Electronic Expansion Valve Control - Daikin FTKS20CVMB Service Manual

Control Specification

3.11 Electronic Expansion Valve Control

The following items are included in the electronic expansion valve control.
Outline
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. Control when frequency changed
3. Control for defrosting (only for heat pump model)
4. Control when a discharge pipe temperature is abnormally high
5. Control when the discharge pipe thermistor is disconnected
Feedback Control
1. Discharge pipe temperature control
The followings are the examples of control which function in each mode by the electronic
Detail
expansion valve control.
66
Operation pattern
When power is turned ON
Cooling operation
Stop
Heating operation
(only for heat
pump model)
Stop
Heating operation
(only for heat
pump model)
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)
(Defrost control FD=1)
(only for heat pump model)
Pressure equalizing control
Open control when starting
Continue
Pressure equalizing control
SiENBE04-401A
x x
x
x x
x
x x
x x
x
x x
x x
(R2833)
Function and Control