23
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( ) }
30
_
F 15.8k
'
50
_
F 9.6k
'
70
_
F 6.0k
'
80
_
F 4.8k
'
90
_
F 3.9k
'
100
_
F 3.2k
'
Thermistor R
0
=6.0k
'
±5%
Fixed number of B=3390
± 2%
Rt=6exp { 3390( ) }
30
_
F 6.3k
'
50
_
F 3.9k
'
70
_
F 2.5k
'
80
_
F 2.0k
'
90
_
F 1.6k
'
100
_
F 1.3k
'
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.
<Connection between the indoor controller board and the linear expansion valve>
1
273+(t-32)/1.8
1
273
1
273+(t-32)/1.8
1
273
Thermistor for
drain sensor
0
10
20
30
40
50
0
-20
20
40
60
80
100
120
< Thermistor for lower temperature >
Temperature (°F)
Resistance (k
)
20
40
60
80
100
120
140 170
< Thermistor for drain sensor >
Temperature (°F)
0
1
2
3
4
5
6
7
8
9
10
Resistance (k
)
