22
4
Φ
4
3
6
5
Φ
3
2
Φ
2
1
Φ
1
Φ
4
Φ
3
Φ
2
Φ
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 temperature thermistor (TH21)
Liquid pipe temperature thermistor (TH22)
Gas pipe temperature thermistor (TH23)
Thermistor R
0
=15k
Ω
± 3%
Fixed number of B=3480 ± 2%
Rt=15exp { 3480( ) }
30°F
15.8k
Ω
50°F
9.6k
Ω
70°F
6.0k
Ω
80°F
4.8k
Ω
90°F
3.9k
Ω
100°F 3.2k
Ω
Thermistor for
lower temperature
8-1-2. Linear expansion valve
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 (k
Ω
)
8-1-1. Thermistor
OCH500A
