Danfoss DHP-AX Installation And Service Instructions Manual page 54

Cause
11. Leak at soldered joint on
water heater.
12. Associated leak on the water
heater.
13. Associated leakage in the
condenser.
14. Anti-freeze is forced out of
the safety valve on the expan-
sion tank (brine system).
15.4.3 Noise
Problem – Noise problem in the radiator system
Cause
1. Flexible hoses missing.
2. Incorrectly installed flexible
hoses.
3. Installing/suspending pipes.
4. Clicking.
5. Circulation noise (whistling
noise in the heating system).
54 – Service
Troubleshooting
Locate the leak.
• Establish whether water continuously
leaks from the safety valve on the expan-
sion vessel on the hot side.
• Establish whether water continuously
leaks from the safety valve on the cold
side.
• Check for lack of refrigerant in the unit.
• Check by smelling by safety valve on
the hot side, open the valve and check.
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 ori-
ginal 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.
Troubleshooting
Flexible hoses must be installed accor-
ding to the instructions.
Flexible hoses must be installed accor-
ding 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 com-
pleted hot water 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.
VMBMH302
Remedy
If there is a leak at the soldered joint,
replace the water heater.
If the water heater has a leak, replace it.
If the condenser has a leak, replace it.
To prevent anti-freeze from being for-
ced 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.
Remedy
Install flexible hoses according to the
instructions.
Install flexible hoses according to the
instructions.
If something seems to be incorrect accor-
ding 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
adjusted, make adjustments.
Can the heating system be run at a lower
flow?