SAVIO HEAT ONLY MANUAL
37
17. Annual Maintenance Cont.
Emptying the Central Heating System:
17.4
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 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
Checking the pressurization in the expansion vessel:
17.5
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 25 of this manual. If the pressure should be lower, take steps to correct the pressure
level.
Cleaning the burner:
17.6
The sloping and multi-gas type burner (7 on page 10) does not need special maintenance, but
it is suf cient to dust it with a bristle paintbrush.
Checking the ue:
17.7
Have the integrity of the 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 ef ciency of the 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.
To check the pressure at the venturi device, use the test points (12 on page 10).
Remove the caps of the pressure test
•
points and connect a differential pressure
gauge.
Switch on the boiler.
•
Compare the value on the gauge with the
•
minimum values of venturi pressure indi-
cated in the Section 2 on page 9.
Figure 17.4
Air-Flue exhaust
sampling points
Visual inspection of appliance:
17.8
Visually inspect all water joints, seals and connections for any evidence of leakage and re-
tighten, grease or replace them as necessary.
Gas pressures and soundness:
17.9
Check appliance for gas soundness. Recheck operational pressures and adjust as necessary
as described in Section 15.4 page 31 of this manual.
Summary of Contents for Heat Only
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