Inspection And Characteristics Of Parts; Crankcase Heater; Electronic Control Valve (Mov1, Mov2, Mov4) - Panasonic U-8ME1E81 Service Manual

6. Inspection and Characteristics of Parts

6. Inspection of Parts
(1) High-Pressure Switch (63PH1, 63PH2, 63PH3), Optional High-Pressure Switch for Renewal (63PH4,63PH5)
63PH1 Disconnect the CN3 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 CN4 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 CN5 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.
63PH4 Disconnect the CN42 connector (4P, white) from the outdoor unit control panel.
/63PH5 Measure the resistance between socket pins 1 and 2. The resistance is OK if the result is 0 Ω.
Measure the resistance between socket pins 3 and 4. 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 CN64 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 CN63 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 CN57 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
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 0.1 A (198 V) – 0.2 A (264 V).)
, replace the coil.)
, replace the coil.)
, replace the coil.)
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2WAY SYSTEM
Trouble Diagnosis
2WAY SYSTEM
Trouble Diagnosis
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