Fujitsu AB A30LBT Series Service Instruction page 80

Fresh air control output
Corresponding indoor units : All indoor units
Contents of operation : A signal linked to air conditioner indoor fan ON can be output.
Circuit diagrom example
Indoor
control PC board
13.5 V
CN6*
1
2
*CN14 for high static pressure duct type
ON
Indoor fan
OFF
ON
Signal
OFF
* However, signal becomes OFF during cold air prevention control
operation.
Relay circuit
Signal
Procured at the site
03-11
(Example) Fan
Relay
power
supply