Instructions for the installer
35
3.7
Checking combustion efficiency
3.7.1 Flue cleaning function
•
The boiler features a flue cleaning function which must be used to measure combustion efficiency during operation and to adjust
the burner.
•
To activate the flue cleaning function, press and hold the buttons “Info” and “Reset” simultaneously for 5 seconds. The flow tempe-
rature and the
symbol are shown on the LCD.
•
When the flue cleaning function is activated with the boiler in "WINTER" or "HEATING ONLY" mode, the boiler performs the ignition
sequence and then operates at a fixed power output predetermined by the parameter
P1
(maximum CH output).
•
To exit the flue cleaning mode, press “Reset” or wait 15 minutes.
3.7.2 Measurement procedure
Coaxial duct system
In order to verify combustion efficiency the following measurements must be implemented:
• assess combustion air temperature from opening 1 (see ref. (A)
Fig. 16 Examples of flue gas testing points , for sealed chamber
boilers provided with pipes with preset holes).
•
assess flue gas temperature and CO2 quantity from no. 2 opening (see ref. (A) Fig. 16 Examples of flue gas testing points , for
sealed chamber boilers provided with pipes with preset holes).
Carry out specific measurements when the boiler has stabilised.
Split ducts system
In order to verify combustion efficiency the following measurements must be implemented:
• assess combustion air temperature from opening 2 (see ref. (B)
Fig. 16 Examples of flue gas testing points , for sealed chambers
provided with pipes with preset holes).
•
assess flue gas temperature and CO2 quantity from no. 1 opening (see ref. (B) Fig. 16 Examples of flue gas testing points , for
sealed chamber boilers provided with pipes with preset holes).
Carry out specific measurements when the boiler has stabilised.
ANALYZER PROBES
ANALYZER PROBES
Fig. 16 Examples of flue gas testing points
