6 - 27
5. Inspection and Characteristics of Parts
2WAY SYSTEM
Trouble Diagnosis
6
(1) High-Pressure Switch (63PH1, 63PH2)
63PH1
and
63PH2
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
•
Check the resistance of crankcase heater using a tester.
Under the value under the temperature 20°C, the result shows 1763 ± 7% Ω.
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.)
Disconnect the CN69 connector (3P, white) from the outdoor unit control panel.
SM830253-00_欧州2way7_SM-TRSM.indb 27 16/08/02 14:02:52
To Next Page
Loading...
