Installation guide

49
VMBME102
Cause Troubleshooting Remedy
14. Anti-freeze is forced out of the safety
valve on the expansion tank (brine system).
During the winter, water surrounding the
hoses in the borehole can freeze. In some
cases, the ice can push against the hoses
slightly. Due to the reduction in volume in
the hose, the anti-freeze fills the expansion
tank and eventually forces some fluid out of
the safety valve.
When the ice in the borehole melts and the
hose expands and returns to its original
state, a vacuum is generated which results
in a reduction in tank level. As the safety
valve does not let any air in, the expansion
tank can retract inwards due to the vacuum
created.
To prevent anti-freeze from being forced
out from the safety valve, you can exchange
the existing expansion tank for a closed
pressure expansion vessel with a greater
volume.
To prevent the expansion tank retracting
inwards, a vacuum valve can be installed in
the system.
14.5 Operational problem – Noise
Problem – Noise problem in the radiator system
Cause Troubleshooting Remedy
1. Flexible hoses missing. Flexible hoses must be installed according
to the instructions.
Install flexible hoses according to the
instructions.
2. Incorrectly installed flexible hoses. Flexible hoses must be installed according
to the instructions.
Install flexible hoses according to the
instructions.
3. Installing/suspending pipes. Check if the mountings are too rigid, right
type, right sizes and/or installed too close
together.
If something seems to be incorrect accord-
ing to the troubleshooting window, carry
out corrective actions.
4. Clicking. • Establish when clicking occurs, during
heating and/or in connection with com-
pleted hot water production?
• Locate the clicking noises.
A surge tank can be installed on the supply
pipe 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.
5. Circulation noise (whistling noise in the
heating system).
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.
If the incorrect type of valve is used to
choke the flow, replace with the correct
type.
If the heating system is not correctly adjust-
ed, make adjustments.
Can the heating system be run at a lower
flow?
Problem – Loud compressor noise
Cause Troubleshooting Remedy
1. Phase drop.
The compressor attempts to start or oper-
ates on two phases.
1. Check that there is 400 V between incom-
ing phases on the heat pump.
2. If there is supply to the heat pump, meas-
ure the voltage for all electrical components
all the way to the compressor, see wiring
diagram.
Check where the phase drop is and rectify.
2. Touching pipes – vibrations. Establish which pipe(s) is/are causing the
problem.
Try to release any tensions that cause the
vibrations.
3. Compressor fault. Determine whether the compressor is unu-
sually loud.
If the compressor is defective, replace it.