20
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 thermistor (TH21)
Liquid pipe temperature thermistor (TH22)
Gas pipe temperature thermistor (TH23)
Thermistor R
0
=15k
'
± 3%
Fixed number of B=3480
± 2%
Rt=15exp { 3480( ) }
0
:
15k
'
10
:
9.6k
'
20
:
6.3k
'
25
:
5.2k
'
30
:
4.3k
'
40
:
3.0k
'
Thermistor for
lower temperature
Linear expansion valve
1
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 signal.
1
273+t
1
273
<Connection between the indoor controller board and the linear expansion valve>
OCH537
