Forced Cooling Operation; Compressor Stop Control - Fujitsu ARA12LATN Service Instruction

4. COOLING PRESSURE OVER RISE PROTECTION
On cooling mode, the compressor frequency is controlled as following based on the
detection value of the outdoor heat exchanger temperature sensor.
(Fig.13 : Cooling Pressure Over Rise Protection Control)
Outdoor heat exchange
temperature
67°C
(AR*A12 - 24LATN)
The compressor frequency is
decreased 2Hz every 60seconds.
(AR*A36/ 45LATN)
The compressor frequency is
decreased 5Hz every 60seconds.
62°C
59°C
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
53°C
Compressor Operation
Over than 18Hz
Less than 18Hz

5-22. FORCED COOLING OPERATION

The forced cooling operation starts up when MANUAL / AUTO button is pressed more than 10 seconds.
During the forced cooling operation, it keeps operation regardless of detection value of room
temperature sensor.
Operation LED and Timer LED light up while the unit is on the forced cooling operation.
The forced cooling operation is released after 60 minutes from starting time.

5-23. COMPRESSOR STOP CONTROL

When the detection value of outdoor temperature sensor is lower than temperature
in the table below, the compressor is stopped.
(Table 15 : Operation temperature of compressor stop control)
Operation
temperature
Compressor is OFF
Hold
Release of protection
Refer to below
Frequency down every 60 seconds
OFF
Temperature
Cooling Heating
- 20°C
50°C
05-22