Test Pin - Panasonic U-8ME1E81 Service Manual

7. Test Pin

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 (CN22, black), 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 4-way valve (20s)
2 Relay RY4 Bypass valve (BPV)
3 Relay RY6 Oil recovery valve (ORVR)
4 Relay RY11 Refrigerant balance valve (RBV)
5 Relay RY10 Refrigerant control valve (RCV)
Operation
6
7
8
9
3-33
Output
Relay RY8 Save valve (SAVE)
Relay RY1 Crankcase 1 (CH1)
Relay RY2 Crankcase 2 (CH2)
Relay RY3 Crankcase 3 (CH3)
2WAY SYSTEM
Trouble Diagnosis
2WAY SYSTEM
Trouble Diagnosis
Operation
1
2
3
4
5
6
7
8