Danfoss DHP-AX Installation And Service Instructions Manual page 53

Cause
4. Overheating too high.
5. Lack of refrigerant, not enough
refrigerant in the system.
15.4.2 Leakage
Problem – Leak fluid side
Cause
1. Insufficiently tightened con-
nections.
2. Cracked nut or connection.
3. Defective gasket or O-ring.
4. There is no overflow pipe con-
nected 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 insula-
tion 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.
Troubleshooting
Using manometer apparatus and ther-
mometer check what the overheating
reading of the unit is.
Also check that bulb and capillary tube
are undamaged and that the bulb is cor-
rectly installed.
Using manometer apparatus and ther-
mometer, check that the unit's overhea-
ting is correct for the specific refrigerant.
Troubleshooting
Locate the leak.
Locate the leak.
Locate the leak.
Establish which safety valve does not
have an overflow pipe.
Check whether water continuously leaks
from the safety valve on the expansion
vessel on the hot side.
Check that condensation drain is instal-
led and correctly 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.
VMBMH302
Remedy
If the overheating reading does not cor-
respond with the instructions for the
specific refrigerant, adjust the expansion
valve until the correct value is obtained.
See separate instructions for cooling
techniques.
If overheating cannot be adjusted with
the expansion valve or if the capillary
tube/bulb is damaged, replace it.
Follow the correct procedure (depending
on type of refrigerant) to add the correct
amount of refrigerant.
If there appears to be a leak in the refri-
gerant circuit, carry out leak tracing and
any necessary corrective action. If leak
tracer is not available, brush soap water
on the suspected leak and look for bubb-
les. Also check for oil as this can come
out from the refrigerant circuit.
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 conden-
sation 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 refri-
gerant 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.
Service – 53