Linear Expansion Valve - Mitsubishi Electric PLFY-P32VBM-E Service Manual

9-1-1. Thermistor
<Thermistor characteristic graph>
Thermistor for
lower temperature
Thermistor R =15k' ± 3%
0
Fixed number of B=3480K ± 2%
1
Rt=15exp { 3480(
273+t
0: 15k'
10: 9.6k'
20: 6.3k'
25: 5.4k'
30: 4.3k'
40: 3.0k'
9-1-2.

Linear expansion valve

Operation summary of the linear expansion valve
• Linear expansion valves open/close through the use of a stepping motor after receiving the pulse signal from the indoor
controller board.
• Valve position can be changed in proportion to the number of pulse signals.
<Connection between the indoor controller board and the linear expansion valve>
Linear expansion valve
[4
M
[2
[1 [3
5
1
Red
White
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.
Room temperature thermistor(TH21)
Liquid pipe temperature thermistor(TH22)
Gas pipe temperature thermistor(TH23)
1
) }
273
4 Blue
Brown
6
Yellow
2
3
50
40
30
20
10
0
Controller board
Relay connector
2
Brown
5 Red
1
Blue
3
Orange
4 Yellow
6
White
Connector(CN60)
20
< Thermistor for lower temperature >
-20 -10 0 10 20 30 40 50
Temperature (:)
DC12V
6
5
Drive circuit
[4
4
[3
3
[2
2
[1
1