Check The Pressure Of The Heating Expansion Vessel; Checking The Flue Expulsion Pipe; Combustion Analysis Check - Biasi Advance Plus 16S User Manual And Installation Instructions

the components of the gas cir-
cuit check all the connections
for gas leaks.
9.6 Check the pressure of the
heating expansion vessel
Drain the heating circuit as described in
section "Emptying the c.h. system" to page
71 and check that the expansion vessel
pressure is not less than 1 bar.
If the pressure is less, see to correct pres-
surisation.
9.7 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.
9.8

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.
Fig. 9.12
- 74 -
MAINTENANCE
Flue analysis
points
• Activate the "chimney sweep function" at
maximum heating power (see "Setting the
boiler chimney sweep function" to page
76).
• 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 16S
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. 9.13
Model Advance Plus 25S
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. 9.14
kW 16,0
% 97,7
% 97,8
n 1,2
% 9,2-9,8
% 3,9
ppm 84
°C 72,0
kW 25,0
% 97,4
% 97,5
n 1,23
% 9,0 -9,8
% 3,7
ppm 240
°C 83,1