Linear Expansion Valve - Mitsubishi Electric PKFY-P32VGM-A 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 expansion valve>
Linear expansion valve
Blue
4
Brown
M
6
Yellow
2
5
1
3
Red
White
Orange
Room temperature thermistor(TH21)
Liquid pipe temperature thermistor (TH22)
Gas pipe temperature thermistor (TH23)
1 1
) }
273
[4
[3
[2
[1
< Thermistor for lower temperature >
50
40
30
20
10
0
-20
Controller board
6
Brown
5
Red
4
Blue
3
Orange
2
Yellow
1
White
Connector(CN60)
12
-10 0 10 20 30 40
Temperature (:)
DC12V
Drive circuit
[4
[3
[2
[1
50