Mitsubishi Electric TRANE TPKA0A0121HA70A Service Manual page 27

9-6. HOW TO CHECK THE PARTS
TPKA0A0121HA70A
Parts name
Room temperature
Disconnect the connector then measure the resistance with a tester.
thermistor (TH1)
(At the ambient temperature 50 to 86_F [10 to 30°C])
Pipe temperature
thermistor/liquid (TH2)
Condenser/evaporator
temperature thermistor
(TH5)
Vane motor (MV)
Measure the resistance between the terminals with a tester. (Coil temperature 77
Red
2
M
Yellow
4
Brown-Red
Brown
1
Orange
Green
Connect pin No. 5
3
Fan motor (MF)
Refer to "9-6-2. DC Fan motor (fan motor/indoor controller circuit board)".
9-6-1. Thermistor
<Thermistor characteristic graph>
Thermistor for
lower temperature
Thermistor R =15 k ± 3%
"
0
Fixed number of B=3480 ± 2%
t( )Rt=15exp { 3480(
32°F [0°C]
50°F [10°C]
68°F [20°C]
77°F [25°C]
86°F [30°C]
104°F [40°C]
OCHT637
TPKA0A0181HA70A
Normal Abnormal
4.3 to 9.6 k" Open or short
Normal
1-2 1-3 1-4
Brown-Orange Brown-Yellow
350 " ± 7%
Room temperature thermistor (TH1)
Pipe temperature thermistor/liquid (TH2)
Condenser/evaporator temperature
thermistor (TH5)
1 1
) }
273+t 273
1 1
T-32
273+ 273
1.8
15 k"
9.6 k"
6.3 k"
5.4 k"
4.3 k"
3.0 k"
Checkpoints
(Refer to "9-6-1. Thermistor".)
Abnormal
1-5
Brown-Green
Open or short
<Thermistor for lower temperature>
50
40
30
20
10
0
-20 -10 0 10 20 30 40 50
-4 -14 32 50 68 86 104122 °F
27
_F [25°C]
)
°C
Temperature