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3.2.10 Testing boiler efficiency
3.2.10.1 “Chimney sweep” func-
tion
The boiler has “chimney sweep”
function, to test boiler efficiency
and in order to adjust burner per-
formance.
Set knob 9 (pic. 1) to WINTER, and
room thermostat (if available) to ON.
While the boiler is operating, press
SPA button (“A” in pic. 18), the
boiler will turn off and then resu-
me ignition sequence starting again
to max. power. Max. boiler power
output is as much as MAX R (B in
pic. 18) set point
“Chimney sweep” function keeps
running for 15 minutes. In order to
deactivate “chimney sweep” func-
tion, turn selector 9 to any position
other than WINTER.
3.2.10.2 Checking combustion
performance
Coaxial duct system
In order to verify combustion perfor-
mance the following measurements
must be implemented:
- measure air intake through hole 2
(see pic. 19 section A).
- measure flue gas temperature and
CO
2
through hole 1 (see pic. 19
section A).
Allow boiler to reach working tem-
perature before performing any
measurement.
Split duct system
In order to verify combustion perfor-
mance the following measurements
must be implemented:
- Measure air intake through hole 2
(see fig. 19 section B);
- Measure flue gas temperature
and CO
2
through hole 1 (see fig. 19
section B).
Allow boiler to reach working
temperature before performing any
measurement.
Analyzer probes
Analyzer probes
Flue gas
discharge
Air intake
A
pic. 18
pic. 19
