Electronic Expansion Valve Control - Daikin CTXS09GVJU Service Manual

Control Specification

3.12 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
Room Distribution Control
1. Gas pipe isothermal control
2. SC control (only for heat pump Model)
3. Liquid pipe temperature control (with all ports connected and all rooms being air-conditioned)
4. Liquid pipe temperature control for stopped rooms
5. Dew prevention function for indoor motor
Open Control
1. Electronic expansion valve control when starting operation
2. Control when frequency changed
3. Control for defrosting (only for heat pump model)
4. Oil recovery control
5. Control when a discharge pipe temperature is abnormally high
6. Control when the discharge pipe thermistor is disconnected
7. Control for indoor unit freeze-up protection
Feedback Control
1. Discharge pipe temperature control
50
SiUS12-814
Function and Control