Trouble Criterion Of Main Parts - Mitsubishi Electric MUZ-GL09NA-U1 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)
OBH733D
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) -
MUY-GL09
MUZ-GL09NA(H) -
U1
U-V
U-W 1.26 - 1.72
V-W
Measure the resistance between lead wires using a tester.
[Temperature: 14 - 104°F (-10 - 40°C)]
Color of lead wire
MUZ-GL09/12/15
MUY-GL09/12/15
RED – BLK
BLK – WHT
WHT – RED
Measure the resistance using a tester.
[Temperature: 14 - 104°F (-10 - 40°C)]
Normal (kΩ)
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)
349 - 428
Normal (Ω)
U8
MUZ-GL15/18
MUZ-GL12
MUY-GL15/18
MUY-GL12
1.60 - 2.17 0.82 - 1.11
Normal (Ω)
MUZ-GL18/24
MUY-GL18/24
29 - 40 12 - 16
Normal (Ω)
37 - 54
48
Figure
WHT RED BLK
MUZ-GL24
MUY-GL24
V
0.87 - 1.18
WHT
RED BLK
V
WHT
ORN
RED
(+12V)
W
U
W
U
LEV