Fujitsu AW?Z24LBC, Service Instruction

Page: 34 / 97

(3). ANTIFREEZING CONTROL (Cooling and Dry mode)
The compressor frequency is decrease on cooling & dry mode when the indoor heat exchanger
temperature sensor detects the temperature lower than Temperature .
Then, the anti-freezing control is released when it becomes higher than Temperature .
A-D
E,F
(Table 17 : Anti-freezing Protection Operation / Release Temperature)
Temperature Temperature
4°C
4°C 7°C
13°C
(4). COOLING PRESSURE OVERRISE PROTECTION
(Table 18 : Cooling Pressure Over Rise Protection Function Temperature)
When the outdoor unit heat exchange sensor temperature rises to temperature or greater, the
compressor is stopped and trouble display is performed.
AW * Z24LBC 67°C
Temperature
(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.
05-20
[AW * Z24LBC ]
59Hz or greater 57Hz
31 57Hz
23 29Hz 21Hz
21Hz OFF
Indoor heat exchange
temperature
[ Control System ]
Temperature
Temperature
Refer to below
Temperature
Temperature
The compressor frequency is
precisely controlled so that
it does not exceeds Temperature .
It returns to the normal operation
Compressor Operation
Frequency down every 120 sec
AW * Z24LBC 55°C
Temp
Temp Temp Temp
53°C 52°C 50°C
Zone
Refer to Fig.1