How To Check The Parts; Fan Motor (Mf); Vane Motor (Mv); Thermistor Characteristic Graph - Mitsubishi Electric Mr.Slim PKH18FL Technical & Service Manual

4. 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.
Relay connector
1
Red 1
Relay connector
White
3
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
18,24FL
Red-White 99.5'i10%
White-Black
103.5'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
30,36FL
62.6'i10%
74.0'i10%
Abnormal
Open or short
'
50
40
30
20
10
0
44
Abnormal
Open or short
< Thermistor for lower temperature >
-4 14 32 50 68 86 104 122
Temperature (°F)