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3WAY SYSTEM
Trouble Diagnosis
7. Test Pin
When the test pin on the outdoor unit control PCB is short-circuited, each part can be operated individually.
After turning OFF the main unit power, short circuit the test pin (CN022, WHT), then turn the power back ON.
Output is performed in the sequence shown in the table below, for 0.5 seconds each.
Output Operation
Relay RY12
Relay RY13
Relay RY16
Relay RY15
Relay RY4
Relay RY6
Relay RY18
Relay RY11
Relay RY10
Relay RY8
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Relay RY19
Relay RY2
Relay RY1
Relay RY17
Relay RY20
Suction valve 1 (SCV1)
Suction valve 2 (SCV2)
Discharge valve 2 (DCV2)
Discharge valve 1 (DCV1)
Bypass valve (BPV)
Oil recovery valve (ORVR)
Pressure balance valve 1 (PBV1)
Refrigerant balance valve (RBV)
Refrigerant adjustment valve (RCV)
Save valve (SAVE)
Pressure balance valve 2 (PBV2)
Crankcase heater 2 (CH2)
Crankcase heater 1 (CH1)
Discharge valve 1A (DCV1A)
Discharge valve 2A (DCV2A)
5/A9#;'%1K5;56'/A5G
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