Where is the CO sample ideally taken from?

The CO sample is ideally taken as close to the burner as possible because this location provides the most accurate representation of the combustion process taking place at that point. By sampling near the burner, the test can detect the immediate effects of combustion on carbon monoxide production, which is essential for assessing the appliance's efficiency and safety. High levels of CO can indicate improper combustion, which can be due to issues such as insufficient air supply or incorrect burner settings. Sampling at this point allows technicians to make necessary adjustments or repairs to optimize performance and reduce risks associated with carbon monoxide exposure.

In contrast, sampling near the draft diverter, from ambient air, or at the chimney exit point may yield misleading results. These locations can be affected by various factors, including dilution with outside air, mixing with other combustion gases, or secondary emissions, thereby not reflecting the combustion conditions at the burner itself. Therefore, taking the sample as close to the burner as possible is crucial for accurate diagnostics and ensuring safety standards are upheld.