Sinclair ASC-18A, Service Manual

Page: 125 / 264

DC INVERTER U-MATCH AIR CONDITION MAINTENANCE
119
Abnormal noise from PFC inductor
◆
Abnormal noise
from PFC
inductor
Abnormal
noise is heard
when the
compressor is
started
Dry the PFC board
and clear off the dirt
or eliminate the
short-circuit point.
Reinstall and start the
machine for testing.
Work normally?
Cut off the power
for 1 minute or
reduce the busbar
voltage to 36V or
lower. Then, check
the PFC board.
If it is moistened,
dirty or short
circuited?
Check the
operating
conditions of
compressor
1. If it is moistened, find out the cause and take
proper measures to prevent moisture. Dry the
PFV board and apply moisture-proof glue.
2. If it is dirty, find out the cause and take
dustproof measures. If the air quality of service
environment is poor, it is also required to clear
off the dirt periodically.
3. If it is short circuit, find out the cause and
clean the electric box to prevent the iron scraps
or other conductive substances from attaching
on the board.
Does the
compressor
vibrate heavily or
give out
abnormal noise?
Driver board is
damaged. Please
replace the driver
board.
PFC board is damaged.
Please replace the PFC
board.
Record and feed back
No
Yes
Yes
Yes
Yes
No
No