Test Pin - Panasonic U-8MF2E8 Service Manual

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
1 Relay RY12
2 Relay RY13
3 Relay RY15
4 Relay RY16
5 Relay RY4
6 Relay RY6
7 Relay RY18
8 Relay RY19
9 Relay RY11
10 Relay RY10
11 Relay RY8
12 Relay RY1
13 Relay RY2
14 Relay RY17
15 Relay RY20
Operation
Suction valve 1 (SCV1)
Suction valve 2 (SCV2)
Discharge valve 1 (DCV1)
Discharge valve 2 (DCV2)
Bypass valve (BPV)
Oil recovery valve (ORVR)
Pressure balance valve 1 (PBV1)
Pressure balance valve 2 (PBV2)
Refrigerant balance valve (RBV)
Refrigerant adjustment valve (RCV)
Save valve (SAVE)
Crankcase heater 1 (CH1)
Crankcase heater 2 (CH2)
Discharge valve 1A (DCV1A)
Discharge valve 2A (DCV2A)
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3WAY SYSTEM
Trouble Diagnosis
5