Linear Expansion Valve - Mitsubishi Electric City Multi PKFY-P06NAMU-E Technical & Service Manual

<Thermistor characteristic graph>
Thermistor for
lower temperature
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'

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
M
6
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 color of
the lead wire.
Room temperature thermistor (TH21)
Liquid pipe temperature thermistor (TH22)
Gas pipe temperature thermistor (TH23)
1 1
) }
273
Blue
4
Brown
3
Yellow
2
1
50
40
30
20
10
0
-20
Brown
Red
Blue
Orange
Yellow
White
Connector(CN60)
33
< Thermistor for lower temperature >
0 20 40 60 80 100
Temperature (°F)
Controller board
DC12V
6
5
Drive circuit
4
4
3
3
2
2
1
1
120