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4
Φ4
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Controller board
Drive circuit
Connector(CN60)
DC12V
Brown
Red
Blue
Orange
Yellow
White
M
4
6
2
3
5
1
Blue
Brown
Yellow
Orange
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White
Linear expansion valve
<Thermistor characteristic graph>
Room temperature thermistor (TH21)
Liquid pipe temperature thermistor (TH22)
Gas pipe temperature thermistor (TH23)
Thermistor R0=15kΩ ± 3%
Fixed number of B=3480 ± 2%
Rt=15exp { 3480( ) }
30°F 15.8kΩ
50°F 9.6kΩ
70°F 6.0kΩ
80°F 4.8kΩ
90°F 3.9kΩ
100°F 3.2kΩ
Thermistor for
lower temperature
Linear expansion valve
7-1-2.
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 signals.
<Connection between the indoor controller board and the linear expansion valve>
1
273+(t-32)/1.8
1
273
0
10
20
30
40
50
0-20 20 40 60 80 100 120
< Thermistor for lower temperature >
Temperature (°F)
Resistance (kΩ)
7-1-1. Thermistor