Regular checks
If anything unusual occurs, messages about the malfunc-
tion appear in the display in the form of different alarm
texts.
SAFETY VALVE
The water heater’s safety valve sometimes releases a
little water after hot water usage. This is because the
cold water, which enters the water heater, expands
when heated causing the pressure to rise and the safety
valve to open. The climate system’s safety valve must
be completely closed and must not normally release any
water.
The functioning of the safety valve should be checked
regularly. You can find the safety valve behind the inspec-
tion panel on the front. Perform the checks as follows:
1.
Open the valve.
2.
Check that water flows through the valve.
3.
Close the valve.
4.
Check the system pressure, top up if required.
CHECK PRESSURE
VVM S320 has a pressure gauge, which shows the
heating system pressure. The pressure should be
between 0.5 and 1.5 bar, but varies during temperature
changes. If the pressure drops to 0 or rises to 2.5 bar
frequently, contact your installer for troubleshooting.
FILLING THE CLIMATE SYSTEM
If the pressure is too low in the climate system, it needs
to be topped up. See the Installer Manual for more in-
formation.
VENTING THE CLIMATE SYSTEM
In event of repeated filling of the climate system, or if
bubbling sounds are heard from the indoor module, the
system may need venting. This is done as follows:
1.
Turn off the power supply to the indoor module.
2.
Vent the indoor module via the vent valves and the
rest of the climate system via the relevant vent
valves.
3.
Keep topping up and venting until all air has been
removed and the pressure is correct.
The climate system may require topping up after vent-
ing.
13Chapter 5 | Maintenance of VVM S320NIBE VVM S320
5 Maintenance of VVM S320
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