Electronic Expansion Valve Control; Test Operation Control; Prevent To Restart For 3 Minutes ( 3 Minutes St ); Four-Way Valve Extension Select - Fujitsu ARU9RLF Service Instruction

9. ELECTRONIC EXPANSION VALVE CONTROL

The most proper opening of the electronic expansion valve is calculated and controlled under the present
operating condition based on the Table 14.
The compressor frequency, the detected temperature by the discharge temperature sensor,
the indoor heat exchanger sensor, the outdoor heat exchanger sensor, and the outdoor temperature sensor.
( Table 14 : The pulse range of the electronic expansion valve control )
AOU9RLFC
AOU12RLFC
AOU18RLFC
The expansion valve is set at 480 pulses 110seconds after the compressor had stopped.
Initialization will start after 24 hours pass from the last initialization, and the compressor stops
At the time of supplying the power to the outdoor unit, the initialization of the electronic
expansion valve is operated (528 pulses are input to the closing direction).

10. TEST OPERATION CONTROL

[ Wireless remote controller (Option) ]
Under the condition where the air conditioner runs, press the TEST RUN button of the remote control,
and the test operation control mode will appear.
During test running, the operation lamp and timer lamp of the air conditioner body twinkle simultaneously.
[ Wired remote controller ]
If the operation lamp is on, press the START/STOP button to turn it off.
Press the MODE and FAN buttons at the same time for more than two seconds
to start the test operation.
The operation lamp will light up and "o1" will be displayed on the set temperature display.
[ Release ]
Perform the test operation for 60 minutes.
Pressing the START/STOP button will stop the test operation.

11. PREVENT TO RESTART FOR 3 MINUTES ( 3 MINUTES ST )

The compressor won't enter operation status for 2 minutes and 20 seconds after the compressor is stopped,
even if any operation is given.

12. FOUR-WAY VALVE EXTENSION SELECT

At the time when the air conditioner is switched from the cooling mode to heating mode, the
compressor is stopped, and the four-way valve is switched in 2 minutes and 20 seconds later after
the compressor stopped.
Operation mode
Cooling / Dry mode Between 60 to 480 pulses.
Heating mode Between 45 to 480 pulses.
Cooling / Dry mode
Between 60 to 480 pulses.
Heating mode
Pulse range
01-12