Control Specification SiMT041509E
41 Function 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
Detail The followings are the examples of electronic expansion valve control which function in 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
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