Fujitsu AO*12LFBC, Service Instructions Manual

Page: 38 / 83

(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 .
AS*9LSACW
AS*12LSACW
AS*9LSBCW
AS*12LSBCW
AS*14LSBCW
AS*18LSBCW
(Table 19 : Anti-freezing Protection Operation / Release Temperature)
Temperature Temperature
4 C
4 C
4 C
4 C
4 C
4 C
7 C
7 C
7 C
7 C
7 C
7 C
(4). COOLING PRESSURE OVERRISE PROTECTION
(Table 20 : 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.
AS*9LSACW 65 C
AS*12LSACW 65 C
AS*9LSBCW 67 C
AS*12LSBCW 67 C
AS*14LSBCW 65 C
AS*18LSBCW 65 C
Temperature
AS*9LSACW
AS*12LSACW
AS*9LSBCW
AS*12LSBCW
AS*14LSBCW
AS*18LSBCW
Indoor heat exchange
temperature
[ AS*9/12LSBCW ]
52Hz or greater 51Hz
26 51Hz
18 25Hz OFF
AS*9LSACW 52 C 48 C 54 C 50 C
AS*12LSACW 52 C 48 C 54 C 50 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.
(The control system is different depending on the product model)
Control system
(Fig 11 : Heating Overload Protection Control)
[ Control System ]
Temperature
Temperature
Refer to below
The frequency increase every
60 seconds gradually.
It returns to the normal operation
after 5 minutes.
Fan Hi Other than Hi
Temp Temp Temp Temp
Compressor Operation
Frequency down evry 60 seconds
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