Panasonic U-72MF2U9 Installation Instructions Manual page 44

7-4. Function Switches on P.C. Board
Function Switch
MODE pin (3P, BLK)
(CN40)
A.ADD pin (2P, WHT)
(CN30)
CHK pin (2P, WHT)
(CN23)
RC plug (3P, BLU)
(CN73)
RUN pin (2P, WHT)
(CN27)
STOP pin (2P, WHT)
(CN28)
AP pin (2P, WHT)
(CN24)
SNOW plug (3P, RED)
(CN34)
SILENT plug (2P, WHT)
(CN33)
For details, refer to Test Run Service Manual.
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.
Short circuited for over 1 second long
If short circuit lasts for over 1 second long during auto address setting, the setting is interrupted.
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.
Connects to outdoor unit maintenance remote controller and content of alarm message will be
checked.
When short circuited and pulse signal is given, all indoor units operate in the same refrigerant
system.
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.)
Can be used when vacuuming the outdoor unit.
Can be used when installing a snowfall sensor device.
Can be used when setting the outdoor unit fan in sound absorbing mode.
Remarks
Auto address setting starts with open-circuit.
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