Fujitsu AB 14LBAJ Series Service Instruction page 37

4. COOLING PRESSURE OVER RISE PROTECTION
When the outdoor unit heat exchange sensor temperature rises to
the compressor is stopped and error display is indicated.
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 14 : Heating Overload Protection Control)
Indoor heat exchange
temperature
63°C
Temperature
Temperature
AO*18LMAK2
AO*24LMAM2
AO*30LMAW4
6. HIGH PRESSURE PROTECTION
(1).
When the pressure switch becomes OFF (Open : higher than 609.2 psi / 4.2 MPa),
the compressor is stopped.
It is released when the pressure switch becomes ON (Close : lower than 464.1 psi / 3.2 MPa)
after 3 minutes of compressor stop.
(2).
When the pressure switch is opened for 10 seconds from power on, all of outdoor unit operation is stopped.
The outdoor unit will start up if the pressure switch is returned to ON after 10 seconds has passed.
When 10 minutes (Cooling) or 3 minutes (Heating) has passed from the compressor stop and
pressure switch becomes ON, protection is released and the compressor will restart.
7. COMPRESSOR TEMPERATURE PROTECTION
Compressor temperature sensor is monitoring the compressor temperature.
When the compressor temperature sensor detects higher than Temperature ,
the compressor is stopped.
When 3 minutes has passed from the compressor stop and the compressor temperature sensor detects
lower than Temperature , protection is released and the compressor will restart.
AO*18LMAK2
AO*24LMAM2
AO*30LMAW4
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 60 seconds.
Temperature Temperature
54°C
56°C
Temperature Temperature
+ -
120 5°C
85 7°C
130°C
01-34
70.5°C
50°C
52°C
Sensor type
+ - Thermal switch
80°C Thermistor
or greater,