Fujitsu ASU18RMLQ Service Instruction page 25

(5). HIGH TEMPERATURE RELEASE CONTROL ( HEATING MODE )
On heating mode, the compressor frequency is controlled as following based on the
detection value of the indoor heat exchanger temperature sensor.
(Fig 8 : Heating Overload Protection Control)
Indoor heat exchange
temperature
145.4°F
(63°C)
132.8°F
(56°C)
125.6°F
(52°C)
Compressor is OFF
The compressor frequency is
decreased 10Hz every 60 seconds.
Hold
Compressor OFF :
Release of protection
Compressor ON :
The compressor frequency is
increased 10Hz every 60seconds.
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