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Control Specification SiUS091133
51 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
1. Target discharge pipe temperature control
Detail The followings are the examples of electronic expansion valve control which function in each
operation mode.
Cooling
−
h
−−−−−−
−−
h
−
h
−−−
−−−
h
−−−−
−−−−−
hh
−
−
hhhh
hhhhh
−−−
h
−−−−−−−
−
h
−
Heating
−
h
−−−−−−
−−
h
−
h
−−−
−−−
h
−−−−
−−−−−
hh
−
−
hhhh
−−−
−−−−−−−
h
h
−−−−−−−
−
hhhhhh
−
h : Holding Functions
— : No Functions
Starting control
Control when the frequency changes
Target discharge pipe temperature control
Control for disconnection of the discharge
pipe thermistor
High discharge pipe temperature control
Pressure equalizing control
Opening limit control
Starting control
Control when the frequency changes
Target discharge pipe temperature control
Control for disconnection of the discharge
pipe thermistor
High discharge pipe temperature control
Defrost control
Pressure equalizing control
Opening limit control
When the power turns on or when the
compressor stops
When the operation starts
When the frequency changes under
starting control
During target discharge pipe
temperature control
When the frequency changes under
target discharge pipe temperature control
When the disconnection of the discharge
pipe thermistor is ascertained
When the frequency changes under the control for
disconnection of the discharge pipe thermistor
Under defrost control
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