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30
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50
-20 -10 0 10 20 30 40 50
< Thermistor for lower temperature >
Temperature
(˚C)
-4 14 32 50 68 86 104 122
[˚F]
Resistance (kΩ )
4
ø
4
3
6
5
ø
3
2
ø
2
1
ø
1
ø
4
ø
3
ø
2
ø
1
Controller board
Drive circuit
Connector(CN60)
DC12V
Brown
Red
Blue
Orange
Yellow
White
M
4
6
2
3
5
1
Blue
Brown
Yellow
Orange
Red
White
Linear expansion valve
<Thermistor Characteristic graph>
Room temparature thermistor(TH21)
Liquid pipe thermistor(TH22)
Gas pipe temparature thermistor(TH23)
Drain sensor(DS)
Thermistor R
0=15kΩ±3%
Fixed number of B=3480kΩ±2%
Rt=15exp { 3480( ) }
0˚C 15kΩ
10˚C 9.6kΩ
20˚C 6.3kΩ
25˚C 5.2kΩ
30˚C 4.3kΩ
40˚C
32˚F
50˚F
68˚F
77˚F
86˚F
104˚F 3.0kΩ
Thermistor for
lower temperature
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>
1
273+t
1
273