Danfoss DHP-A Service Instructions Manual page 48

Cause
4. There is no overflow pipe connec-
ted to the safety valve(s).
5. Filler valve between incoming cold
water and heating system not closed
or leaking.
6. No condensation drain to heat
pump's drip tray.
7. Lack of condensation insulation on
cold water pipe and/or brine pipe.
8. Leak at soldered joints.
9. Leak at the condenser's drain cock.
10. Leak at the condenser's bleed
valve.
11. Leak at soldered joint on water
heater.
12. Associated leak on the water
heater.
13. Associated leakage in the con-
denser.
14. Anti-freeze is forced out of the
safety valve on the expansion tank
(brine system).
46 – Service instructions VMGFC302
Troubleshooting
Establish which safety valve does not have
an overflow pipe.
Check whether water continuously leaks
from the safety valve on the expansion ves-
sel on the hot side.
Check that condensation drain is installed
and correctly connected.
Establish where the condensation is com-
ing from.
Locate the leak.
1. Check that the valve is completely
closed.
2. Check that the sealed cover is
sealed.
Check that it is completely closed.
Locate the leak.
•
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 cold
side.
•
Check for lack of refrigerant in the unit.
•
Check by smelling at the 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 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.
Remedy
Install an overflow pipe according to the
applicable norms.
Try closing the filler valve and see if
water stops dripping from the safety
valve. If not, replace the filler valve.
Install the condensation drain that runs
out into the floor drain.
The brine pipe must always be insulated.
In the event of problems with condensa-
tion on the cold water pipes, insulate
them. Condensation often accumulates
in joints and angled sections of the insu-
lation.
Improve the insulation.
Drain the system of fluid, repair the leak.
If the leak is on the connection pipe to
the heat exchanger, also drain the refrig-
erant side.
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
it.
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 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 retract-
ing inwards, a vacuum valve can be
installed in the system.