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9.8
Check the pressure of the heat-
ing expansion vessel
Drain the heating circuit as described in sec-
tion "Emptying the c.h. system" to page 83
and check that the expansion vessel pressure
is not less than 1 bar.
If the pressure is less, see to correct pressuri-
sation.
9.9
Cleaning the domestic hot wa-
ter exchanger
Descaling the domestic hot water exchanger
will be valued by an approved Sevice Engi-
neer, who will carry out any cleaning using
specific products.
9.10 Checking the flue expulsion
pipe
Have the integrity of the flue outlet pipe 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.
9.11 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.
9.16.
Fig. 9.16
MAINTENANCE
Flue analysis
points
• Activate the "chimney sweep function" at
maximum heating power (see "Setting the
boiler chimney sweep function" to page
86).
• Make sure that the ambient thermostat is in
the position "call for heat".
• Withdraw an abundant amount of d.h.w. by
opening the faucets.
• Check the combustion of the boiler using the
outlets located on the flue tubes (Fig. 9.16)
and compare the data measured with that
following.
Model Inovia 25C ERP
Nominal heat input
(A) (E)
Nominal efficency
Combustion efficency
Air index
Flue gas CO
content
2
Flue gas O
content
2
Flue gas CO content
Flue gas temperature
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.
Fig. 9.17
Model Inovia 30C ERP
Nominal heat input
(A) (E)
Nominal efficency
Combustion efficency
Air index
Flue gas CO
content
2
Flue gas O
content
2
Flue gas CO content
Flue gas temperature
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.
Fig. 9.18
kW
20,0
%
97,4
%
97,6
n
1,2
%
9,2 - 9,8
%
3,9
ppm
139
°C
76,0
kW
25,0
%
97,4
%
98,2
n
1,2
%
9,2 - 9,8
%
3,9
ppm
75
°C
74,0
- 85 -
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