Trouble Criterion Of Main Parts - Mitsubishi Electric American Standard Naxsks18A112Aa Service Manual

10-4. TROUBLE CRITERION OF MAIN PARTS

NAXSKS18A112AA
Part name
Defrost thermistor
Measure the resistance with a tester.
(RT61)
Refer to "Inverter P.C. board" in "10-6. TEST POINT DIAGRAM AND
Fin temperature
VOLTAGE", for the chart of thermistor.
thermistor (RT64)
Ambient temperature
thermistor (RT65)
Outdoor heat exchanger
temperature thermistor
(RT68)
Measure the resistance with a tester. Before measurement, hold the
thermistor with your hands to warm it up.
Discharge temperature
thermistor (RT62)
Refer to "Inverter P.C. board" in "10-6. TEST POINT DIAGRAM AND
VOLTAGE", for the chart of thermistor.
Measure the resistance between terminals with a tester.
(Temperature: 14 to 104 °F (-10 to 40 °C))
Compressor
Measure the resistance between lead wires with a tester.
(Temperature: 14 ~ 104 °F (-10 ~ 40 °C))
Outdoor fan motor
Measure the resistance with a tester.
(Temperature: 14 to 104 °F (-10 to 40°C))
R. V. coil (21S4)
Measure the resistance with a tester.
(Temperature: 14 ~ 104 °F (-10 ~ 40 °C))
Expansion valve coil
(LEV)
OCHA688D
NAXSKS24A112AA
Check method and criterion
NAXSKS18A112AA
U-V
U-W 0.82 to 1.11
V-W
Color of lead wire
NAXSKS
18A112AA
RD – BK
BK – WH 12 to 16
WH – RD
Normal (kΩ)
0.97 to 1.38
Color of lead wire Normal (Ω)
RD – OG
RD – WH
37 to 54
RD – BU
RD – YE
NAXSKS30A112AA
Normal (Ω)
NAXSKS24/30/36A112AA
0.83 to 1.03
Normal (Ω)
NAXSKS
24/30/36A112AA
12 to 17
19
NAXSKS36A112AA
Figure
WH RD BK
W
V
U
WH RD BK
WH
LEV
OG
RD
YE BU