
Control Specification SiBE04-624_B
64 Function and Control
2.12 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.
z
: Holding Functions
— : No Functions
Operation pattern Main control Secondary control
Control when the frequency changes
High discharge pipe temperature control
Power ON Power initialization control — —
Cooling operation Starting control —
z
Target discharge pipe
temperature control
zz
Stop Pressure equalizing control — —
Heating operation Starting control —
z
Target discharge pipe
temperature control
zz
Stop Pressure equalizing control — —
Operation with
discharge pipe
thermistor
disconnected
Starting control —
z
Target discharge pipe
temperature control
——
Stop Pressure equalizing control — —
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