Emptying The D.h.w. Circuit; Emptying The Central Heating Circuit; Cleaning The Primary Exchanger; Checking The Pressure Of The Expansion Tank - Biasi RinNOVA 24S User Manual And Installation Instructions

the boiler in an optimal manner.
Figure 9.3

9.3 Emptying the d.h.w. circuit

• Close the installed inlet cocks.
• Open the system's domestic hot water cocks.
9.4 Emptying the central heating
circuit
• Close the central heating system delivery
and return cocks.
• Loosen the boiler drain cock 23 indicated in
Figure 9.4.
Figure 9.4
- 60 -
MAINTENANCE
C
Closed
23
Open

9.5 cleaning the primary exchanger

Remove the front body panel and the front
combustion chamber panel.
If there is dirt on the primary exchanger fins,
fully cover the surface of the burner ramps (us-
ing a piece of newspaper or similar) and brush
the primary exchanger them using a bristle
brush.
9.6 checking the pressure of the
expansion tank
Empty the heating circuit as described in sec-
tion "Emptying the central heating circuit" on
page 60 and check that the expansion tank
pressure is not less than 1 bar.
If the pressure is lower, correct the pressure.
9.7 cleaning the domestic hot water
exchanger
Descaling the domestic hot water exchanger
will be assessed by a technician from an Au-
thorised Service Centre, who will perform the
cleaning using specific products.

9.8 cleaning the burner

The ramp and multigas type burner does not
require particular maintenance, simply dust it
off using a bristle brush. Most specific mainte-
nance for this component will be assessed and
performed by a technician from an Authorised
Service Centre.
9.9 controlling the flue gas expulsion
duct
Have a technician from an Authorised Service
Centre periodically check (at least once a year)
the condition of the flue gas expulsion duct,
the air duct and the efficiency of the flue gas