Trouble Criterion Of Main Parts - Mitsubishi Electric MUZ-GL09NA-U8 Service Manual

10-4. TROUBLE CRITERION OF MAIN PARTS

MUZ-GL09NA MUZ-GL09NAH MUY-GL09NA
MUZ-GL12NA MUZ-GL12NAH MUY-GL12NA
MUZ-GL15NA MUZ-GL15NAH MUY-GL15NA
MUZ-GL18NA MUZ-GL18NAH MUY-GL18NA
MUZ-GL24NA MUZ-GL24NAH MUY-GL24NA
Part name
Defrost thermistor (RT61)
(MUZ)
Fin temperature
thermistor (RT64)
Ambient temperature ther-
mistor (RT65)
Outdoor heat exchanger tem-
perature thermistor (RT68)
Discharge temperature ther-
mistor (RT62)
Compressor
Outdoor fan motor
R. V. coil (21S4)
Expansion valve coil (LEV)
Defrost heater
(MUZ-GL·NAH)
OBH733G
Check method and criterion
Measure the resistance with a tester.
Refer to 10-6. "Test point diagram and voltage", 1. "Inverter P.C. board",
for the chart of thermistor.
Measure the resistance with a tester. Before measurement, hold the
thermistor with your hands to warm it up.
Refer to 10-6. "Test point diagram and voltage", 1. "Inverter P.C. board",
for the chart of thermistor.
Measure the resistance between terminals using a tester.
[Temperature: 14 - 104°F (-10 - 40°C)]
-
MUZ-GL09NA(H) MUZ-GL09NA(H)
U1
-
MUY-GL09NA MUY-GL09NA
U1
U-V
1.26 - 1.72 1.59 - 2.16
U-W
V-W
Measure the resistance between lead wires using a tester.
[Temperature: 14 - 104°F (-10 - 40°C)]
MUZ-GL09/12/15-
Color of lead wire
MUY-GL09/12/15-
MUZ-GL09NA-
RED – BLK
29 - 40
BLK – WHT
WHT – RED
Measure the resistance using a tester.
[Temperature: 14 - 104°F (-10 - 40°C)]
MUZ-GL09/12NA(H)-
U1
MUZ-GL15/18/24NA(H)
0.97 - 1.38
Measure the resistance using a tester.
[Temperature: 14 - 104°F (-10 - 40°C)]
Color of lead wire
RED – ORN
RED – WHT
RED – BLU
RED – YLW
Measure the resistance using a tester.
[Temperature: 14 - 104°F (-10 - 40°C)]
Normal (Ω)
GL09/12/15
349 - 428
Normal (Ω)
-
MUZ-GL09NA(H)
- U8
U2 MUZ-GL15/18
MUZ-GL12
- MUY-GL15/18
U2
MUY-GL12
1.60 - 2.17 0.82 - 1.11 0.87 - 1.18
Normal (Ω)
U1
MUZ-GL09/12/15-
U2
U1
MUY-GL09/12/15-
U2
U8
28 - 39
Normal (kΩ)
,
U8
MUZ-GL09/12NA(H)-
1.65 - 2.48
Normal (Ω)
37 - 54
GL18/24
376 - 461
48
Figure
WHT RED BLK
MUZ-GL24
MUY-GL24
V
WHT RED BLK
MUZ-GL18/24
MUY-GL18/24
V
12 - 16
U2
WHT
ORN
RED
(+12V)
W
U
W
U
LEV