Daikin FTXM-V Series Service Manual page 77

SiUS042113E
3.13.1 Initialization as Power Supply On
The electronic expansion valve is initialized (fully closed) when the power is turned on. Then, the
valve opening position is set and the pressure is equalized.
3.13.2 Pressure Equalizing Control
When the compressor is stopped, the pressure equalizing control is activated. The electronic
expansion valve opens, and develops the pressure equalization.
3.13.3 Opening Limit Control
The maximum and minimum opening of the electronic expansion valve are limited.
Maximum opening (pulse)
Minimum opening (pulse)
The electronic expansion valve is fully closed when cooling operation stops, and is controlled at a
fixed opening during defrosting.
3.13.4 Starting Operation Control
The electronic expansion valve opening is controlled when the operation starts, thus preventing
superheating or liquid compression.
3.13.5 Control when the Frequency Changes
When the target discharge pipe temperature control is active, if the target frequency changes to 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 frequency
shift.
3.13.6 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.
Part 4 Functions and Control
09/12 class 18/24 class
470 490
30 40
Control Specification
73