Mitsubishi Electric PLFY-P05NFMU-E Technical & Service Manual page 21

8-2-1. Thermistor Characteristic Graph
Thermistor characteristic graph
Room temperature detection thermistor (TH21)
Thermistor for
Pipe temperature detection thermistor/li uid (TH22)
lower temperature
Pipe temperature detection thermistor/gas (TH23)
Thermistor R 15 k"
0
Fixed number of B 3480
Rt 15exp 3480(
2 3+(t-32)/1.8
30 F 15.8 k"
50 F .6 k"
0 F 6.0 k"
80 F 4.8 k"
0 F 3. k"
100 F 3.2 k"
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
4
4
M
6
2
2
1 3
5
1
3
Red
White
Orange
Note : Since the order of connector numbers is different at the controller board side from the LEV side, see the colors of lead
wires to check the numbers.
OCH604A
3
2
1 1
)
2 3
Blue
4
Brown
3
Yellow
2
1
21
< Thermistor for lower temperature >
50
40
30
20
10
0
-20 0 20 40
Temperature (°F)
Controller board
DC12V
6
Brown
5
Red
Drive circuit
4
4
Blue
3
3
Orange
2
2
Yellow
1
1
White
Connector(CN60)
60 80 100 120