Fujitsu AB A30LBT Series Service Instruction page 81

Operation status output
Corresponding indoor units : All indoor units
Contents of operation : An air conditioner operation status signal can be output.
Circuit diagram example
Indoor
control PC board
CN103 5 to 24V
1
2
ON
Air conditioner
OFF
ON
Signal
OFF
Relay circuit
V
Signal
Procured at the site
Display
Relay
power
supply
03-12