RIVA COMBI MANUAL - REV B
45
17.5 Cleaning the primary heat exchanger:
• 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 fins of the primary heat exchanger (11 on page 11), cover the sloping
surfaces of the burner (9 on page 11) entirely in a protective layer (sheets of newspaper or
similar). Brush out the primary heat exchanger (11 on page 11) with a bristle paintbrush.
17.6 Checking the pressurization in the expansion vessel:
Empty the central heating system as described in section 17.4 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 26
of this manual. If the pressure should be lower, take steps to correct the pressure level.
17.7 Checking the pressurization in the d.h.w. expansion vessel:
Empty the d.h.w. circuit as described in section 17.3 of this chapter and check that the pressure
in the d.h.w. expansion vessel is not less than 3,5 bar (50 psi). See also section 13.2 page 26 of
this manual. If the pressure should be lower, take steps to correct the pressure level.
17.8 Checking the magnesium anode:
To guarantee protection of the storage tank from corrosion, it is advisable to check periodically
the magnesium anode (31 on page 12) by an Approved Service Person.
Note: Empty the storage tank as shown on 17.3 before checking the magnesium anode
17.9 Cleaning the burner:
The sloping and multi-gas type burner (9 on page 11) does not need special maintenance, but it
is sufficient to dust it with a bristle paintbrush.
17.10 Checking the combustion fan:
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 visible
impeller fins are free of any dirt or obstructions.
17.11 Checking the flue:
Have the integrity of the flue outlet pipe (33 on page 12) air intake pipe (34 on page 12),
checked periodically, the venturi device (29 on page 12) cleaned and the efficiency of the flue
safety circuit checked at least once a year. For all the above maintenance operations it is
advisable to call an approved Service Engineer.
17. Annual Maintenance Cont.
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