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• Connect a flue analyser to the flue gas
analysis outlets on the flue gas exhaust
on the boiler Figure 9.10.
Figure 9.10
• 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 66)
• Check the boiler combustion using the
outlets located on the flue pipes (Figure
9.10) and compare the data measured
with the following.
Model M270V.2025 SM
Nominal heat input in d.h.w. mode kW
Nominal efficiency in d.h.w. mode %
Combustion efficiency
Air index
Composition of CO2 fumes
Composition of O2 fumes
Composition of CO fumes
Flue gas temperature
Values refer to tests with 80 mm 1 + 1 m twin pipe
discharge and Methane gas G20 and with heating
delivery/return temperature of 60°/80°C
Figure 9.11
MAINTENANCE
Flue gas anal-
ysis outlets
26,0
96,7
%
98,2
n
1,3
%
9,0 - 9,6
%
3,9
ppm
225
°C
69
Model M270V.2530 SM
Nominal heat input in d.h.w. mode kW
Nominal efficiency in d.h.w. mode %
Combustion efficiency
Air index
Composition of CO2 fumes
Composition of O2 fumes
Composition of CO fumes
Flue gas temperature
Values refer to tests with 80 mm 1 + 1 m twin pipe
discharge and Methane gas G20 and with heating
delivery/return temperature of 60°/80°C
Figure 9.12
9.10 Checking the condensate dis-
charge siphon
The condensate discharge siphon 33 (Fig-
ure 9.13) does not require particular main-
tenance. Simply check:
• that solid deposits have not formed and
remove them if necessary;
• that the condensate outlet pipes are not
obstructed.
To clean the inside of the siphon, simply re-
move it and turn it upside down so that any
impurities can be extracted.
31,0
97,1
%
98,3
n
1,3
%
9,0 - 9,6
%
3,9
ppm
196
°C
73
- 65 -
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