Mitsubishi Electric City Multi PLFY-P08NCMU-E Technical & Service Manual page 23

<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
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
50
40
30
20
10
10
Brown
Red
Blue
Orange
Yellow
White
Connector (CN60)
23
< Thermistor for lower temperature >
0
-20 0 20 40 60 80 100
Temperature (°F)
< Thermistor for drain sensor >
9
8
7
6
5
4
3
2
1
0
20 40 60 80 100 120 140 170
Temperature (°F)
Controller board
DC12V
6
5
Drive circuit
4
4
3
3
2
2
1
1
120