49
5. HOW TO CHECK THE PARTS
Room temperature
thermistor (RT1)
Pipe temperature
thermistor (RT2)
Fan motor (MF)
Disconnect the connector, then measure the resistance using a tester.
(Surrounding temperature 50°F to 86°F)
Measure the resistance between the terminals using a tester.
(Surrounding temperature 68°F)
(Refer to the thermistor)
Normal
4.3k
'
to 9.6k
'
Abnormal
Open or short
Motor terminal
or
Relay connector
Normal
PKH
18,24FK3
Abnormal
Red-Black
107.4
'
i
10%
Open or short
White-Black
97.7
'
i
10%
1
1
3
3
5
5
Red
White
Black
Relay connector
Protector
Parts name
Check points
0
10
20
30
40
50
-4
14
32
50
68
86 104 122
< Thermistor for lower temperature >
Temperature (
°
F)
Resistance (K
"
)
<Thermistor Characteristic graph>
Room temperature thermistor(RT1)
Pipe temperature thermistor(RT2)
Thermistor R
0
=15k
'
± 3%
Fixed number of B=3480k
'
± 2%
Rt=15exp { 3480( ) }
32
°F
15k
'
50
°F
9.6k
'
68
°F
6.3k
'
77
°F
5.4k
'
86
°F
4.3k
'
104
°F
3.0k
'
Thermistor for
lower temperature
1
273+t
1
273
30,36FK3
69.7
'
i
10%
95.5
'
i
10%
Vane motor (MV)
Measure the resistance between the terminals using a tester.
(Surrounding temperature 68°F to 86°F)
Normal
186 to 214
'
Abnormal
Open or short
3 6 1
4
5
2
M
Pink
Connector
Red
Orange
Blue
Brown
Y
ellow
Brown-Yellow
Brown-Blue
Red-Orange
Red-Pink
Opening and closing temperature of protector.
Open: 266
i
41°F (Fan motor OFF)
Close: 176
i
68°F (Fan motor ON)
OC273-A-2.qxp 03.11.25 9:00 AM Page 49
Summary of Contents for Mr.Slim PKH36FK3
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