Cleaning and maintenance
Regular maintenance
13
Check that the ash box seal on the boiler is intact and
replace it if necessary.
Fig. 2-10: Seals
Attaching the ash box to the boiler
Remove the cover plate again and store it at the boiler.
Fig. 2-11: Cover plate
Re-attach the lid to the ash box. Push the ash box over
the connection on the boiler and connect it to the boiler
with the locking lever.
Fig. 2-12: Locking lever
2.4.3
Check pressure of the heating
system
Checking the heating system's water pressure
In buildings with up to three storeys, the optimum
water pressure in a cold heating system is between 1
and 2 bar. For a warm heating system, the optimum
water pressure is between 1.5 and 2.5 bar.
Fig. 2-13: Pressure gauge
The control system gives a warning on the screen
as soon as the boiler pressure is too low. If the
boiler pressure falls below 0.8 bar or rises above 2.8
bar, the control system automatically switches the
boiler off.
Adjust the pressure of the heating system on the filling
and draining connection of the boiler.
Fig. 2-14: Filling and draining connection
If the water pressure is too low, fill the cold
heating system to approx. 2 bar. Do not fill to a
higher pressure, because water expands as the
temperature rises and the water pressure also rises in
heating mode. The safety valve triggers at approx. 2.8
bar.
If the water pressure drops several times a year,
contact a heating professional. When refilling
water in the heating system, the same water as used
during initial filling should be used whenever possible
(e.g. treated water).
