Linear Expansion Valve - Mitsubishi Electric PCFY-P40VKM-E Technical & Service Manual

8-1-1. Thermistor
<Thermistor characteristic graph>
Thermistor for
lower temperature
Thermistor R =15kΩ ± 3%
0
Fixed number of B=3480 ± 2%
1
Rt=15exp { 3480 (
273+t
0°C 15kΩ
10°C 9.6kΩ
20°C 6.3kΩ
25°C 5.4kΩ
30°C 4.3kΩ
40°C 3.0kΩ

Linear expansion valve

8-1-2.
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
M
ø1 ø3
5
1
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.
OCH449A
Room temperature thermistor (TH21)
Liquid pipe temperature thermistor (TH22)
Gas pipe temperature thermistor (TH23)
1
) }
273
4 Blue
ø4
Brown
6
ø2
Yellow
2
3
< Thermistor for lower temperature >
50
40
30
20
10
0
-20 -10
Controller board
DC12V
6
Brown
5
Red
4
Blue
3
Orange
2
Yellow
1
White
Connector (CN60)
22
0 10 20 30 40 50
Temperature (°C)
Drive circuit
ø4
ø3
ø2
ø1