Desynchronization Diagnosis For Compressor H7 - Toyotomi KURO Mini Service Manual

7.Desynchronization diagnosis for compressor
Main check point:
(1) system pressure (2) power supply voltage
NOTE:The control board as below means the control board of outdoor unit.
Desynchronization occurs
after turning on the unit
N
Check whether the compressor
has stopped operation for more
than 3mins.
Check whether
the compressor wire (UVW) is
connected well and the connection
sequence is the clockwise
direction.
N
Connect the wires
Replace the control board
Eliminate
Y
malfunction
Replace the compressor
End
Y
Y
N
Desynchronization occurs
during operation
Does the outdoor fan operate
normally?
Y
Is the radiation for the unit
not good?
N
Is the input voltage of the
unit normal?
Y
Is the refrigerant too much?
N
Replace the control board
Eliminate
malfunction
N
Replace the compressor
End
Check whether the fan
terminal OFAN is
N
connected well.
Improve the radiation of the
unit (such as clean the heat
Y
exchanger, strengthen the
ventilation, etc.) .
Turn on the unit when the
N
power has resumed to the
normal range.
Charge the refrigerant
Y
according the Service
Manual.
Y
Replace the fan
capacity C1.
Replace the outdoor fan
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