Fujitsu Halcyon AOU12RLQ, Service Instructions Manual

Page: 34 / 81

(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
39°F(4°C)
39°F(4°C)
45°F(7°C)
55°F(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.
ASU9RLQ 153°F(67°C)
ASU12RLQ 153°F(67°C)
ASU18CL 153°F(67°C)
ASU18RL 153°F(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.
05-18
[ ASU9/12RLQ ]
[ ASU18RL ]
46Hz or greater 45Hz
39Hz or greater 38Hz
39 45Hz
38Hz
26 38Hz 25Hz
19 29Hz 18Hz
18 25Hz OFF
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
18Hz
30
Frequency down every 120 seconds Frequency down every 120 seconds
ASU9RLQ 131°F(55°C)
ASU12RLQ 131°F(55°C)
ASU18CL -
ASU18RL 131°F(55°C)
Temp Temp Temp Temp
127°F(53°C)
127°F(53°C)
-
127°F(53°C)
126°F(52°C)
126°F(52°C)
-
126°F(52°C)
122°F(50°C)
122°F(50°C)
-
122°F(50°C)