Atag BC100124, Appliance Technical Manual

Checking combustion CO

2

The CO

2

 percentage is set in the factory. This has to be checked during commissioning, 

inspection, maintenance and in case of a failure.

CO

2

 High Load reading

CO

2

 Low Load reading

Finally, the CO

2

 percentage at low load must 

be checked:
•  Press on the 

DHW

 - button until the minimum 

value (0%) has been reached (low load)

This can be verified by means of the following action:

•  Set the external controls to call for heat
•  Make sure the boiler is operational and can get rid of the heat it produces
•  Calibrate the flue gas analyser
•  Place the lance of the flue gas analyser into the flue gas test point

•  Press both 

+

 buttons for 6 seconds

  When the flame symbol and supply water temperature appears in the display the boiler  
  will be in 

max heat output CH

.

•  Press 1x the 

eco

 - button; the display shows:

  1.  Flow temp
  2. Fan speed

•  Press both 

+

 buttons again for 6 seconds;

  The boiler will switch to 

max heat output DHW

 for iC range or again 

max heat output  

  CH

 for iS & iR range.

•  Press 1x the 

eco

 - button; the display shows:

  1.  Flow temp
  2.  XX% (heat capacity)
  3.  Fan speed

Then with the 

+ / - 

button for DHW you can go to a different load, anything between full (100%) 

and low load (0%)

°C

NOTE:

 UNDER ALL CIRCUMSTANCES THE CO

2

 AT LOW LOAD MUST BE LOWER THAN THE CO

2  

AT FULL LOAD.

End of measuring:

•  Press the 

ESC

 button (         button).

The device switches off. The display shows  
for 2 seconds code 180 or 181.  
This complete the procedure.

FULL LOAD

NATURAL GAS (G20)

PROPANE GAS (G31)

CO

2

Nominal 9.0%

Nominal 10.3%

Minimum 8.6% – Maximum 9.6%

Minimum 9.9% – Maximum 11.0%

If required, you 
may turn the 
setting screw to 
set the correct CO

2 

percentage.

NATURAL GAS (G20)

LPG (G31)

Full load recorded

Accepted low load range

Full load recorded

Accepted low load range

9.6%

9.3% – 7.5%

11.0%

10.9% – 8.9%

9.5%

9.2% – 7.5%

10.9%

10.8% – 8.9%

9.4%

9.1% – 7.5%

10.8%

10.7% – 8.9%

9.3%

9.0% – 7.5%

10.7%

10.6% – 8.9%

9.2%

8.9% – 7.5%

10.6%

10.5% – 8.9%

9.1%

8.8% – 7.5%

10.5%

10.4% – 8.9%

9.0%

8.7% – 7.5%

10.4%

10.3% – 8.9%

8.9%

8.6% – 7.5%

10.3%

10.2% – 8.9%

8.8%

8.5% – 7.5%

10.2%

10.1% – 8.9%

8.7%

8.4% – 7.5%

10.1%

10.0% – 8.9%

8.6%

8.3% – 7.5%

10.0%

9.9% – 8.9%

9.9%

9.8% – 8.9%

°C

18