Samsung AM080 XV Series Service Manual page 269

Test Operation
5) Service Valve
Inspection item : Outdoor Unit Service Valve is open / closed
Error code: E503 (The resulting report "Undetermined")
Determine the status of the Service Valve open / closed of the each Outdoor Unit.
If the judgment of Outdoor Unit Service Valve is "Undetermined" : Checking in accordance with the following order.
Is Service Valve open state?
Main EEV, Pressure sensor normal?
Is refrigerant in the system properly?
[Caution]
- If the judgment of Service Valve "Undetermined" : Display the error to corresponding Outdoor Unit and then Auto Trial Operation is exited. (Stop
the overall system)
- If inspect service valve : Check the Liquid pipe and Gas pipe, Service Valve.
- If the frost formation of Outdoor Heat exchanger, continue Trial Operation until defrost operation begins.
And then complete after add more than 1 hour operation after end of defrost operation.
(Execute checking of 4Way Valve and Main EEV together.)
- 4Way Valve abnormal symptoms
1) Strange noise of compressor to operate.
2) Indoor unit EVA In/Out maintain the temperature below zero (Less than -0°C )
3) 4Way Valve : Refer to the Service Manual.
- Main EEV abnormal symptoms
1) When closed Main EEV opening : Compressor suction degree of overheat impossible to ensure and less than DSH 20K.
2) When opened Main EEV opening : Compressor suction degree of overheat is high status.
3) Main EEV : Refer to the Service Manual.
- Pressure sensor abnormal symptoms : Refer to the Service Manual.
9-8
Yes
Is 4Way Valve,
Yes
Yes
Complete
No
Service Valve opening
No
Check the 4Way Valve,
Main EEV, Pressure sensor.
No
Adjusts the refrigerant
(Addition / Emitted)
Samsung Electronics