Fujitsu AOUH09LPAS1, Service Manual

Page: 116 / 163

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 Pulse range
Cooling/dry mode
Between 52 and 480 pulses
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 10
Retry set number 10
• Model: AOUH12LPAS1
Retry number 50
Retry set number 3
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
- (04-28) -
7. Various control
CONTROL AND FUNCTIONS CONTROL AND FUNCTIONS