Daikin FTXS09HVJU, Service Manual

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SiUS04-904 Control Specification (15/18/24 Class)
Function and Control 57
4.12 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 frequency changed
3. Electronic expansion valve control for defrosting
4. Electronic expansion valve control when a 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 following are the examples of control functioning 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

: function
×
: not function