Danfoss DHP-A Service Instructions Manual page 18

Service instructions
2.4.3 Noise
Problem – Noise problem in the radiator system
Cause
1. Flexible hoses missing.
2. Incorrectly installed flexible ho-
ses.
3. Installing/suspending pipes.
4. Clicking.
5. Circulation noise (whistling noise
in the heating system).
Problem – Loud compressor noise
Cause
1. Phase drop.
The compressor attempts to start or
operates on two phases (only ap-
plies to 3 phase heat pumps) .
2. Touching pipes – vibrations.
3. Compressor fault.
18
Domestic heat pumps
Troubleshooting
Flexible hoses must be installed according to the
instructions.
Flexible hoses must be installed according to the
instructions.
Check if the mountings are too rigid, right type,
right sizes and/or installed too close together.
▪ Establish when clicking occurs, during heating
and/or in connection with completed hot wa-
ter production?
▪ Locate the clicking noises.
Check the heating system.
▪ Closed valves, choke valves, adjuster valves or
other restrictions in the radiator system can
cause circulation noise.
▪ Is the heating system correctly adjusted for
flow?
▪ Too great a flow in the heating system can
cause circulation noise.
Troubleshooting
1. Check that there is 400 V between incoming
phases on the heat pump.
2. If there is supply to the heat pump, measure
the voltage for all electrical components all
the way to the compressor, see wiring dia-
gram.
Establish which pipe(s) is/are causing the problem. Try to release any tensions that cause the
Determine whether the compressor is unusually
loud.
VIGFI102
Remedy
Install flexible hoses according to the in-
structions.
Install flexible hoses according to the in-
structions.
If something seems to be incorrect accord-
ing to the troubleshooting window, carry
out corrective actions.
A surge tank can be installed on the supply
line to mix the hot water with the existing,
slightly cooler, water, before it goes out to
the radiators.
Try lubricating lead-ins in walls, ceilings
and floors with silicone spray.
If the incorrect type of valve is used to
choke the flow, replace with the correct
type.
If the heating system is not correctly adjus-
ted, make adjustments.
Can the heating system be run at a lower
flow?
Remedy
Check where the phase drop is and rectify.
vibrations.
If the compressor is defective, replace it.
Danfoss Heating Solutions