Replace PFC/Driver board assembly Slide 30 Reset circuit breaker. Problem solved? Yes Flow Chart 12 Compressor Stops Check PFC board. Chart # 13. OK? Check main board. Chart # 14. OK? No Replace main board. Problem resolved? Yes No Replace PFC/Driver board assembly No further action required Yes No Replace PFC/Driver board assembly No further action required No Slide 31 . Flow Chart 13 PFC Protection Unit off. Check resistance between AC-L1 and AC- N1. Resistance =0? Turn unit off. Check resistance between PN and N on AP2. Resistance =0? Replace PFC and IPM assembly.Problem solved? Yes No Yes Replace PFC electric inductance Yes Unit off. Check resistance between AC-N3 and AC-L3. Resistance =0? No Check heat sink. Coil clean, thermal grease spread evenly, screws tight? No additional action is required Problem solved Yes No Yes Replace PFC and IPM assembly. Problem solved? Fix problem Yes Check the following when unit is off Slide 32 . Flow Chart 13 PFC Protection CONTINUED Is there voltage between PR and N? Is there power between AC-L1 and AC-N1? Check outdoor main board. Chart # 14. Problem solved? No Yes No Check connections on 3 wires between AP2 and AP3. Connection good? Yes Is the voltage between PR and N 310 when comp. is on(instead of 380V)? No Protection due to external power fluctuation No additional action is required. Yes No Yes Replace PFC and IPM assembly. Problem solved? Check 5 wire connection Between AP3 and main board. Connection OK? Check the following when unit is on Fix connection. Problem solved? No Yes Fix connection. Problem solved? No Yes Replace PFC and IPM assembly No No additional action is required. Slide 33 Check fuses (3 fuses). OK? Check source of problem and fix. Replace fuse or boards. Problem solved? No Yes Flow Chart 14 MAINBOARD CHECK Board is OK Yes Check inputs and outputs starting at XT1.Inputs/outputs OK? No Replace board No further action is required Yes No Slide 34 Check resistance of compressor. Resistance OK? Replace compressor No Yes Flow Chart 15 COMPRESSOR CHECK Check IPM module. Chart # 4 OK? Yes Check PFC board. Chart #13 OK? No Yes No Replace PFC/Driver board assembly. Problem solved? No Slide 35 Reset main power and restart system using remote. Problem persists? Replace indoor fan motor No further action is required No Yes Flow Chart 16 Indoor Fan Check IFM output and and input on indoor board. Values good? Yes Check motor connection. Connection good? No Fix connection Yes No Replace indoor board Slide 36 INPUT/OUTPUT CHART Slide 37 Resistance Chart - 20K Slide 38 Resistance Chart - 50K