23
3.2.7 Checking combustion efficiency
In order to check combustion efficiency, turn no. 5 knob fully clockwise and completely open one or two domestic hot water taps so
that the boiler will operate at max. output.
3.2.7.1 Coaxial pipe system
In order to verify combustion performance the following measurements must be implemented:
- Measure air temperature (from no. 1 opening shown in pic. 16A for sealed chamber boilers with prearranged openings).
- Measure flue gas temperature and CO
2
concentration (from no. 2 opening shown in pic. 16A for sealed chamber boilers with prear-
ranged openings).
Perform measurements while the boiler is operating at working temperature.
Once the above procedure is completed, close the domestic hot water taps and position no. 5 knob (pic. 1) to the desired setting.
3.2.7.2. Split pipe system
In order to determine combustion performance the following measurements must be implemented:
- Measure air temperature (from no. 2 opening shown in pic. 16B for sealed chamber boilers with prearranged openings).
- Measure flue gas temperature and CO
2
concentration (from no. 1 opening shown in pic. 16B for sealed chamber boilers with prear-
ranged openings).
Perform measurements while the boiler is operating at working temperature.
Once the above procedure is completed, close the domestic hot water taps and position no. 5 knob (pic. 1) to the desired setting.
*
500
H min. = 150 mm
0
1
3
6
5
4
2
bar
1
3
5
4
2
bar
135
250 min.
45
500 mm
500 mm
0
1
3
6
5
4
2
bar
1
3
5
4
2
bar
Pic. 14 – Split pipe installation samples
Pic. 15 - Additional split pipe installation samples
Pic. 16 - Sample areas for combustion efficiency measurements
A
B
Example no. 2
Example no. 1
Analyzer
probes
Analyzer
probes
Air
Flue gas
162 mm
