Linear Expansion Valve - Mitsubishi Electric PLFY-P80VAM 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'
Thermistor for
drain sensor
Thermistor R =6.0k' ±5%
0
Fixed number of B=3390k' ±2%
Rt=15exp { 3390(
273+t
0: 6.0k'
10: 3.9k'
20: 2.6k'
25: 2.2k'
30: 1.8k'
40: 1.3k'

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
M
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 thermistor(TH22)
Gas pipe temperature thermistor(TH23)
1 1
) }
273
1 1
) }
273
Blue
4
[4
Brown
6
[3
Yellow
2
[2
3
[1
50
40
30
20
10
10
Relay connector
2
Brown
5 Red
1 Blue
Orange
3
Yellow
4
White
6
Connector(CN60)
16
< Thermistor for lower temperature >
0
-20 -10 0 10 20 30 40 50
Temperature (:)
< Thermistor for drain sensor >
9
8
7
6
5
4
3
2
1
0
-20 0 20 40 60 80
Temperature (:)
Controller board
DC12V
6
5
Drive circuit
[4
4
[3
3
[2
2
[1
1