Linear Expansion Valve - Mitsubishi Electric PMFY-P06NBMU-E Technical & Service Manual

<Thermistor characteristic graph>
Thermistor for
Thermistor <Room temperature detection> (TH21)
lower temperature
Thermistor <Liquid pipe temperature detection> (TH22)
Thermistor <Gas pipe temperature detection> (TH23)
Thermistor R =15k' ± 3%
0
Fixed number of B=3480 ± 2%
Rt=15exp { 3480(
273+(t-32)/1.8
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 for
Drain sensor (DS)
drain sensor
Thermistor R =6.0k' ±5%
0
Fixed number of B=3390 ±2%
Rt=6exp { 3390(
273+(t-32)/1.8
30_F 6.3k' 90_F
50_F 3.9k' 100_F
70_F 2.5k' 140_F
80_F 2.0k'

Linear expansion valve

1 Operation 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>
Linear expansion valve
4
M
6
2
5
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 color of
the lead wire.
OC341F
1 1
) }
273
1
1
) }
273
1.6k'
1.3k'
0.6k'
Blue
4
Brown
3
Yellow
2
1
Brown
Red
Blue
Orange
Yellow
White
Connector (CN60)
23
< Thermistor for lower temperature >
50
40
30
20
10
0
-20 0 20 40 60 80 100
Temperature (˚F)
< Thermistor for drain sensor >
10
9
8
7
6
5
4
3
2
1
0
20 40 60 80 100 120 140 170
Temperature (°F)
Controller board
DC12V
6
5
Drive circuit
4
4
3
3
2
2
1
1
120