46
7-4. Function Switches on 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, WHT)
(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, WHT)
(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, WHT)
(CN27)
When short circuited and pulse signal is given, all indoor units operate in the same refrigerant
system.
STOP pin (2P, WHT)
(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, WHT)
(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.
For details, refer to Test Run Service Manual.
01_302412_Eng.indd 46
2018/7/4 13:31:00
