Johnson Controls YVAHP0721CW Series, Service Manual

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3-34
SM-16007
TROUBLESHOOTING
NOTES:
• Emergency operation is available only when the alarm codes above (*) are indicated.
• The emergency operation is not available for malfunction of the inverter PCB or fan controller.
• This emergency operation is not a normal operation but a temporary operation until the service people
come. If the alarm is indicated again during the emergency operation, the alarm cannot be canceled.
• Do not perform an emergency operation for more than eight hours. Otherwise, the unit may be
damaged.
(2) Emergency Mode Operation from Outdoor Unit PCB for Compressor Failure
1
For Combination of Outdoor Units
((H,Y)VAHP144B(3,4)1CW to (H,Y)VAHP288B(3,4)1CW)
<Alarms Corresponding to Inverter Compressor Failure>
04: Abnormal Communication between inverter PCB and Outdoor Unit PCB
06: Abnormality of Inverter Voltage
23: Abnormality of Discharge Gas Thermistor
48: Activation of Overcurrent Protection Device
51: Abnormality of Inverter Current Sensor
53: Inverter Error Signal Detection
54: Abnormality of Inverter Fin Temperature
55: Inverter
Failure
<Alarms Corresponding to Fixed Speed Compressor Failure>
23: Abnormality of Discharge Gas Thermistor
39: Abnormality of Running Current at Fixed Speed Compressor
(a) Procedures
1. Turn OFF all the main switches of the outdoor and indoor units.
2. If the inverter compressor is faulty, disconnect the wiring (U, V, W) of the diode module.
(Insulate the disconnected terminals.) *1
3. Turn DSW5-No.1 or No.2 ON to stop the compressor operation. If either is set, NONE of the
compressors in the failed outdoor unit will operate. *2
For the heat pump system, fully close the stop valves (for gas/liquid) of the failed outdoor unit.
4. Turn ON the power supply.
5. Start the operation with the wired controller.
0
8
7
5 4
3
2 1
ON
1 2 3 4
ON
1 2 3 4
ON
1 2 3 4
ON
1 2 3 4 5 6
ON
1 2 3 4 5 6
ON
1 2 3 4 5 6
ON
1 2 3 4 5 6
ON
1 2
SEG2 SEG1
DSW1
DSW2 DSW3
DSW5
DSW7 DSW6
DSW4
PSW2
PSW5
PSW1
PSW3
PSW4
RSW1
DSW10
9
6
(DSW5)
ON
1 2 3 4 5 6
Failed Outdoor Unit
Even if one unit fails,
the others can be operated continuously.
/
2
Compressor
Compressor
Compressor
x
 2: Outdoor Unit PCB
௅ (+)
AC1 AC2 AC3
 1: Diode Module