Installation manual
44 SAVIO PLUS COMBI MANUAL
17. Annual Maintenance Cont.
Checking the pressurization in the expansion vessel:17.8
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 of
this manual. If the pressure should be lower, take steps to correct the pressure level. To check
the pressure at the venturi device, use the test points (12 on page 11).
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 17.5
Venturi test
points
Visual inspection of appliance:17.9
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:17.10
Check appliance for gas soundness. Recheck operational pressures and adjust as necessary
as described in Section 15.4 page 37 of this manual.
Cleaning the primary heat exchanger:17.11
Take off the front panel of the case, then the sealed chamber lid and the front panel of the com-•
bustion 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 newspa-
per or similar). Brush out the primary heat exchanger (9 on page 10) with a bristle paintbrush.
Cleaning the domestic hot water exchanger:17.12
The descaling of the domestic hot water exchanger will be evaluated by the Authorised Assis-
tance Centre Technician, who will carry out any cleaning, using specifi c products.
Condensate trap:17.13
To clean the condensate trap:
Remove the front and right case panels.•
Disconnect the trap from the drain pipe.•
Using pliers, remove the spring D moving •
it upwards.
Disconnect the wirings from the trap.•
Reassemble carrying out the removal op-•
erations in reverse order.
The trap should be serviced once a year dur-
ing the annual service.
Figure 17.6