Cleanig The Burner; Checking The Combustion Fan; Checking The Flue - Biasi Riva Plus Installation & Operation Instructions

17. Annual Maintenance Cont.
• Take off the front panel of the case, then the sealed chamber lid and the front panel of the
combustion chamber.
If you notice dirt on the fi ns of the primary heat exchanger (9 on page 10), cover the sloping
surfaces of the burner (7 on page 10) entirely in a protective layer (sheets of newspaper or
similar). Brush out the primary heat exchanger (9 on page 10) with a bristle paintbrush.
16.5 Checking the pressurization in the expansion vessel:
Empty the central heating system as described in section 17.3 of this chapter and check that
the pressure in the expansion vessel is not less than 1 bar (14.5 psi). See also section 13.2
page 30 of this manual. If the pressure should be lower, take steps to correct the pressure
level.
Follow the instructions for removing the ex-
ternal panels from 17.2. Remove the nine
screws labelled C in fi gure 17.4. Now you
will have complete access to the combustion
chamber. The sloping and multi-gas type
burner (7 on page 10) does not need special
maintenance, but it is suffi cient to dust it with
a bristle paintbrush.
The combustion fan does not require any special maintenance. Lubrication is not necessary
due to the fact that the ball bearings are sealed. Check that the fan operates and that the vis-
ible impeller fi ns are free of any dirt or obstructions.
Have the integrity of the fl ue outlet pipe (24 on page 10) air intake pipe (25 on page 10),
checked periodically, the venturi device (23 on page 10) cleaned and the effi ciency of the fl ue
safety circuit checked at least once a year. For all the above maintenance operations it is ad-
visable to call an approved Service Engineer.
• Remove the four Phillips head screws
from the vent connector on the boiler.
• Remove the vent connector from the boil-
er by pulling vertically on it.
• Remove the fi rst elbow from the horizon-
tal run of the exhaust to the outside.
42 RIVA PLUS MANUAL
16.4 Cleaning the primary heat exchanger:
16.6 Cleaning the burner:

16.7 Checking the combustion fan:

16.8 Checking the fl ue:
Figure 16.4
• Using a fl ashlight inspect each length of
vent pipe for obstructions and dirt buildup.
Clean any that is found with an appropri-
ate sized brush.
• Inspect the venture device inside the out-
let of the combustion fan. Make sure that
it is free of any dirt build up or blockage.