Linear Expansion Valve - Mitsubishi Electric PKFY-P20VAM Technical & Service Manual

<Thermistor Characteristic graph>
Thermistor for
lower temperature
Thermistor R =15k' ± 3%
0
Fixed number of B=3480k' ± 2%
Rt=15exp { 3480(
273+t
0: 15k'
10: 9.6k'
20: 6.3k'
25: 5.2k'
30: 4.3k'
40: 3.0k'

Linear expansion valve

Operation summary of the linear expansion valve.
• Linear expansion valve open/close through stepping motor after receiving the pulse signal from the indoor controller board.
• Valve position can be changed in proportion to the number of pulse signal.
<Connection between the indoor controller board and the linear expasion valve>
Linear expansion valve
Blue
4
Brown
M
6
Yellow
2
5
1
3
White Red
Orange
Note : Since the number of the connector at the controller board side and the relay connector are different, follow the color of
the lead wire.
12
Room temperature thermistor(TH21)
Liquid pipe thermistor(TH22)
Gas pipe thermistor(TH23)
Drain sensor(THD)
1 1
) }
273
[4
[3
[2
[1
< Thermistor for lower temperature >
50
40
30
20
10
0
-20 -10 0 10
Temperature (:)
Controller board
DC12V
6
Brown
5
Red
4
Blue
3
Orange
2
Yellow
1
White
Connector(CN60)
20 30 40 50
Drive circuit
[4
[3
[2
[1