30
4
[
4
3
6
5
[
3
2
[
2
1
[
1
[
4
[
3
[
2
[
1
Controller board
Drive circuit
Connector(CN60)
12 V DC
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 detection thermistor (TH21)
Pipe temperature detection thermistor/liquid (TH22)
Pipe temperature detection thermistor/gas (TH23)
Thermistor R
0
=15 k
"
± 3%
Fixed number of B=3480
± 2%
Rt=15exp { 3480( ) }
30
_
F 15.8 k
"
50
_
F 9.6 k
"
70
_
F 6.0 k
"
80
_
F 4.8 k
"
90
_
F 3.9 k
"
100
_
F 3.2 k
"
Thermistor for
lower temperature
9-1-2. Linear expansion valve
1
Operation summary of the linear expansion valve
• Linear expansion valve opens/closes 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
"
)
9-1-1. Thermistor
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.
OCH611D
