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Name And Function Of Each Switch On Outdoor Unit Control P.C. Board
Function Switch
Remarks
MODE pin (3P, BLK)
(CN40)
Changes to cooling/heating mode. (outdoor main unit is only usable.)
When in normal operation: When short circuited the COOL side, indoor unit operation in the same
refrigerant system changes to all cooling mode.
When short circuited the HEAT side, indoor unit operation in the same
refrigerant system changes to all heating mode.
When in auto address setting: Changes to heating mode with open-circuit.
A.ADD pin (2P, BLK)
(CN30)
Short circuited for over 1 second long Auto address setting starts with open-circuit.
If short circuit lasts for over 1 second long during auto address setting, the setting is interrupted.
CHK pin (2P, BLK)
(CN23)
When short circuited, test run begins.
(If the remote controller is connected in test run mode, it is automatically cancelled after 1 hour.)
Also, if short-circuit is cancelled, test run mode is cancelled.
RC plug (3P, BLU)
(CN73)
Connects to outdoor unit maintenance remote controller and content of alarm message will be checked.
RUN pin (2P, BLK)
(CN27)
When short circuited and pulse signal is given, all indoor units operate in the same refrigerant system.
STOP pin (2P, BLK)
(CN28)
When short circuited and pulse signal is given, all indoor units stop in the same refrigerant system.
(When short circuited, operation cannot be performed by the indoor unit's remote controller.)
AP pin (2P, BLK)
(CN24)
Can be used when vacuuming the outdoor unit.
SNOW plug (3P, RED)
(CN34)
Can be used when installing a snowfall sensor device.
SILENT plug (2P, WHT)
(CN33)
Can be used when setting the outdoor unit fan in sound absorbing mode.
OC EMG terminal
(3P, BLK) (CN69)
If “TO INDOOR UNIT” accidently connected to high voltage, use the terminal base TM1.
Method: 1. Replace the pins 1 and 2 of CN69 with the pins 2 and 3.
2. Disconnect JP11.
RC1 EMG terminal
(3P, BLK) (CN82)
If “TO OUTDOOR UNIT” accidently connected to high voltage, use the terminal base TM1.
Method: 1. Replace the pins 1 and 2 of CN82 with the pins 2 and 3.
2. Disconnect JP12.
For details, refer to the Test Run Service Manual.
CN30
CN82
CN69
SW7
JP11
TM1
CN40
CN22
CN27
CN73
CN67
CN23
CN24
LED1 LED2
CN33 CN34
SW4
SW3
SW2
SW1
SW5
SW6
CN28
JP12
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2022/9/19 9:27:32
