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MAINTENANCE
MAINTENANCE
More specific maintenance will be valuated
and carried out by a competent Gas Safe
Registered Engineer
.
Attention, to reassemble repeat
the operations carried out in re-
verse order. Be careful not to
damage the OR gasket of the gas
pipe when inserting the pipe in Air
box.
After any service operation on
the components of the gas circuit
check all the connections for gas
leaks.
10.7 Check the pressure of the heat-
ing expansion vessel
Drain the heating circuit as described in sec
-
tion "Emptying the C.H. system" on page 71
and check that the expansion vessel pressure
is not less than 1 bar.
If the pressure is less, see to correct pressuri
-
sation.
10.8
Checking the flue system
Have the integrity of the flue
outlet and air in-
take pipe, checked periodically, at least once
a year. For all the above maintenance opera
-
tions it is advisable to call an approved Ser
-
vice Engineer.
10.9 Combustion analysis check
Carry out performance checks at the intervals
provided by the laws in force.
•
Connect a flue analyser to the flue analysis
outlets on the flue exhaust of the boiler Fig.
10.17.
Fig. 10.17
Flue analysis
points
•
Make sure that the ambient thermostat is in
the position “call for heat”.
•
Activate the “flue sweep function” at maxi
-
mum heating power (see "Setting the boiler
flue sweep function" on page 75).
•
Check the combustion of the boiler using the
outlets located on the flue tubes (Fig. 10.17)
and compare the data measured with that
following.
Fig. 10.18
Model Inovia 25S ERP
Nominal heat input
(A) (E)
kW
25,0
Nominal efficiency
%
97,4
Combustion efficiency
%
97,5
Air index
n
1,2
Flue gas CO
2
content
%
9,0 -9,8
Flue gas O
2
content
%
3,7
Flue gas CO
content
ppm
238
Flue gas temperature
°C
83,1
Values refer to tests with a an 80 mm double exhaust
split by 1 + 1 m and natural gas G20 and a supply /
return heating temperature of 60°/80°C.
The values in the tables are measured at the
nominal useful power with factory calibration.
