Mitsubishi Electric PFFY-P20VLEM-A Technical & Service Manual page 14

<Thermistor Characteristic graph>
Thermistor for
lower temperature
Thermistor R =15kΩ ± 3%
0
Fixed number of B=3480kΩ ± 2%
Rt=15exp { 3480(
273+t
0°C 15kΩ
10°C 9.6kΩ
20°C 6.3kΩ
25°C 5.2kΩ
30°C 4.3kΩ
40 3.0kΩ
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 expasion valve>
Linear expansion valve
Blue
4
Brown
M
6
Yellow
2
5
1
3
Red
White
Orange
13
Room temparature thermistor(TH21)
Liquid pipe thermistor(TH22)
Gas pipe temparature thermistor(TH23)
Drain sensor(DS)
1 1
) }
273
ø4
ø3
ø2
ø1
< Thermistor for lower temperature >
50
40
30
20
10
0
-20 -10 0
Temperature (: )
Controller board
DC12V
6
Brown
5
Red
4
Blue
3
Orange
2
Yellow
1
White
Connector(CN60)
10 20 30 40 50
Drive circuit
ø4
ø3
ø2
ø1