Linear Expansion Valve - Mitsubishi Electric PU-P3VGAAPUH-P3YGAA PU-P3YGAAPUH-P4VGAA PU-P4VGAAPUH-P4YGAA PU-P4YGAAPUH-P5YGAA PU-P5YGAAPUH-P6YGAA PU-P6YGAA Technical & Service Manual

<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: 5.2k'
30: 4.3k'
40: 3.0k'
Thermistor for
higher temperature
Thermistor R120=7.465k' ±2%
Fixed number of B=4057k' ±2%
Rt=7.465exp { 4057(
20: 250k'
30: 160k'
40: 104k'
50: 70k'
60: 48k'
70: 34k'
80: 24k'
90: 17.5k'
100: 13.0k'
110: 9.8k'

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 controller board.
• Valve position can be changed in proportion to the number of pulse signal.
<Connection between the controller board and the linear expansion valve>
Linear expansion valve
Blue
4
Brown
M 6
Yellow
2
5
1
3
Red
White
Orange
Liquid temperature thermistor(TH3)
Condenser/evaporator temperature
thermistor(TH6)
1
) }
273
Discharge temperature thermistor(TH4)
1 1
) }
273+t
393
[4
[3
[2
[1
< Thermistor for lower temperature >
50
40
30
20
10
0
-20 -10
< Thermistor for higher temperature >
500
400
300
200
100
0
25
Controller board
DC12V
6
Brown
5
Red
Drive circuit
[4
4
Blue
[3
3
Orange
[2
2
Yellow
[1
1
White
Connector(CNLEV)
34
0 10 20 30 40 50
Temperature (:)
50 75 100 120
Temperature (:)