Mitsubishi Electric PMFY-P20VBM-E1 Technical & Service Manual page 18

<Thermistor Characteristic graph>
Thermistor for
lower temperature
Thermistor R =15k' ± 3%
0
Fixed number of B=3480 ± 2%
Rt=15exp { 3480(
273+t
0: : 15k'
10: : 9.6k'
20: : 6.3k'
25: : 5.4k'
30: : 4.3k'
40: : 3.0k'
Thermistor for
lower temperature
Thermistor R =6.0k' ± 3%
0
Fixed number of B=3390 ± 2%
1
Rt=6exp { 3390(
273+t
0: : 6 k'
10: : 3.9k'
20: : 2.6k'
25: : 2.2k'
30: : 1.8k'
40: : 1.3k'
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>
Linear expansion valve
4 Blue
Brown
M
6
Yellow
5 2
1
3
Red
White
Orange
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.
Room temperature thermistor (TH21)
Liquid pipe temperature thermistor (TH22)
Gas pipe temperature thermistor (TH23)
1 1
) }
273
Drain sensor (DS)
1
) }
273
4
3
2
1
< Thermistor for lower temperature >
50
40
30
20
10
0
-20
< Thermistor for drain sensor >
10
9
8
7
6
5
4
3
2
1
0
Controller board
6
Brown
5
Red
4
Blue
3
Orange
2
Yellow
1
White
Connector (CN60)
18
-10 0 10 20 30 40 50
Temperature ( )
-20 0 20 40 60 80
Temperature ( )
DC12V
Drive circuit
4
3
2
1