Check incoming gas type and pressure to the Boiler
Reading can be made by checking pressure at the port shown to the right.
Set the Gas-Air Ratio (CO2 and/or O2 levels)
Remove flue gas test port plug on flue adaptor, and insert Combustion Analyzer.
To put the boiler into test mode press the button until the display shows . Briefly press the button, the display should show signaling that the boiler is now in high fire.
Remove the grey cap covering the throttle screw and adjust the Air Mix Throttle screw (using a Slotted screw driver) shown below as required to achieve CO2 of 9.4% for natural gas or 11.0% for Propane. Allow enough time for sample to travel through the test hose to reach the tester.
Press the button once, boiler display should show signaling the boiler is now in low fire. Remove adjustment screw cap from gas valve using a 4mm allen wrench. Make adjustment on the adjustment screw shown below until CO2 is 8.6% for natural gas or 10.4% for propane.
Once low fire adjustments are complete, put the boiler back into high fire by pressing the button until the boiler control is showing . Verify maximum CO2 reading once again.
Record the CO2, O2, and CO (should be under 200ppm) levels at minimum and maximum output on the commissioning log. Reinstall flue test port plug, gas valve screw cover and air throttle cover. Repeatedly press the button until the light goes out. The display will go back to showing the supply temperature.
Refer to this chart for proper CO2 and O2 levels. Remember CO should always be below 200ppm.
Note: CO2 gives a more accurate setting than an O2 setting, so if you have a tester for both, use the CO2.
Are you a homeowner or own a commercial property? Check out mybryantdealer.com/ to find a Bryant dealer near you!