Installation guide

48
VMBME102
Cause Troubleshooting Remedy
5. Lack of refrigerant, not enough refriger-
ant in the system.
Using manometer apparatus and thermom-
eter, check that the unit’s overheating is
correct for the specific refrigerant.
Then check in the same way that the unit’s
cooling is correct. See separate instructions
for cooling techniques.
If cooling is not at the correct level com-
pared with the specific refrigerant and is
too low, there is insufficient refrigerant
in the unit. 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 refriger-
ant 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 bubbles. Also
check for oil as this can come out from the
refrigerant circuit.
14.4 Operational problem – Leakage
Problem – Leak fluid side
Cause Troubleshooting Remedy
1. Insufficiently tightened connections. Locate the leak. • 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)
2. Cracked nut or connection. Locate the leak. Replace nut or connection.
3. Defective gasket or O-ring. Locate the leak. Replace the gasket or O-ring.
4. There is no overflow pipe connected to
the safety valve(s).
Establish which safety valve does not have
an overflow pipe.
Install an overflow pipe according to the
applicable norms.
5. Filler valve between incoming cold water
and heating system not closed or leaking.
Check whether water continuously leaks
from the safety valve on the expansion ves-
sel on the hot side.
Try closing the filler valve and see if water
stops dripping from the safety valve, if not,
replace the filler valve.
6. No condensation drain to heat pump’s
drip tray.
Check that condensation drain is installed
and correctly connected.
Install the condensation drain that runs out
into the floor drain.
7. Lack of condensation insulation on cold
water pipe and/or brine pipe.
Establish where the condensation is coming
from.
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 insulation.
Improve the insulation.
8. Leak at soldered joints. Locate the leak. 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.
9. Leak at the condenser’s drain cock. 1. Check that the valve is completely closed.
2. Check that the sealed cover is sealed.
If the sealed cover is not sealed, replace the
sealed cover or the entire drain tap.
10. Leak at the condenser’s bleed valve. Check that it is completely closed. If it is fully closed and still leaks, replace it.
11. Leak at soldered joint on water heater. Locate the leak. If there is a leak at the soldered joint,
replace the water heater.
12. Associated leak on the water heater. • 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.
If the water heater has a leak, replace it.
13. Associated leakage in the condenser. • Check for lack of refrigerant in the unit.
• Check by smelling by safety valve on the
hot side, open the valve and check.
If the condenser has a leak, replace it.