Panasonic U-8MF2E8, Руководство по обслуживанию

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3WAY SYSTEM
Trouble Diagnosis
6. Inspection of Parts
Disconnect the CN3 connector (3P, WHT) 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.
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.
Disconnect the CN5 connector (3P, YEL) 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.
After removing the connector from the PCB, use the following methods to check the valves.
Measure the voltage between plug pin 5 and pins 1 through 4 at the CN64 connector (5P, WHT)
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 3, pin 6 – pin 2, pin 6 – pin 4) are
approximately 46Ω. (If the results are 0Ω or , replace the coil.)
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 3, pin 6 – pin 2, pin 6 – pin 4) are
approximately 46Ω. (If the results are 0Ω or
, replace the coil.)
Measure the voltage between plug pin 5 and pins 1 through 4 at the CN57 connector (5P, BLU)
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 3, pin 6 – pin 2, pin 6 – pin 4) are
approximately 46Ω. (If the results are 0Ω or , replace the coil.)
(1) High-pressure switch (63PH1, 63PH2, 63PH3)
(2) Electronic control valve (MOV1, MOV2, MOV4)
(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).)
63PH1
63PH2
63PH3
MOV1
MOV2
MOV4
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