Compressor Preheating; Powerful Operation - Fujitsu ARU7RLF Service Instruction

14. COMPRESSOR PREHEATING

When the outdoor heat exchanger temperature is lower than Operation temperature (Refer to Table 13)
and the heating operation has been stopped for 3 hours, power is applied to the compressor and
the compressor is heated.
(By heating the compressor, warm air is quickly discharged when operation is started.)
When operation was started, and when the outdoor temperature rises to Release temperature or greater,
preheating is over.
(Table 13 : Preheating Operation / Release Temperature)
Before 24 hour
Operation Release
temperature temperature
37.4°F(3°C) 44.6°F(7°C)

15. POWERFUL OPERATION

The POWERFUL OPERATION functions by pressing POWERFUL button on the remote controller.
The indoor unit & outdoor unit will operate at maximum power as shown in Table 14.
(Table 14 : POWERFUL operation)
COMPRESSOR FREQUENCY
FAN CONT. MODE
SETTING LOUVER
Release Condition is as follows.
[Cooling / Dry]
- Room tenperature < Setting temperature -3.0°F(- 1.5°C) or Operation time has passed 20 minutes.
[Heating]
- Room tenperature > Setting temperature +3.0°F(+1.5°C) or Operation time has passed 20 minutes.
16. MIN. HEAT OPERATION
MIN. HEAT operation performs as below when pressing MIN. HEAT button or
Weekly timer setting on the remote controller.
(Table 15 : MIN. HEAT operation )
Mode
Setting temperature
Fan mode
LED display
Defrost operation
17. ECONOMY OPERATION
The ECONOMY operation functions by pressing ECONOMY button on the remote controller.
At the maximum output, ECONOMY Operation is approximately 70% of normal air conditioner operation
for cooling and heating.
The ECONOMY operation is almost the same operation as below settings.
(Table 16 : ECONOMY operation )
Mode
Target temperature
After 24 hour
Operation
temperature
32°F(0°C)
(For ASU*RLS2/ ASU*RLF1/ AGU*RLF type)
Powerful operation
Maximum
Powerful
Cooling/ Dry : 3, Heating : 5
=
=
Heating
50°F (10°C)
Auto
Economy
Operate as normal
Cooling/ Dry
Setting temp.+2°F(+1°C)
Release
temperature
39.2°F(4°C)
Heating
Setting temp.-2°F(-1°C)
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