Maintenance of VVM 225
REGULAR CHECKS
Your electric boiler/indoor module is, in principle, maintenance free and
therefore requires the minimal care after commissioning. However, it is
recommended that you check your installation regularly.
If anything abnormal occurs, messages about the malfunction appear in
the display in the form of various alarm texts. See alarm management
in section "
Safety valve
VVM 225 has two safety valves, one for the hot water heater and one
for the climate system.
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 function of the safety valve should be checked regularly. You can
find the safety valve on the incoming pipe (cold water). Perform 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 225 has a pressure gauge, which shows the heating system pres-
sure. 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 fre-
quently, 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 information.
21
Chapter 2 | The heating installation – the heart of the house
NIBE VVM 225
