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Service Procedures
3
SM830063
12. Check Pins
12-1. Indoor PCB (Printed Circuit Board)
If the check pins on the indoor PCB (Printed Circuit Board) are short-circuited, output operation for each unit can be
performed independently.
● If the FORCED OPR pins (CN5, white) are short-circuited, the indoor unit enters the operation mode listed in the table
below.
● Without connecting the remote controller, the indoor unit can be operated independently.
Output Operation
1 Relay 2X Indoor fan motor operates in high fan speed mode.
2 Relay RY2 Dew proof heater and drain pump operate.
3 Electronic refrigerant control valve Fully open (480 steps)
12-2. Outdoor PCB (Printed Circuit Board)
If the check pins on the outdoor PCB (Printed Circuit Board) are short-circuited, output operation for each section can be
performed independently.
● If the CHECK pins (CN26, red) are short-circuited after turning off the power to the outdoor unit, and the power is turned
on again, output is executed for 3 seconds for each section. After the output is completed, the outdoor unit enters the stop
mode.
Output Operation
1 LEDs 1 to 8 Lit
2 An LED distant from LEDs 1 to 8 Lit
3 Alarm LED Lit
4 Relay RY10 Save valve (SAVE) ON
5 Relay RY6 High pressure valve (HPV) ON
6 Relay RY7 Low pressure valve 1 (LPV1) ON
7 Relay RY8 Low pressure valve 2 (LPV2) ON
8 Relay RY9 Low pressure valve 3 (LPV3) ON
9 Relay RY3 4-way valve (2OS) ON
10 Relay RY4 Liquid valve (Power control compressor) ON
11 Relay RY5 Liquid valve (Standard compressor) ON
NOTE
NOTE
● If the double speed pins (TEST PIN) (CN27, yellow) on the outdoor PCB (Printed Circuit Board) are short-circuited
after the above operation, the outdoor fan and compressor operate in the cooling mode. However, if the protection
device is activated, they will enter the alarm operation mode.
If you do not want to activate the compressor, disconnect the compressor wiring from the magnetic contactor.
13. Double Speed of Time for the Timer
● If the double speed pins (TEST PIN) (CN27, yellow) on the outdoor PCB (Printed Circuit Board) are short-circuited,
the time for each delay timer on the outdoor side is shortened.
If the outdoor unit is turned on and off repeatedly in the double speed mode, the compressor will be damaged.
So operates the double speed mode with care. (Normally set this mode to OFF.)
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