Service manual

2323
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 R0=15k' ± 3%
Fixed number of B=3480 ± 2%
Rt=15exp { 3480( ) }
0: : 15k'
10: : 9.6k'
20: : 6.3k'
25: : 5.4k'
30: : 4.3k'
40: : 3.0k'
Drain sensor (DS)
Thermistor R
0=6.0k' ± 3%
Fixed number of B=3390 ± 2%
Rt=6exp { 3390( ) }
0: : 6 k'
10: : 3.9k'
20: : 2.6k'
25: : 2.2k'
30: : 1.8k'
40: : 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
1
273
Note : Since the number of the connector at the controller board side and the relay connector are different, follow the colour of
the lead wire.
-20 0 20 40 60 80
< Thermistor for drain sensor >
Temperature ()
0
1
2
3
4
5
6
7
8
9
10
Resistance (k)
1
273+t
1
273
Thermistor for
lower temperature
OC307E