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the components of the gas cir-
cuit check all the connections
for gas leaks.
9.7
Check the pressure of the
heating expansion vessel
Drain the heating circuit as described in
section "Emptying the c.h. system" to page
76 and check that the expansion vessel
pressure is not less than 1 bar.
If the pressure is less, see to correct pres-
surisation.
9.8
Cleaning the domestic hot
water exchanger
Descaling the domestic hot water exchang-
er will be valued by an approved Service
Engineer, who will carry out any cleaning
using specific products.
9.9
Checking the flue expulsion
pipe
Have the integrity of the flue outlet pipe air
intake pipe, checked periodically, at least
once a year. For all the above maintenance
operations it is advisable to call an approved
Service Engineer.
9.10 Combustion analysis check
It is recommended that a combustion analy-
sis check is made. Remove the plug as indi-
cated in Fig. 9.12 and carry out combustion
analysis check and adjustment if necessary
as described in the section Gas valve - Ad-
justment of the Service manual.
- 78 -
MAINTENANCE
Fig. 9.12
• Activate the "chimney sweep function" at
maximum heating power (vedere "Setting
the boiler chimney sweep function" a pag.
80).
• 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.
9.12) and compare the data measured
with that following.
Model Advance Plus 25C
Nominal heat input
Nominal efficency
Combustion efficency
Air index
Flue gas CO
Flue gas O
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. 9.13
Flue analy-
sis points
(A) (E)
content
2
content
2
kW
20,0
%
97,4
%
97,6
n
1,23
%
9,2 - 9,8
%
3,9
ppm
120
°C
76,0
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