Mitsubishi Electric PKFY Series Technical & Service Manual page 12

<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'
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
Blue
4
Brown
M
6
Yellow
2
5
1
3
Red
White
Orange
OC179B
Room temperature thermistor (TH21)
Liquid pipe thermistor (TH22)
Gas pipe thermistor (TH23)
Drain sensor (THD)
1 1
) }
273
4
3
2
1
< Thermistor for lower temperature >
50
40
30
20
10
0
-20 -10
Controller board
Brown
Red
Blue
Orange
Yellow
White
Connector(CN60)
12
0 10 20 30 40 50
Temperature ( )
DC12V
6
5
Drive circuit
4
4
3
3
2
2
1
1