Daikin K-Series Service Manual page 51

SiBE061121.book Page 41 Monday, April 25, 2011 3:20 PM
SiBE061121
3.11.1 Fully Closing with Power ON
The outdoor 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 Equalizing Control
When the compressor is stopped, the pressure equalization control is activated. The outdoor
electronic expansion valve opens, and develops the pressure equalization.
3.11.3 Opening Limit Control
Outline A maximum and minimum opening of the outdoor electronic expansion valve are limited.
Detail
Maximum opening (pulse)
Minimum opening (pulse)
The outdoor 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 outdoor 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 is changed
for a specified value in a certain time period, the target discharge pipe temperature control is
canceled and the target opening of the outdoor electronic expansion valve is changed according
to the shift.
3.11.6 High Discharge Pipe Temperature
When the compressor is operating, if the discharge pipe temperature exceeds a certain value,
the outdoor electronic expansion valve opens and the refrigerant runs to the low pressure side.
This procedure lowers the discharge pipe temperature.
Function and Control
25/35 class 50 class
480 480
52 54
Control Specification
41