Inspection Of Parts - Panasonic U-8ME1E8E Service Manual

6. Inspection of Parts

(1) High-pressure switch (63PH1, 63PH2, 63PH3)
63PH1 Disconnect the CN033 connector (3P, white) from the outdoor unit control panel.
Measure the resistance between socket pins 1 and 3.
The resistance is OK if the result is 0 Ω.
63PH2 Disconnect the CN031 connector (3P, red) from the outdoor unit control panel.
Measure the resistance between socket pins 1 and 3.
The resistance is OK if the result is 0 Ω.
63PH3 Disconnect the CN032 connector (3P, yellow) from the outdoor unit control panel.
Measure the resistance between socket pins 1 and 3.
The resistance is OK if the result is 0 Ω.
(2) Electronic control valve (MOV1, MOV2, MOV4)
After removing the connector from the PCB, use the following methods to check the valves.
MOV1 Measure the voltage between plug pin 5 and pins 1 through 4 at the CN079 connector (5P, white)
on the outdoor unit control PCB.
(Because of the pulse output, a simplified measurement method is used.
Set the tester to the 12 V range; if the value displayed is approximately 4 V, then the voltage
is normal.)
When the voltage is normal, measure the resistance between each pair of pins on the electronic
control valve connector.
The connector is normal if all results (pin 5 – pin 1, pin 5 – pin 2, pin 5 – pin 3, pin 5 – pin 4)
are approximately 46Ω. (If the results are 0Ω or
MOV2 Measure the voltage between plug pin 5 and pins 1 through 4 at the CN080 connector (5P, red)
on the outdoor unit control PCB.
(Because of the pulse output, a simplified measurement method is used.
Set the tester to the 12 V range; if the value displayed is approximately 4 V, then the voltage
is normal.)
When the voltage is normal, measure the resistance between each pair of pins on the electronic
control valve connector.
The connector is normal if all results (pin 5 – pin 1, pin 5 – pin 2, pin 5 – pin 3, pin 5 – pin 4)
are approximately 46Ω. (If the results are 0Ω or
MOV4 Measure the voltage between plug pin 5 and pins 1 through 4 at the CN082 connector (5P, blue)
on the outdoor unit control PCB.
(Because of the pulse output, a simplified measurement method is used.
Set the tester to the 12 V range; if the value displayed is approximately 4 V, then the voltage
6
is normal.)
When the voltage is normal, measure the resistance between each pair of pins on the electronic
control valve connector.
The connector is normal if all results (pin 5 – pin 1, pin 5 – pin 2, pin 5 – pin 3, pin 5 – pin 4)
are approximately 46Ω. (If the results are 0Ω or
(3) Crankcase heater
• Connect a clamp meter to 1 of the 2 crankcase heater wires and measure the current.
The current is normal if the result is 0.15 A or higher.
(As a guide, the current should be 0.14 A (180 V) – 0.17 A (220 V).)
, replace the coil.)
, replace the coil.)
, replace the coil.)
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Trouble Diagnosis