eta HACK 20 kW, Service Manual

Page: 11 / 64

Cleaning and maintenance Regularly
11
Inspect the seal on the ash box lid to ensure it is in
good order, and replace it if necessary.
Fig. 2-3: Seal
Inspect the integrity of the ash box seals on the boiler,
replace them if necessary.
Fig. 2-4: Seal
Attaching the ash box to the boiler
Reattach the cover of the ash box and secure with the
fasteners. Push the ash box over the connection on
the boiler and attach it to the boiler with the fasteners.
2.4.3 Check pressure of the heating
system
Check heating system 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. 2-5: Pressure gauge
If the water pressure is too low, fill the cold
heating system to approx. 2 bar. Do not fill to a
higher pressure, as water expands with increasing
temperature and the water pressure also rises when
the boiler is 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. prepared water).
2.4.4 Establish operational readiness
Switching on the boiler
Switch the boiler back on with the On/Off
switch.