Electronic Expansion Valve Control - Daikin FTXS20G2V1B Service Manual

SiENBE04-808_A

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 frequency changed
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. Discharge pipe temperature control
Detail
The followings are the examples of control which function in each mode by the electronic
expansion valve control.
Function and Control
Operation pattern
When power is turned ON
Cooling operation
Stop
Heating operation
Stop
Heating operation
Control of discharge pipe
thermistor disconnection
Stop
: function
X : not function
Fully closed when power is turned ON
Open control when starting
(Control of target discharge pipe
temperature)
Pressure equalizing control
Open control when starting
(Control of target discharge pipe
temperature)
Pressure equalizing control
Open control when starting
Continue
Pressure equalizing control
Control Specification
X X
X
X X
X
X X
X X
X
X X
X X
(R2833)
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