Thermistor Characteristic Graph; Thermistor For Lower Temperature; Operation Summary Of The Linear Expansion Valve - Mitsubishi Electric Mr.Slim PUH-P25VGAA Service Manual

Split-type, heat pump air conditioners, r407c, outdoor unit
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<Thermistor characteristic graph>
Thermistor for
lower temperature
Thermistor R
=15k' ± 3%
0
Fixed number of B=3480 ± 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
higher temperature
Thermistor R120=7.465k' ±2%
Fixed number of B=4057 ±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
1
) }
273
Discharge temperature thermistor(TH4)
1
1
) }
273+t
393
[4
[3
[2
[1
50
40
30
20
10
0
500
400
300
200
100
0
Controller board
6
Brown
5
Red
4
Blue
3
Orange
2
Yellow
1
White
Connector(CNLEV)
51
< Thermistor for lower temperature >
-20 -10
0
10 20 30 40 50
Temperature (:)
< Thermistor for higher temperature >
50
75
100
25
Temperature (:)
DC12V
Drive circuit
[4
[3
[2
[1
120

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