22
0
10
20
30
40
50
-20 -10
0
10 20
30
40
50
< Thermistor for lower temperature >
Temperature (°C)
Resistance (k
Ω
)
4
ø4
3
6
5
ø3
2
ø2
1
ø1
ø4
ø3
ø2
ø1
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
=15kΩ ± 3%
Fixed number of B=3480 ± 2%
Rt=15exp { 3480 ( ) }
0°C
15kΩ
10°C
9.6kΩ
20°C
6.3kΩ
25°C
5.4kΩ
30°C
4.3kΩ
40°C
3.0kΩ
Thermistor for
lower temperature
Linear expansion valve
Operation summary of the linear expansion valve
• Linear expansion valves open/close through the use of a 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
1
273
Note : Since the number of the connector at the controller board side and the relay connector are different, follow the color of
the lead wire.
8-1-1. Thermistor
8-1-2.
OCH449A
