Daikin FTKD50BVM, Service Manual

Page: 65 / 210

Control Specification Si04-306
56 Function and Control
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
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
Detail The followings are the examples of control which function in each mode by the electronic
expansion valve control.
(R2833)
×
¡
¡
×
¡
¡
×
×
¡
×
×
×
×
¡
×
×
¡
×
×
×
×
×
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)
Pressure equalizing control
Open control when starting
Continue
Pressure equalizing control
Control when frequency changed Control for abnormally high discharge pipe temperature
When power is turned ON
Cooling operation
Stop
Heating operation
Stop
Heating operation
Control of discharge pipe
thermistor disconnection
Stop
Operation pattern
(only for heat
pump model)
(only for heat
pump model)
¡
: function
×
: not function
(only for heat pump model)