Mitsubishi Electric PLFY-P20VBM-E.UK Technical & Service Manual page 27

9-1-1. Thermistor
<Thermistor characteristic graph>
Thermistor for
Room temperature detection thermistor (TH21)
lower temperature
Pipe temperature deection thermistor/ liquid (TH22)
Pipe temperature detection thermistor/ gas (TH23)
Thermistor R =15 kΩ ± 3%
0
Fixed number of B=3480 ± 2%
1
Rt=15exp { 3480(
273+t
0: 15 kΩ
10: 9.6 kΩ
20: 6.3 kΩ
25: 5.4 kΩ
30: 4.3 kΩ
40: 3.0 kΩ
9-1-2. 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
[2
[1 [3
5
1
Red
White
Orange
OCH413E
1
) }
273
4 Blue
Brown
6
Yellow
2
3
50
40
30
20
10
0
-20
Controller board
6
Brown
5
Red
4
Blue
3
Orange
2
Yellow
1
White
Connector(CN60)
27 27
< Thermistor for lower temperature >
-10 0 10 20 30 40 50
Temperature (:)
12V DC
Drive circuit
[4
[3
[2
[1