Mitsubishi Electric PKFY Series Technical & Service Manual page 14

<Thermistor Characteristic graph>
Thermistor for
lower temperature
Thermistor R =15k ± 3%
0
Fixed number of B=3480 ± 2%
Rt=15exp { 3480(
273+t
0ºC 15k
10ºC 9.6k
20ºC 6.3k
25ºC 5.4k
30ºC 4.3k
40ºC 3.0k
Linear expansion valve
Operation summary of the linear expansion valve
1
• 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
5 2
1
3
Red
White
Orange
OC310B
Room temperature thermistor(TH21)
Liquid pipe temperature thermistor (TH22)
Gas pipe temperature thermistor (TH23)
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)
14
0 10 20 30 40
Temperature (ºC)
DC12V
6
5
Drive circuit
4
4
3
3
2
2
1
1
50