Settings for marathon
®
burners with mechanical linkage
dreizler A 3001 E - 18.12.2015 | A 2070 - 1.12 | EN - 09.11.2012
39
NOTICE:
All dreizler
®
burners are flame-tested on a burner test bench and have been preset for positios MIN and
MAX ex works. These presettings should in general be sufficient to run the burner smoothly to position MAX
and to then begin the fine tuning.
12.5 Burner adjustments
Burner adjustment to hygienic exhaust behaviour and optimised burning efficiency in MAX position (full
load)
After start-up in position MAX, you set the relevant gas pressure on the gas pressure governor of the
actuator SKP 25, and check the flow pressure on the gas meter.
On the manual damper on suction side, set the combustion air to position MAX.
NOTICE:
If the burner displays too little CO
2
content and too much CO content in the waste gas, the arrestable air
damper must be opened further due to air deficiency.
NOTICE:
In position MAX, the air damper L90 or L130 must be fully opened.
Only then will the entire air damper section be available on the pressure side for the required air flow ad-
justment.
Adjustment values:
CAUTION!
Even if 11% CO
2
can be set without CO generation, for safety reasons no more than a 10.5% CO
2
content
should be set!
12.6 Adjustment of combustion air in position MIN (small load)
Once the position MAX has been set with regards to hygiene, set the servomotor to position MIN.
Now finalise the required output of the small flame by way of the gas damper.
Loosen the gas damper shaft on the gas terminal lever with a screw driver and observe the measure-
ments on the gas meter.
Set a control ratio of 1:3 on the boiler, i.e. in position MIN, 1/3 of the output of position MAX.
Rule of thumb:
Upper nominal load 10% = Burner load
Rule of thumb for gas flow rate:
1m
3
natural gas = 9 kWh/m
3
Thermal unit
1m
3
Propane = 25 kWh/m
3
Thermal unit
CO2 content in waste gas (natural gas L/H) = approx. 10.0 to 10.5%
CO2 content in waste gas (Propane)
= approx. 11 to 12%
CO2 content in waste gas
= < 50ppm