Service Manual

Control Specification SiUS041638E
43 Functions and Control
3.11 Electronic Expansion Valve Control
Outline The following items are included in the electronic expansion valve control.
Electronic expansion valve is fully closed
1. Electronic expansion valve is fully closed when turning on the power.
2. Pressure equalizing control
Open Control
1. Electronic expansion valve control when starting operation
2. Electronic expansion valve control when the frequency changes
3. Electronic expansion valve control for defrosting
4. Electronic expansion valve control when the discharge pipe temperature is abnormally high
5. Electronic expansion valve control when the discharge pipe thermistor is disconnected
Feedback Control
Target discharge pipe temperature control
Details The following are examples of electronic expansion valve control for each operation mode.
: Available
: Not available
Control
Status
Starting operation control
Control when the frequency changes
Target discharge pipe temperature control
Discharge pipe thermistor disconnection control
High discharge pipe temperature control
Defrost control (heating only)
Pressure equalizing control
Opening limit control
Power on ; Compressor stop Operation start Frequency change under starting control During target discharge pipe temperature control Frequency change under target discharge pipe temperature control Discharge pipe thermistor disconnection Frequency change under discharge pipe thermistor disconnection control During defrost control