Combustion Analysis Check; Cleaning The Primary Heat Exchanger; Checking The Pressurisation In The Expansion; Vessel - Biasi Riva Plus HE M296.24SM User Manual And Installation Instructions

If the boiler is being drained to prevent
freezing, the d.h.w. heat exchanger must
be removed and inverted to drain fully or
an antifreeze solution added.
9.5

Combustion analysis check

If it is necessary to carry out a combustion
analysis remove the plugs indicated in Fig.
9.1.
Reference figures are given in the sections
"Technical Data" on pag. 24 or pag. 27 (Flue
gas figures).
9.6 Cleaning the primary heat
exchanger
• Take off the front of the case.
• Take off the removable front of the sealed
chamber and the front panel of the com-
bustion chamber.
If you notice dirt on the fins of the primary
heat exchanger (44on page 23):
• Cover the sloping surfaces of the burner
(41on page 23) entirely in a protective
layer (sheets of newspaper or similar).
• Brush out the primary heat exchanger
(44on page 23) with a bristle paintbrush.
9.7 Checking the pressurisation
in the expansion vessel
Empty the central heating systemas de-
scribed in section "Emptying the c.h. sys-
tem" to page 53 and check that the expan-
sion vessel pressure is not less than 1 bar.
See also section "Expansion vessel" to
page 30.
If the pressure is lower, take steps to correct
the pressure level
- 54 -
MAINTENANCE
9.8
The sloping and multi-gas type burner
(41on page 23) does not need special main-
tenance, but it is sufficient to dust it with a
bristle paintbrush.
To reach the burner:
• Take off the front of the case.
• Take off the removable front of the sealed
chamber and the front panel of the com-
bustion chamber.
• Brush out the burner with a bristle paint-
brush.
9.9
Have the integrity of the flue outlet pipe
(50on page 23) air intake pipe (51on page
23), checked periodically, the air pressure
sensor* (19on page 22) and the efficiency
of the flue safety circuit checked at least
once a year.
* For details see the section Fan and air
pressure sensor in the service manual.
For all the above maintenance operations
it is advisable to call an approved Service
Engineer.

9.10 Drain pipe inspection

Check the soundness and integrity of the
condensate drain pipe.
Verify the cleaness and correct filling of the
condensate traps.

9.11 Visual inspection of appliance

Visually inspect all water joints, seals and
connections for any evidence of leakage
and retighten, grease or replace them as
necessary.

Cleaning the burner

Checking the flue