Test Pin - Panasonic U-10MF1E8 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 RY024
2 Relay RY025
3 Relay RY021
4 Relay RY020
5 Relay RY005
6 Relay RY007
7 Relay RY006
8 Relay RY022
9 Relay RY017
10 Relay RY016
5
Operation
Supercooling valve 1 (SCV1)
Supercooling valve 2 (SCV2)
Discharge valve 2 (DCV2)
Discharge valve 1 (DCV1)
Bypass valve (BPV)
Recovery valve (ORVR)
Balance valve (BALV)
Pressure balance valve 1 (PBV1)
Refrigerant balance valve (RBV)
Refrigerant adjustment valve (RCV)
Output
11 Relay RY012 Save valve (SAVE)
12 Relay RY023 Pressure balance valve 2 (PBV2)
13 Relay RY003 Crank case 2 (CH2)
14 Relay RY002 Crank case 1 (CH1)
15 Relay RY019 Supercooling valve 3 (SCV3)
16 Relay RY026 Discharge valve 3 (DCV3)
17 Relay RY027 Pressure balance valve 3 (PBV3)
18 Relay RY004 Crank case 3 (CH3)
5 - 30
3-WAY SYSTEM
Trouble Diagnosis
Operation