Mitsubishi Electric Mr.SLIM PKA-A12GA Service Manual page 31

10-6. HOW TO CHECK THE PARTS
PKA-A12/ 18GA PKA-A24/ 30/ 36FA
PKA-A12/ 18GA PKA-A24/ 30/ 36FA
1
PKA-A12/ 18GA PKA-A24/ 30/ 36FA
2
Parts name
Room temperature Disconnect the connector then measure the resistance with a tester.
thermistor (TH1)
(At the ambient temperature 10 (50°F)~30 (86°F))
Pipe temperature
thermistor (TH2)
Condenser/evaporator
temperature thermistor
(TH5)
Measure the resistance between the terminals with a tester.
Fan motor (MF)
(Winding temperature 20 (68°F))
Relay connector
1
Red 1
White
2
2
3
Black
3
Protector
OFF:125 5
ON :79 15
(A12/ 18GA(L) only)
OFF:130 5
ON :80 20
(A24/ 30/ 36FA(L) only)
Measure the resistance between the terminals with a tester.
Vane motor (MV)
(At the ambient temperature 20 (68°F)~30 (86°F))
Orange
M
Red
Pink
Yellow Brown Blue
<Thermistor characteristic graph>
Thermistor for
lower temperature
Thermistor R =15k ± 3%
0
Fixed number of B=3480 ± 2%
t(:):Rt=15exp { 3480(
T(˚F):Rt=15exp { 3480(
0: (32˚F)
10: (50˚F)
20: (68˚F)
25: (77˚F)
30: (86˚F)
40:(104˚F)
1
2
Normal
4.3k ~9.6k Open or short
Motor terminal
or
PKA-A12, 18GA
Relay connector
PKA-A12, 18GAL
Red–Black
141.2
White–Black 131.5
Connector
Brown–Yellow
Brown–Blue
Red–Orange
Red–Pink
Room temperature thermistor(TH1)
Pipe temperature thermistor(TH2)
Condenser/evaporator temperature
thermistor(TH5)
1 1
) }
273+t
273
1 1
) }
T-32
273+
273
1.8
15k
9.6k
6.3k
5.4k
4.3k
3.0k
PKA-A12/ 18GAL
PKA-A12/ 18GAL
1
PKA-A12/ 18GAL
2
Check points
Abnormal
(Refer to Thermistor Characteristic graph.)
Normal
PKA-A24, 30FA
(1)(2)
PKA-A24, 30FAL
(1)(2)
107.4
97.7
Normal
Open or short
186~214
31
PKA-A24/ 30/ 36FAL
PKA-A24/ 30/ 36FAL
PKA-A24/ 30/ 36FAL
PKA-A36FA
(1)(2)
(1)(2)
PKA-A36FAL
(1)(2)
(1)(2)
69.7
95.5
Abnormal
50
40
30
20
10
0
-20 -10 0 10 20 30 40 50
-4 -14 32 50 68 86 104122 °F
Temperature
1
2
Abnormal
Open or short