Noise Problems - Danfoss DHP-H Installation And Service Instructions Manual

Cause
Leak at the drain tap at
the condenser.
Leak at the bleed valve at
the condenser.
Associated leakage on
the water heater
Associated leakage in
the heat exchanger (con-
denser).
Filler valve between
incoming cold water
and heating system not
closed.
15 .8 Noise problems
Shrieking whistling noise
Cause
Expansion valve
Non-return valve com-
pressor IPR-valve
Loud compressor noise
Cause
Phase drop
Touching pipes – vibra-
tions
Compressor fault
The compressor is incor-
rectly installed.
Noise in the heating system
Cause
Circulation noise (hissing)
Tensioned flexible hoses
4
Troubleshooting
1. Check that the valve is completely closed.
2. Check that the sealed cover is sealed.
Check that it is completely closed.
Establish whether water continuously leaks from the safety valve
on the expansion vessel on the hot side.
Establish whether water continuously leaks from the safety valve
on the expansion vessel on the hot side.
Troubleshooting
Troubleshooting
Check that there is 400 V between incoming phases on the
heat pump.
If there is supply to the heat pump, measure all electrical com-
ponents all the way to the compressor.
Establish which pipe(s) is/are causing the problem.
Check whether the support sleeve engages the bottom plate.
Troubleshooting
Flexible hoses must be installed according to the instructions.
If there is correct voltage all the
way between phases, replace
the compressor.
Try to release any tensions that
cause the vibrations.
Replace the compressor.
Replace the support sleeve.
Check the radiator system. Open
any valves or choke valves that
are causing circulation noises.
Try running the heat pump with
a greater delta by reducing the
circulation pump's speed and
therefore the system's flow.
Install flexible hoses according
to the instructions.
VMBMA102
Remedy
If the sealed cover is not sealed,
replace the sealed cover or the
entire drain tap.
If it is fully closed and still leaks,
replace the bleed screw.
Replace the hot water heater
Replace the exchanger
Close the valve.
Remedy
Take overheating readings,
adjust to the recommended
value.
Try opening and closing the
valve fully.
Adjust the expansion valve to
recommended overheating
value again.
If the problem persists, replace
the expansion valve.
The IPR valve opens dur-
ing pressure increases in the
compressor. If it remains in
the open position, replace the
compressor.
Remedy
Remedy