Fujitsu AB A30LBT Series Service Instruction page 79

EXTERNAL OUTPUT
External electrical heater control output
Corresponding indoor units : Duct type
Contents of operation : A signal linked to heating operation, indoor fan ON, and compressor ON
Circuit diagram example
Indoor
control PC board
13.5 V
CN10*
1
2
*CN15 for high static pressure duct type
ON
Heating
operation
OFF
ON
Signal
OFF
can be output.
* Signal ON / OFF is switched according to the set temperature and room
temperature difference.
Relay circuit
Signal
Procured at the site
03-10
(Example) Heater
Relay
power
supply