Fujitsu AOU18RLQ Service Manual

(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)
TemperatureTemperature
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.
ASU15RLQ 153°F(67°C)
ASU18RLQ 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
[ ASU15/18RL ]Q
39Hz or greater 38Hz
38Hz
19 29Hz 18Hz
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
ASU15/18RLQ 131°F(55°C)
Temp
Temp Temp Temp
127°F(53°C) 126°F(52°C) 122°F(50°C)

Fujitsu AOU18RLQ Specifications

General

Brand	Fujitsu
Model	AOU18RLQ
Category	Air Conditioner
Language	English