38GXC(Q)/40GXC(Q) Service Training Sizes 18 and 24K
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Transcript of 38GXC(Q)/40GXC(Q) Service Training Sizes 18 and 24K
38GXC(Q)/40GXC(Q) Service TrainingSizes 18 and 24K
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NORMAL OPERATIONS
Red LED Yellow LED Green LEDCompressor Starts 1 Flash None
Defrost 2 Flashes H1Set Point Satisfied 8 Flashes None
Normal Communication Flash None
Outdoor Unit LED'sOperationIndoor Unit
Display
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UNIT PROTECTION
Red LED Yellow LED Green LED
Freeze - 3 Flashes - E2Low refrigerant
charge or blocked indoor air flow
1
IPM - 4 Flashes - H5
Loss of cooling to heat sink, high
ambient temperature, low voltage, or bad
connection.
2
Over Current - 5 Flashes - E5
High ambient temperature,blocked outdoor coil, or
locked rotor current
3
Coil Temperature - 6 Flashes - E8High ambient or
loss of condenser air flow
4
Comp. Disch. Temp. - 7 Flashes - E4
Low refrigerant charge, blocked capillary tube, or
high ambient temperature
5
Comp. Temperature - 8 Flashes - H3
Low refrigerant charge,blocked
capillary, or compressor motor
failure
6
Low Voltage - - - PL - -High Volatge - - - PH - -
Possible Cause
Flow Chart #Protection Outdoor Unit LED's Indoor Unit
Display
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COMPONENT FAILURES
Red LED Yellow LED Green LED
Outdoor Coil Sensor 5 Flashes - - F4 Bad connection or sensor failure
7
Outdoor Air Sensor 6 Flashes - - F3 Bad connection or sensor failure
7
Comp. Dish. Sensor 7 Flashes - - F5 Bad connection or sensor failure
7
Communication - - Off E6Wiring, indoor or
outdoor board failure
8
Return Air Sensor - - - F1 Bad connection or sensor failure
7
Indoor Coil Sensor - - - F2 Bad connection or sensor failure
7
Indoor Motor - - - H6 Bad connection or motor failure
9
Failure Outdoor Unit LED's Indoor Unit Display
Possible Cause
Flow Chart #
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COMPRESSOR FREQUENCY
Red LED Yellow LED Green LED
Limit frequency 1 Flash - - - Over currentDecrease frequency 1 Flash - - F8 Over current
Decrease frequency 2 Flashes - - F9High compressor
discharge temperature
Limit frequency 3 Flashes - - - Outdoor coil high temperature
Decrease frequency 3 Flashes - - H0 Outdoor coil high temperature
Decrease frequency 4 Flashes - - - Freeze protection
Comp.Frequency Outdoor Unit LED's Indoor Unit Display
Possible Cause
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18K HEAT PUMP WIRING DIAGRAM
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24K HEAT PUMP WIRING DIAGRAM
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18K COOLING ONLY WIRING DIAGRAM
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24K COOLING ONLY WIRING DIAGRAM
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Flow Chart 1 – Indoor Freeze Protection
No
Yes
Replace motor
Connect low side gauge atsuction service valves. Measure
discharge temp. OK?
No
Yes
Check for leaks.
Reclaim charge and fixleak.
Weigh in charge.
No
Clean indoor coil /filter of indoor unit with error message. Problem fixed?
Yes
No
Problem solved
Check indoor boardmotor/ thermistor output
Output ok?Replace indoor board.
Is system running within operating envelope?
System should not be operated
No
Yes
Yes
Check indoor thermistorsOK?
Replace thermistor
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Flow Chart 2 – IPM Protection
Check heat sinks on back of board. OK?
Check if IPM module voltage between P
and N is around 300 V.
Check power supply to main board. OK?
No
Yes
No Clean and reattach. Ok?
Replace main board
Yes
Confirm there is voltage output and balance between any 2 phases of U,V, and W
Yes
Replace the compressor
Correct the powersupply connection
Problem solved
No
Yes
No
Yes
No
Flow Chart 3 – Compressor Over Current Protection
Is unit running in outdoorambient higher than 110 °F?
Beyond operating range
Outdoor coil clean? Clean coil.Problem persists? Problem solved
Check connections from OD board. Loose, corroded,or high resistance?
Check output onoutdoor board. Ok?
Connect low side gauge atsuction service valve. Measure discharge temp.*
Check amp draw to compressor? Values withinrange?
Replace outdoor board
Replace compressor
Clean/repair connection Problem persists?
Problem solved
Replace outdoor board
High head, high suction? High head, low suction?
Unit is overcharged. Reclaim charge and weigh in correct charge.
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No No
No
No
Yes
Yes
No
No
Yes
Yes
Restriction in refrigeration circuit.
YesOutdoor motor ok?
No
Replace motor
*Measure discharge temperature at the sensor on the discharge tube.
Flow Chart 4 – High Condensing Temperature
Is unit running in outdoorambient higher than 110 °F?
Beyond operating range
Outdoor coil clean? Clean coil.Problem persists? Problem solved
Check outdoor coiltemperature thermistor.Chart 4, ok?
Check motor for openor short. Ok?
Check output on outdoorboard. Ok?
Replace outdoor board
Replace thermistor. Problem persists
Problem solved
Replace outdoor motor
Yes
No
No
Yes
No No
No
Yes
No
Yes
Yes
Yes
No
Flow Chart 5 – High Compressor Discharge Temperature
Check compressor discharge line thermistor. Ok?
Suction and discharge pressures low?
Check for leaks.
Reclaim charge and fixleak.
Weigh in charge.
Check for blocked capillary tube or a restriction
in liquid line
Ok
No
No
Yes
No
Yes
*Measure discharge temperature at the sensor on the discharge tube.
Connect low side gauge atsuction service valve. Measure discharge temp.*
NoReplace thermistor
Yes
High head, low suction?
Restriction in refrigeration circuit.
Yes
Flow Chart 6 – High Compressor Temperature
Check compressor Temperature switch Ok?
Suction and discharge pressures low?
Check for leaks.
Reclaim charge and fixleak.
Weigh in charge.
Check for blocked capillary tube or a restrictionin liquid line
Ok
No
Yes
No
Yes
*Measure discharge temperature at the sensor on the discharge tube.
Connect low side gauge atsuction service valve. Measure discharge temp.*
NoReplace switch
Yes
High head, low suction?
Restriction in refrigeration circuit.
Yes
No
Reset main power and restart system using remote.
Problem persists?
Check sensor resistance.
Appendix A4
No further action is required
No
Yes
Flow Chart 7 – Temperature Sensor
Check input and outputon indoor or outdoor board.
Yes
Check sensor connector at ID or OD board Connection good?
NoFix connection
Yes
NoReplace board
NoReplace sensor
Double check connection,for corrosion or high resistance.
Yes
Reset main power and restart system using remote.
Problem persists?
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No further action is required
No
Yes
Flow Chart 8 – Communication Error
Measure Volts DC onoutdoor TB between S & L2
(0-24VDC) Ok?**
Yes
Check the wires (type) and connections betweenIndoor and outdoor units*
No
Fix connection or replace wiring
No
Yes
Replace outdoor board.
* Thermostat wires cannot be used. Wires should be connected per connection diagrams. Failure to do that will result in a communication error. Polarity needs to be maintained between indoor and outdoor units.** There is 3 minutes to make the measurement before the diagnostic light comes back on.
Measure Volts DC onindoor TB between S & L2
(0-24VDC). Ok?**
No
Replace indoor board.
Recheck wiring and connections
Notes:
Before measuring the Volts DC on outdoor TB,disconnect the field wire on terminal S.
Before measuring the Volts DC on Indoor TB,disconnect the field wire on terminal S.
Have the red probe of the meter on terminal Sand the black probe on terminal N. Reconnect wiring when measurements are complete.
Reset circuit breaker. Is problem fixed?
Problem fixedYes
Yes
No
Reset main power and restart system using remote.
Problem persists?
Replace indoor fan motor
No further action is required
No
Yes
Flow Chart 9 – Indoor Fan
Check IFM output and and input on indoor
board. Values good?
Yes
Check motor connection. Connection good?
NoFix connection
Yes
NoReplace indoor board
TEMPERATURE/PRESSURE CHART Cooling:
Compressor Suction Discharge Compressor Suction DischargeSpeed Pressure Temperature Speed Pressure Temperature(Hz) (PSI) (F) (Hz) (PSI) (F)
55 (Min) 18 154 78 18 165 7355 (Max) 78 93 144 88 98 14575 (Min) 18 178 93 18 185 8275 (Max) 78 103 164 88 108 16395 (Min) 18 190 106 18 206 10095 (Max) 78 118 185 88 125 177115 (Min) 18 210 124 18 226 112115 (Max) 78 130 207 78 137 194
Heating:
Compressor Suction Discharge Compressor Suction DischargeSpeed Pressure Temperature Speed Pressure Temperature(Hz) (PSI) (F) (Hz) (PSI) (F)
17/15 (Min) 18 77 62 18 76 5417/15 (Max) 77 58 133 92 56 11935/33 (Min) 18 104 94 18 108 7535/33 (Max) 77 83 180 92 83 16347/43 (Min) 18 130 96 18 132 8047/43 (Max) 77 100 202 92 101 19062/57 (Min) 18 164 105 18 165 8762/57 (Max) 77 133 197 92 135 189
Indoor 75/-- F, Outdoor Ambient
(F)
18K 24K
Indoor 80/67 F, Outdoor Ambient
(F)
18K 24K