Fujitsu ASG30LMTA Service Instruction page 23

4. COOLING PRESSURE OVERRISE PROTECTION
When the outdoor unit heat exchange sensor temperature rises to 67°C or greater the compressor is
stopped and trouble display is performed.
5. HIGH TEMPERATURE AND HIGH PRESSURE 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.
[ Control System ]
Indoor heat exchange
temperature rises
63°C
The compressor frequency is
decreased 15rps(30) every
120seconds.
55°C
The compressor frequency is
decreased 2rps(30) every
120seconds.
53°C
It returns to the normal operation
6. COMPRESSOR TEMPERATURE PROTECTION
When the compressor temperature sensor detects higher than
108°C , the compressor is stopped.
The protection is released when the compressor temperature sensor detects 80°C
after 3 minutes of compressor stop.
7. HIGH PRESSURE PROTECTION
When the pressure switch becomes OFF (Open : higher than 4.2 MPa),
the compressor is stopped.
It is released when the pressure switch becomes ON (Close : lower than 3.2 MPa)
after 3 minutes of compressor stop.
AMP Air Conditioning
Indoor heat exchange
temperature drops
Compressor is stopped
Stable zone
50°C
01-21
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