51
4
[
4
3
6
5
[
3
2
[
2
1
[
1
[
4
[
3
[
2
[
1
Controller board
Drive circuit
Connector(CNLEV)
DC12V
Brown
Red
Blue
Orange
Yellow
White
M
4
6
2
3
5
1
Blue
Brown
Yellow
Orange
Red
White
Linear expansion valve
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 controller board.
• Valve position can be changed in proportion to the number of pulse signal.
<Connection between the controller board and the linear expansion valve>
0
10
20
30
40
50
-20 -10
0
10 20 30
40 50
< Thermistor for lower temperature >
Temperature (
:
)
Resistance (k
"
)
500
400
300
200
100
0
25
50
75
100
120
< Thermistor for higher temperature >
Temperature (
:
)
Resistance (k
"
)
<Thermistor characteristic graph>
Liquid temperature thermistor(TH3)
Condenser/evaporator temperature
thermistor(TH6)
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
'
Discharge temperature thermistor(TH4)
Thermistor R120=7.465k
'
±2%
Fixed number of B=4057 ±2%
Rt=7.465exp { 4057( ) }
20
:
250k
'
30
:
160k
'
40
:
104k
'
50
:
70k
'
60
:
48k
'
70
:
34k
'
80
:
24k
'
90
:
17.5k
'
100
:
13.0k
'
110
:
9.8k
'
Thermistor for
lower temperature
1
273+t
1
273
1
273+t
1
393
Thermistor for
higher temperature
OC336--2.qxp 05.8.29 7:19 PM Page 51
