Linear Expansion Valve - Mitsubishi City Multi Series PLFY-P08NCMU-E Technical & Service Manual

<Thermistor characteristic graph>
Thermistor for
lower temperature
Thermistor R =15k' ± 3%
0
Fixed number of B=3480 ± 2%
Rt=15exp { 3480(
273+(t-32)/1.8
30_F 15.8k'
50_F 9.6k'
70_F 6.0k'
80_F 4.8k'
90_F 3.9k'
100_F 3.2k'
Thermistor for
drain sensor
Thermistor R =6.0k' ±5%
0
Fixed number of B=3390 ± 2%
Rt=6exp { 3390(
273+(t-32)/1.8
30_F 6.3k'
50_F 3.9k'
70_F 2.5k'
80_F 2.0k'
90_F 1.6k'
100_F 1.3k'

Linear expansion valve

1 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
White Red
Orange
OCH410D
Room temperature thermistor(TH21)
Liquid pipe temperature thermistor(TH22)
Gas pipe temperature thermistor(TH23)
1 1
) }
273
1 1
) }
273
Blue
4
4
Brown
6
3
Yellow
2
2
3
1
< Thermistor for lower temperature >
50
40
30
20
10
0
-20 0
< Thermistor for drain sensor >
10
9
8
7
6
5
4
3
2
1
0
20
Controller board
DC12V
6
Brown
5
Red
4
Blue
3
Orange
2
Yellow
1
White
Connector (CN60)
24
20 40 60 80 100 120
Temperature (°F)
40 60 80 100 120 140 170
Temperature (°F)
Drive circuit
4
3
2
1