Electronic Expansion Valve Control - Daikin SiBE04-624_B_FTXR-E Service Manual

Control Specification

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