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Indoor unit fan operation status
Rotary SW on External
Input and Output PCB
External output
Output
signal
Command
1
External Input and Output PCB
CN312
Off → On
Fan run
On → Off
Fan stop
2
B
D
CN311
Off → On
Fan run
On → Off
Fan stop
Output signal
Condition
On
The indoor unit fan is operating.
Low → High
Off
The fan is stopped or during cold air prevention.
High → Low
During thermostat off when in dry mode operation.
Fan run
Fan stop
On
Off
CN311―312
Indoor unit
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External heater output
Rotary SW on External
Input and Output PCB
External output
Output
signal
Command
2
B
C
External Input and Output PCB
CN312
Off → On
Heater on
On → Off
Heater off
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8-4. Details of function
8. External input and output
WALL MOUNTED
ASUH09-12LPAS
WALL MOUNTED
ASUH09-12LPAS