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brush the primary exchanger using a bristle
brush.
9.6 Check the pressure in the heat-
ing expansion tank
Empty the heating circuit as described in
section "Emptying the heating circuit" on
page 56 and check that the expansion
tank pressure is not less than 1 bar.
If the pressure is lower, correct the pres-
sure.
9.7 Cleaning the domestic hot wa-
ter exchanger
Descaling the domestic hot water exchang-
er will be assessed by a technician from an
Authorised Service Centre, who will perform
the cleaning using specific products.
9.8 Cleaning the burner
The ramp and multi-gas type burner does
not require any special maintenance, simply
dust it off using a bristle brush. More specif-
ic maintenance for this component will be
assessed and performed by a technician
from an authorised service centre.
9.9 Controlling the flue gas ex-
haust duct
Have a technician from an authorised ser-
vice centre periodically check the condition
of the flue gas exhaust duct, the air duct and
the efficiency of the flue gas safety circuit
(at least once a year).
To check the vacuum of the Venturi, use the
tapping points indicated in Figure 9.6.
MAINTENANCE
Figure 9.6
Refer to the following table for the minimum
pressure value for the Venturi:
M290E.24CM model
Minimum Venturi pressure
M290E.28CM model
Minimum Venturi pressure
M290E.32CM model
Minimum Venturi pressure
Figure 9.7
9.10 Checking boiler efficiency
Carry out performance checks at the inter-
vals anticipated by the regulations in force.
• Make sure that the room thermostat is in
the "heat request" position.
• Draw off an abundant amount of DHW by
opening the taps.
• Activate the "chimney sweep function" at
maximum output in DHW mode (see "Set-
ting the boiler's chimney sweep function"
on page 58)
• Check boiler combustion using the flue
gas outlet on the flue gas exhaust pipe
near the boiler and compare the data
measured with those below.
Pa
76
mbar
0.76
Pa
111
mbar
1.11
Pa
149
mbar
1.49
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