Air-to-water Heat Pump
66
MONOBLOC
TYPE
(4) Abnormal Noise of PFC Inductor
Generally, the continuous and minute sound of inductor is normal. Abnormal noise of PFC inductor refers to
discontinuous and obvious noise. The reasons may be:
•
PFC malfunction
•
abnormal output of driving board
No
No
No
Yes
Yes
Yes
Yes
1. If it is affected by damp, find out the
reason and take some precautionary
measures. After drying the mainboard,
brush it with damp-proof gum water.
2. If it is polluted, find out the reason
and protect it from dust. If the
environment is bad, clean the dirt
periodically.
3. If it is short-circuited, find out the
reason and clean the electric box so
as to prevent the conductive matter such
as iron chipings adhering on the board.
Is it wet, dirty or
short-circuited?
Is there
abnormal noise
upon startup of the
compressor?
Abnormal
noise of PFC
inductor
Inspect the mainboard
1 minute after power off
or the bus voltage is
below 36V.
Dry and clean it
or remove the
short circuit.
Restart the unit.
Does it work
normally？
Inspect the
operation of the
compressor.
Is there abnormal
vibration or noise
for the compressor?
The driving board is
damaged. Please
replace the mainboard.
The PFC is
damaged. Please
replace the mainboard.
It is recorded.
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