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

[5] Simple parts check method

• PRH-P8MYA/P10MYA/P16MYA/P20MYA
Part name
Thermistor (TH1)
<Outdoor-side liquid
temperature detection>
Thermistor (TH2)
<Discharge temperature
detection>
Thermistor (TH3)
<Outdoor-side condenser/
evaporater temperature
detection>
Thermistor (TH4)
<Indoor-side intake
temperature>
Thermistor (TH5)
<Indoor-side unit piping
temperature>
Thermistor (TH6)
<Indoor-side unit condenser/
evaporater temperature>
Outdoor-side fan motor
Red
Thermal protector
trip temperature
135 ± 5˚C : ON
88 ± 5˚C : OFF
White
Blue
Indoor-side fan motor
Red
White Black
Compressor
Disconnect the connector and measure the resistance value with a multimeter.
(Ambient temperature 10 ˚C to 30 ˚C)
TH1, 3, 4, 5, 6
TH2
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)
Motor lead wire
Between 2 phases
Motor lead wire
Between 2 phases
Measure the resistance value across the terminals with a multimeter. (Winding
temperature 20 ˚C)
Normal
PRH-P8, 16MYA
Each phase 1.574 Ω
PRH-P10, 20MYA
Each phase 1.263 Ω
Judgment instructions
Normal Abnormal
4.3 kΩ~9.6 kΩ
Open or short
160 kΩ~410 kΩ
(Based on thermistor characteristic table (next page))
Normal Abnormal
45.5 Ω
Open or short
PRH-P8MYA PRH-P10MYA PRH-P16MYA PRH-P20MYA
13.2 Ω 10.2 Ω
PRH-P8, 10, 16, 20MYA
Open or short
Abnormal
Open or short
Open or short
- 53 -
Normal
6.4 Ω 3.4 Ω
Abnormal