Gree Dettson LOMO 19 Installation Manual page 78

Service Manual
5. Desynchronization diagnosis for compressor H7
(AP1 hereinafter refers to the control board of the outdoor unit)
Main detection points:
(1) system pressure (2) power supply voltage
Malfunction diagnosis process:
Synchronism after
energize the unit
N
If the stop time of
compressor is more
connected, the connection
sequenceforwards to clockwise
N
Connect
wire well
Y
Installation and Maintenance
and start it
than 3min
Y
If the compressor wire
COMP(UVW) is well
direction?
Y
Replace
control board
AP1
Remove
malfunction?
Replace
compressor
End
Synchronism
occurred during
operation
If the outdoor fan
N
works normally?
Y
If the radiating of unit
Y
is well?
N
If the input voltage of
N
unit is normal?
Y
Charge the refrigerant
If the refrigerant is
Y
too much?
Replace
control board
AP1
Remove
malfunction?
N
Replace
compressor
End
Check if the fan
Replace fan
terminal OFAN is
capacitor C1
connected well
Replace
Improve the radiating
of unit (clean heat outdoor fan
exchanger and
increase ventilation)
Start to run until the
power resume normal
voltage
with service manual
75