Danfoss DHP-A Service Instructions Manual page 17

Service instructions
2.4.2 Leakage
Problem – Leak fluid side
Cause
1. Insufficiently tightened connec-
tions.
2. Cracked nut or connection.
3. Defective gasket or O-ring.
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).
Danfoss Heating Solutions
Domestic heat pumps
Troubleshooting
Locate the leak.
Locate the leak.
Locate the leak.
Establish which safety valve does not have an over-
flow pipe.
Check whether water continuously leaks from the
safety valve on the expansion vessel on the hot
side.
Check that condensation drain is installed and cor-
rectly connected.
Establish where the condensation is coming 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 reduc-
tion 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 vac-
uum created.
Remedy
▪ Tighten the connection and check that
it is sealed.
▪ If it is still not sealed, replace the entire
connection and support sleeve (only
at soft pipes).
Replace nut or connection.
Replace the gasket or O-ring.
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 condensation
on the cold water pipes, insulate them.
Condensation often accumulates in joints
and angled sections of the insulation. Im-
prove 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 refrigerant
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, re-
place 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 ex-
change 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.
VIGFI102
17