Mitsubishi Electric City Multi PLFY Series Technical & Service Manual page 20

8-2-1. Thermistor Characteristic Graph
Thermistor for
lower temperature
Thermistor R =15 kΩ ± 3%
0
Fixed number of B=3480 ± 2%
Rt=15exp { 3480(
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%
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
8-2-2. 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
M
[1
5
1
White Red
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.
TCH061
TCH061.indd 20 TCH061.indd 20
Thermistor (TH21)
(Room temperature detection)
Thermistor (TH22)
(Pipe temperature detection/Liquid)
Thermistor (TH23)
(Pipe temperature detection/Gas)
1 1
) }
273+t 273
1 1
) }
273
Blue
4
[4
[4
Brown
6
[2
[3
Yellow
2
[3
[2
3
Orange
[1
< Thermistor for lower temperature >
50
40
30
20
10
0
-20 -10 0
Temperature (:)
< Thermistor for drain sensor >
10
9
8
7
6
5
4
3
2
1
0
-20 0
Temperature (:)
Controller board
DC12V
6
Brown
5
Red
4
Blue
3
Orange
2
Yellow
1
White
Connector(CN60)
20
10 20 30 40 50
20 40 60 80
Drive circuit
[4
[3
[2
[1
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