Simple Parts Check Method - Mitsubishi Electric PUH-P8MYA Technical & Service Manual

[4] Simple parts check method

• PUH-P8MYA/P10MYA
Part name
Thermistor (TH1) <Liquid
temperature detection>
Thermistor (TH2)
<Dischargetemperature
detection>
Thermistor (TH3) <Condenser/
evaporater temperature
detection>
Fan motor
Red
Thermal protector
trip temperature
135 ± 5˚C : ON
88 ± 5˚C : OFF
White
Blue
Compressor
Disconnect the connector and measure the resistance value with a multimeter.
(Ambient temperature 10 ˚C to 30 ˚C)
TH1, 3 4.3 kΩ~9.6 kΩ
TH2 160 kΩ~410 kΩ
Measure the resistance value across the terminals with a multimeter. (Winding
temperature 20 ˚C)
Motor lead wire
Between 2 phases
Black
Measure the resistance value across the terminals with a multimeter. (Winding
temperature 20 ˚C)
Normal
PUH-P8MYA
Each phase 1.574 Ω
PUH-P10MYA
Each phase 1.263 Ω
Judgment instructions
Normal Abnormal
Open or short
(Based on thermistor characteristic table (next page))
Normal Abnormal
45.5 Ω
Open or short
Abnormal
Open or short
Open or short
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