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7-8. 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).

7-9. 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.

Retry number 50

Retry set number 3

When the compressor fails to start in the retry set number above, the compressor is stopped.

7-10. 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 3 minutes passes and the compressor is started.

200

1,500

200

2,000±100

Compressor

4-way valve

power supply

4-way valve

polarity

4-way valve

switching

Heating mode

Cooling mode

7-8. Electronic expansion valve control - (04-27) - 7. Various control

CONTROL AND

FUNCTIONS

CONTROL AND

FUNCTIONS

Fujitsu AOYG09KHCAN User Manual

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