21
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
Linear expansion valve11Operation 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
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>
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.
<Thermistor characteristic graph>
Thermistor <Room temperature detection> (TH21)
Thermistor <Liquid pipe temperature detection> (TH22)
Thermistor <Gas pipe temperature detection> (TH23)
Thermistor R0=15k' ±3%
Fixed number of B=3480K ± 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'
Drain sensor (DS)
Thermistor R0=6.0k' ±5%
Fixed number of B=3390K ±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'
140_F 0.6k'
Thermistor for
lower temperature
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")
OC341B--1.qxp 07.7.11 1:29 PM Page 21