Specifications

SiBE04-624 Control Specification
Function and Control 75
3.14 Electronic Expansion Valve Control
Outline The following items are included in the electronic expansion valve control.
Electronic expansion valve is fully closed

Electronic expansion valve is fully closed when turning on the power.

Pressure equalizing control
Open Control

Electronic expansion valve control when starting operation

Control when frequency changed

Control for defrosting (only for heat pump model)

Control when a discharge pipe temperature is abnormally high

Control when the discharge pipe thermistor is disconnected
Feedback Control

Discharge pipe temperature control

Maximum electronic expansion valve opening : 470 pulses

Minimum electronic expansion valve opening : 52 pulses
Detail The gray squares indicate which secondary functions are active or can be activated.
3.14.1 Power Initialization Control
Outline When turning on the power to the unit, the expansion valve is initialized to a certain starting
position.
Detail At initialization the following steps are executed.

The electronic expansion valve is closed by 700 pulses (to make sure it is closed shut).

After closing the valve, it is opened again by 400 pulses.
Operation pattern Main operation control
Control when frequency is changed
Control for abnormally high
discharge temperature
Power ON Power initialization control × ×
Cooling 1 room
operation
Control when starting ×
{
Control of target discharge
temp.
{ {
Stop Pressure equalization control × ×
Heating 1 room
operation
Control when starting × {
Control of target discharge
temp.
{ {
Stop Pressure equalization control × ×
Heating operation
discharge sensor
disconnected
Control when starting × {
Control of target discharge
temp.
××
Stop pressure equalization control × ×