Fujitsu ASUH09LPAS Service Manual page 146

• Indoor unit fan operation status
Rotary SW on External
Input and Output PCB
1
2
B
D
Output signal
On
Low → High
Off
High → Low
• External heater output
Rotary SW on External
Input and Output PCB
2
B
C
2-4. Details of function
External output
External Input and Output PCB
The indoor unit fan is operating.
The fan is stopped or during cold air prevention.
During thermostat off when in dry mode operation.
Fan run
Indoor unit
Fan stop
On
CN311―312
Off
External output
External Input and Output PCB
- (05-22) -
Output
signal
Off → On
CN312
On → Off
Off → On
CN311
On → Off
Condition
Output
signal
Off → On
CN312
On → Off
Command
Fan run
Fan stop
Fan run
Fan stop
Command
Heater on
Heater off
2. External input and output