Trane Mitsubishi Electric CITY MULTI Series Technical & Service Manual page 32

9-1-1. Thermistor
<Thermistor characteristic graph>
Thermistor for
lower temperature
Thermistor R =15 k" ± 3%
0
Fixed number of B=3480 ± 2%
Rt=15exp { 3480(
273+(t-32)/1.8
30_F 15.8 k"
50_F 9.6 k"
70_F 6.0 k"
80_F 4.8 k"
90_F 3.9 k"
100_F 3.2 k"
9-1-2. Linear expansion valve
1 Operation summary of the linear expansion valve
• Linear expansion valve opens/closes through 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
5
1
RD
WH
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.
OCHT746A
Room temperature detection thermistor (TH21)
Pipe temperature detection thermistor/liquid (TH22)
Pipe temperature detection thermistor/gas (TH23)
1
1
) }
273
4 BU
ø4
BN
6
ø3
YE
2
ø2
3
OG
ø1
< Thermistor for lower temperature >
50
40
30
20
10
0
-20 0
Controller board
12 V DC
6
BN
5
RD
4
BU
3
OG
2
YE
1
WH
Connector(CN60)
32
20 40 60 80 100 120
Temperature (°F)
Drive circuit
ø4
ø3
ø2
ø1