Mitsubishi Electric PLFY Series Technical & Service Manual page 23

<Thermistor Characteristic Graph>
Thermistor for
lower temperature
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
Thermistor for
drain sensor
Thermistor R =6.0 kΩ ±5%
0
Fixed number of B=3390 ±2%
1
Rt=6exp { 3390(
273+t
0: 6.0 kΩ
10: 3.9 kΩ
20: 2.6 kΩ
25: 2.2 kΩ
30: 1.8 kΩ
40: 1.3 kΩ
60: 0.6 kΩ
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
White Red
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.
OCH569
Thermistor (TH21)
(Room temperature detection)
Thermistor (TH22)
(Pipe temperature detection/ Liquid)
Thermistor (TH23)
(Pipe temperature detection/ Gas)
1
) }
273
1
) }
273
Blue
4
[4
Brown
6
[3
Yellow
2
[2
3
[1
50
40
30
20
10
0
10
9
8
7
6
5
4
3
2
1
0
Controller board
6
Brown
5
Red
4
Blue
3
Orange
2
Yellow
1
White
Connector(CN60)
23
< Thermistor for lower temperature >
-20 -10 0 10 20 30 40 50
Temperature (:)
< Thermistor for drain sensor >
-20 0 20 40 60 80
Temperature (:)
DC12V
Drive circuit
[4
[3
[2
[1