Mitsubishi Electric PKFY Series Technical & Service Manual page 26

8-1-1. Thermistor
<Thermistor characteristic graph>
Thermistor for
lower temperature
Thermistor R =15 k" ± 3%
0
Fixed number of B=3480 ± 2%
1
Rt=15exp { 3480(
273+t
0: 15 k"
10: 9.6 k"
20: 6.3 k"
25: 5.4 k"
30: 4.3 k"
40: 3.0 k"
8-1-2. Linear expansion valve
1 Operation summary of the linear expansion valve
• Linear expansion valve opens/closes 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
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.
OCH710
Room temperature detection thermistor (TH21)
Pipe temperature detection thermistor/liquid (TH22)
Pipe temperature detection thermistor/gas (TH23)
1
) }
273
[4
[3
[2
[1
< Thermistor for lower temperature >
50
40
30
20
10
0
-20 -10
Controller board
6
Brown
5
Red
4
Blue
3
Orange
2
Yellow
1
White
Connector(CN60)
26
0 10 20 30 40 50
Temperature (:)
12 V DC
Drive circuit
[4
[3
[2
[1