6
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6. Inspection and Characteristics of Parts
2WAY SYSTEM
Trouble Diagnosis
6
(1) High-Pressure Switch (63PH1, 63PH2, 63PH3), Optional High-Pressure Switch for Renewal (63PH4,63PH5)
63PH1
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.
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 , replace the coil.)
(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).)
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 , replace the coil.)
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
, replace the coil.)
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.)
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.)
63PH2
Measure the resistance between socket pins 1 and 3.
The resistance is OK if the result is 0 Ω.
63PH3
Measure the resistance between socket pins 1 and 3.
The resistance is OK if the result is 0 Ω.
63PH4
/63PH5
Disconnect the CN3 connector (3P, white) from the outdoor unit control panel.
Disconnect the CN4 connector (3P, red) from the outdoor unit control panel.
Disconnect the CN5 connector (3P, yellow) from the outdoor unit control panel.
Disconnect the CN42 connector (4P, white) from the outdoor unit control panel.
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.
SM830204-05_2WAY SYS.indb 31
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Summary of Contents for U-20ME1E81
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