Troubleshooting - Mitsubishi Electric PAC-MK53BC Technical & Service Manual

7

TROUBLESHOOTING

7-1. HOW TO CHECK THE PARTS
BRANCH BOX : PAC-MK53BC
PAC-MK53BCB
Parts name
Thermistor (TH-A–E)
<Gas pipe>
Linear expansion valve
( LEV-A–E )
Red Red Red Red Red Red Red Red Red Red Red Red
M M M M M M M M M M M M
1 1 1 1 1 1 1 1 1 1 1 1
Blue Blue Blue Blue Blue Blue Blue Blue Blue Blue Blue Blue
2 2 2 2 2 2 2 2 2 2 2 2
Orange Orange Orange Orange Orange Orange Orange Orange Orange Orange Orange Orange
3 3 3 3 3 3 3 3 3 3 3 3
Yellow Yellow Yellow Yellow Yellow Yellow Yellow Yellow Yellow Yellow Yellow Yellow
4 4 4 4 4 4 4 4 4 4 4 4
White White White White White White White White White White White White
5 5 5 5 5 5 5 5 5 5 5 5
OCH664
PAC-MK33BC
PAC-MK33BCB
Disconnect the connector then measure the resistance with a tester.
(At the ambient temperature 10 to 30°C)
Thermistor R =15k" ± 3%
0
Fixed number of B=3480 ± 2%
1
Rt=15exp { 3480( ) }
273+t
10: 9.7 k"
15: 7.9 k"
20: 6.4 k"
25: 5.3 k"
30: 4.4 k"
Disconnect the connector then measure the resistance with a tester.
(Winding temperature 20°C)
Red - White Red - Orange
Check points
< Thermistor for lower temperature >
12
1
273
10
8
6
4
2
0
10
Normal
Red - Yellow
46 ± 4Ω
17
15 20 25
Temperature (:)
Abnormal
Red - Blue
Open or short
30