Mitsubishi Electric PLFY-P20VEM-E Technical & Service Manual page 23

8-1-1. Thermistor
<Thermistor characteristic graph>
Thermistor for
Room temperature detection thermistor
lower temperature
(TH21)
Pipe temperature detection thermistor/liquid
(TH22)
Pipe temperature detection thermistor/gas
(TH23)
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 valves open/close through the use of a stepping motor after receiving the pulse signal from the indoor con-
troller 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
OCH657
1
) }
273
4 Blue
Brown
6
Yellow
2
3
50
40
30
20
10
0
Controller board
6
Brown
5
Red
4
Blue
3
Orange
2
Yellow
1
White
Connector(CN60)
23 23
< Thermistor for lower temperature >
-20 -10 0 10 20 30 40 50
Temperature (:)
DC12V
Drive circuit
[4
[3
[2
[1