Outdoor Electronic Expansion Valve Control - Daikin K-Series Service Manual

SiBE061121.book Page 40 Monday, April 25, 2011 3:20 PM
Control Specification

3.11 Outdoor Electronic Expansion Valve Control

Outline The following items are included in the outdoor electronic expansion valve control.
Outdoor electronic expansion valve is fully closed.
1. Outdoor electronic expansion valve is fully closed when turning on the power.
2. Pressure equalizing control
Open Control
1. Outdoor electronic expansion valve control when starting operation
2. Outdoor electronic expansion valve control when the frequency changes
3. Outdoor electronic expansion valve control for defrosting
4. Outdoor electronic expansion valve control when the discharge pipe temperature is
5. Outdoor electronic expansion valve control when the discharge pipe thermistor is
Feedback Control
1. Target discharge pipe temperature control
Detail The followings are the examples of control which function in each mode by the outdoor
electronic expansion valve control.
40
abnormally high
disconnected
h : function
− : not function
Cooling
Starting control
Control when the frequency changes
Target discharge pipe temperature control
Control for disconnection of the discharge
pipe thermistor
High discharge pipe temperature control
Pressure equalizing control
Opening limit control
Heating
Starting control
Control when the frequency changes
Target discharge pipe temperature control
Control for disconnection of the discharge
pipe thermistor
High discharge pipe temperature control
Defrost control
Pressure equalizing control
Opening limit control
− h − − − −
− − − −
h h
− − − − −
h
− − − − −
h
− h h h h −
h − − − − −
− h h h h h
− − − − −
h
− − h − h −
− − − h − −
− − − − − h
− −
h h h h
− − − − − −
− − − − −
h
− h h h h h
Function and Control
SiBE061121
− −
− −
− −
−
h
− −
− −
h −
− −
− −
− −
h −
− −
−
h
− −
h −