Test Pin - Panasonic U-72MF2U9 Service Manual

6. 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 (CN22, black), then turn the power 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
1
6 Relay RY6
7 Relay RY18
8 Relay RY19
9 Relay RY11
2
10 Relay RY10
11 Relay RY8
12 Relay RY1
13 Relay RY2
3
14 Relay RY5
4
5
6
7
8
9
Operation
Suction valve 1 (SCV1)
Suction valve 2 (SCV2)
Discharge valve 1 (DCV1)
Discharge valve 2 (DCV2)
Save valve (SAVE)
Oil recovery valve (ORVR)
Pressure balance valve 1 (PBV1)
Pressure balance valve 2 (PBV2)
Refrigerant balance valve (RBV)
Refrigerant control valve (RCV)
Bypass valve (BPV)
Crankcase heater 1 (CH1)
Crankcase heater 2 (CH2)
Accumulation control valve (ACV)
5 - 30 5 - 30
3WAY VRF SYSTEM
Trouble Diagnosis