Samsung AC052MN4DKH Service Manual page 76

1. Test items
1) Check the power connection. / Check the restart after power reset.
Is there a fault in input power? (Single-phase : 220Vac, 3-phase : 380Vac)
Does error occur again at operation after power is reset?
2) Check the connection of the power, and check whether the jointed power connection exists.
After having installed several units, please check that communication wires are not interchanged with piping.
3) Check the reactor and its connecting wires.
4) Check the fuses of EMI PBA.
5) Check the Terminal Block and Power Terminal Box and the wire assembly.
2. Check procedure
Is the power wire correctly connected?
Check the reactor and
its connecting wires.
1. Is the wire between the reactor and
the Inverter PCB of the outdoor unit correctly connected?
2. Is there any fault such as scratch,
pressing, broken or
loosened terminal?
Is EMI PCB fuse defective?
Check the Terminal Block
and Power Terminal Box.
1. Is the screw of the terminal block firmly Fastened?
2. Are the power wire of the Power Terminal Box and
terminal firmly assembled?
After replacing the Inverter PCB of the outdoor
unit, check for normal startup.
Samsung Electronics
Power OFF
Yes
Yes
Yes
No
End the service.
No
Reconnect the power wire.
1. Check the connecting wires. (between the
No reactor wire and the Inverter PCB wire of
the outdoor unit)
operation.
2. Replace the reactor.
operation.
Yes
1. Fasten the screws between Terminal Block
and power wire.
Yes
operation.
2. Connect the terminal of the Power Terminal
Box and the power wire.
normal operation.
Troubleshooting
Check the normal
End the service
Check the normal
End the service.
Replace the fuse.
Check the normal
End the service.
Check the
End the service.
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