Atag iC Economiser 27 - Checking Combustion Co

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 dierent 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 o. 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