27
OCH728A
27
0
10
20
30
40
50
-20 -10
0
10 20
30
40
50
< Thermistor for lower temperature >
Temperature (
:
)
Resistance (k
"
)
4
[
4
3
6
5
[
3
2
[
2
1
[
1
[
4
[
3
[
2
[
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 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 ( ) }
0
:
15 k
"
10
:
9.6 k
"
20
:
6.3 k
"
25
:
5.4 k
"
30
:
4.3 k
"
40
:
3.0 k
"
Thermistor for
lower temperature
1
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 con-
troller 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
8-1-1. Thermistor
8-1-2. Linear expansion valve
