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When desired adjustments are complete, reinstall the cap on the gas valve. CO readings should be less than 200 ppm. Start Up Note: There will be a time delay between adjustments on the gas valve and the response of the CO2 measuring instrument. Adjust the settings in small increments and allow the combustion readings to stabilize for at least 3 minutes before readjusting. High Fire CO2 Settings NATURAL GAS 8.5 - 9.0% CO2 PROPANE GAS 9.5 - 10.5% CO2 Low Fire CO2 Settings NATURAL GAS 6.5 - 7.5% CO