Electronic Expansion Valve Control; Prevention To Restart For 3 Minutes (3 Minutes St); 4-Way Valve Control - Fujitsu ASUH09LPAS Service Manual

7-9. 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 below.
Operation mode
Cooling/dry mode
Heating mode
NOTE: At the time of supplying the power to the outdoor unit, the initialization of the electronic ex-
pansion valve is operated (528 pulses are input to the closing direction).

7-10. Prevention to restart for 3 minutes (3 minutes st)

When the compressor fails to start for the number of times below, it does not enter operation status
for 3 minutes.
• Model: AOUH09LPAS1
Retry number
Retry set number
• Model: AOUH12LPAS1
Retry number
Retry set number
When the compressor fails to start in the retry set number above, the compressor is stopped.

7-11. 4-way valve control

• If heating mode is selected at the compressor start, 4-way valve is energized for heating.
• When the air conditioner is switched between cooling and heating mode, compressor is stopped,
and the 4-way valve is switched when the 140 seconds passes and the compressor is started.
7-9. Electronic expansion valve control
Between 52 and 480 pulses
- (04-28) -
Pulse range
10
10
50
3
7. Various control