Daikin FTXN25KEV1B Service Manual page 42

Control Specification
3.11.1 Fully Closing with Power ON
The electronic expansion valve is initialized when turning on the power. The opening position is
set and the pressure equalization is developed.
3.11.2 Pressure Equalization Control
When the compressor is stopped, the pressure equalization control is activated. The electronic
expansion valve opens, and develops the pressure equalization.
3.11.3 Opening Limit Control
Outline A maximum and minimum opening of the electronic expansion valve are limited.
Detail
Maximum opening (pulse)
Minimum opening (pulse)
The electronic expansion valve is fully closed when cooling operation stops, and is opened at
fixed degree during defrosting.
3.11.4 Starting Operation Control
The electronic expansion valve opening is controlled when the operation starts, and prevents
the superheating or liquid compression.
3.11.5 Control when the frequency changes
When the target discharge pipe temperature control is active, if the target frequency changes for
a specified value in a certain time period, the target discharge pipe temperature control is
canceled and the target opening of the electronic expansion valve is changed according to the
shift.
3.11.6 High Discharge Pipe Temperature Control
When the compressor is operating, if the discharge pipe temperature exceeds a certain value,
the electronic expansion valve opens and the refrigerant runs to the low pressure side. This
procedure lowers the discharge pipe temperature.
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SiBE041102_A
Function and Control