Electronic Expansion Valve Control; Test Operation Control; Way Valve Extension Select; Auto Restart - Fujitsu ASTG18KMTC Service Instruction

10. 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 Table12.
The compressor frequency, the temperatures detected by the discharge temperature sensor, the
indoor heat exchanger sensor, the outdoor heat exchanger sensor,
and the outdoor temperature sensor.
Table12 : The pulse range of the electronic expansion valve control
Operation mode
Cooling / Dry mode
Heating mode
The expansion valve is set at 480 pulses after 110 seconds of stopping compressor.
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).

11. TEST OPERATION CONTROL

The outdoor unit, may not operate, depending on the room temperature.
In this case, keep on pressing the MANUAL AUTO button of the indoor unit for more than 10 seconds.
The operation indicator lamp and timer indicator lamp will begin to flash simultaneously
during cooling test run. Then, heating test run will begin in about 3 minutes when HEAT is selected
by the remote control operation. To end test operation, press the remote controller START/STOP button.

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

The compressor won't enter operation status for 3 minutes after the compressor is stopped,
even if any operation is given.

13. 4-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 4-way valve is switched in 3 minutes later
after the compressor stopped.

14. AUTO RESTART

When the power was interrupted by a power failure, etc. during operation, the operation contents
at that time are memorized and when power is recovered, operation is automatically started with
the memorized operation contents.
When the power is interrupted and recovered during timer operation, since the timer operation time
is shifted by the time the power was interrupted, an alarm is given by blinking (7 sec ON/2 sec OFF)
the indoor unit body timer lamp.
[Operation contents memorized when the power is interrupted]
Operation mode
Set temperature
Set air flow
Timer mode and timer time
Set air flow Direction
Swing
ECONOMY operation
10°C HEAT operation
Human sensor operation
Outdoor unit Low noise operation
Pulse range
between 0 to 480 pulses.
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