Test Pin - Panasonic U-8ME1E8E 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 (CN048, white), 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 RY012 Supercooling valve 1 (SCV1)
2 Relay RY013 Supercooling valve 2 (SCV2) *
3 Relay RY016 Discharge valve 2 (DCV2)
4 Relay RY015 Discharge valve 1 (DCV1)
5 Relay RY014 Bypass valve (BPV)
6 Relay RY006 Recovery valve (ORVR)
7 Relay RY005 Balance valve (BALV)
8 Relay RY018 Pressure balance valve 1 (PBV1)
9 Relay RY011 Refrigerant balance valve (RBV)
10 Relay RY010 Refrigerant adjustment valve (RCV)
* The asterisk (*) mark stands for the series of "3Way".
Operation
*
*
Output
11 Relay RY008 Save valve (SAVE)
12 Relay RY019 Pressure balance valve 2 (PBV2)
13 Relay RY002 Crankcase 2 (CH2)
14 Relay RY001 Crankcase 1 (CH1)
15 Relay RY014 Supercooling valve 3 (SCV3)
16 Relay RY017 Discharge valve 3 (DCV3)
17 Relay RY020 Pressure balance valve 3 (PBV3)
18 Relay RY003 Crankcase 3 (CH3)
6 - 31
2WAY SYSTEM
Trouble Diagnosis
Operation
*
*
*
*
6