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5. HOW TO CHECK THE PARTS
Parts name
Room temperature
Disconnect the connector, then measure the resistance using a tester.
thermistor
(RT1)
(Surrounding temperature 50°F to 86°F)
Pipe temperature
thermistor
(RT2)
Fan motor (MF)
Measure the resistance between the terminals using a tester.
(Surrounding temperature 68°F)
Relay connector
1
Red
1
White
3
Relay connector
3
5
Black
5
Protector
Opening and closing temperature of protector.
Measure the resistance between the terminals using a tester.
Vane motor (MV)
(Surrounding temperature 68°F to 86°F)
Orange
4
Red
M
5
Pink
2
3 6 1
Connector
<Thermistor Characteristic graph>
Thermistor for
lower temperature
Thermistor R
=15k' ± 3%
0
Fixed number of B=3480k' ± 2%
Rt=15exp { 3480(
273+t
32
15k'
°F
50
9.6k'
°F
68
6.3k'
°F
77
5.4k'
°F
86
4.3k'
°F
104
3.0k'
°F
Normal
4.3k
to 9.6k
Open or short
'
'
Motor terminal
or
18,24FK3
Red-Black
107.4'i10%
White-Black
97.7'i10%
Open: 266i41°F (Fan motor OFF)
Close: 176i68°F (Fan motor ON)
Normal
Brown-Yellow
Brown-Blue
186 to 214
Red-Orange
Red-Pink
Room temperature thermistor(RT1)
Pipe temperature thermistor(RT2)
1
1
) }
273
Check points
Abnormal
(Refer to the thermistor)
Normal
PKH
30,36FK3
69.7'i10%
95.5'i10%
Abnormal
Open or short
'
50
40
30
20
10
0
49
Abnormal
Open or short
< Thermistor for lower temperature >
-4
14
32
50 68
86 104 122
Temperature (°F)
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