Fujitsu AB*G30LRTE series, Service Instruction

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01-22
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.
Indoor heat exchange
temperature rises
Indoor heat exchange
temperature drops
[ Control System ]
It returns to the normal operation
Compressor is stopped
53°C
55°C
63°C
50°C
The compressor frequency is
decreased 2rps every 120seconds.
The compressor frequency is
decreased 15rps every 120seconds.
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.
24. COMPRESSOR STOP CONTROL
When the detection value of outdoor temperature sensor is lower than Temp in the Table 22,
the compressor is stopped.
( Table 22 : Operation temperature of compressor stop control )
Temperature
AO* G30/ 36LETL
Cooling Heating
-15°C
Stable zone