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Adjusting barometric draft control6/14/2023 ![]() ![]() Visual Test Method (using a clear plastic tube or a sight glass installed in the oil supply line).Vacuum Test Method (should hold a vacuum of not less than 20” Hg for at least 30 minutes per NFPA 31 standards).Pressure Test Method (not more than 3 psig, in accordance with NFPA 31 standards).There are several methods that can be used to locate air leaks and bubbles. Consult the pump manufacturer’s specifications for line sizing and maximum lift conditions. Gasification can also be caused by high vacuum in the oil supply. GASIFICATION: Froth or bubbles are caused by some form of internal restriction in the oil supply line, such as a plugged fuel filter, a kink in the supply line, or sharp burrs on oil fittings. NEVER USE COMPRESSION FITTINGS IN AN OIL SUPPLY SYSTEM. Air leaks can be the result of using compression fittings. This could be due to air that is pulled in through the oil supply and purged through the nozzle, causing an erratic spray pattern. OIL SUPPLY PROBLEMS: Loose or defective fittings can cause air leaks that can contribute to pulsations during the burner operating cycle. For proper burner adjustments, refer to “Excessive Combustion Air” on page 2. PULSATIONS are caused by a loss of flame stability during the burner run cycle.ĮXCESSIVE COMBUSTION AIR: A properly adjusted oil burner can eliminate pulsations. 1 fuel oil (kerosene) will lower the viscosity and pour point. Use Beckett Start Helper part number 51621.īlending No. The use of a nozzle line heater will help a cold oil start. This will produce smaller droplets of fuel which are easier to vaporize and ignite. This condition can be improved by reducing the nozzle size (gph) while increasing the pump pressure (psig) to obtain the required firing rate for the application. Lower temperatures increase the oil viscosity, causing a significant impact on the ignition of the oil droplets. HIGH OIL VISCOSITY: Viscosity is resistance to flow. You have provided a margin to accommodate variables such as changing drafts, cold oil, or other factors that could be encountered during the heating season. ![]() Increase the air settings until the CO2 is reduced by 1 to 2 percentage points from the trace of smoke level, or the O2 is increased by 2 to 3 percentage points.At the trace of smoke level, measure the CO2 or O2.Set the burner air controls to obtain a trace of smoke level at a steady state condition, with the draft set to the appliance manufacturer’s specifications.Follow these four steps to properly adjust the burner: Beckett offers a multi-purpose T500 gauge to assist you in making proper electrode settings.ĮXCESSIVE COMBUSTION AIR: The burner must be adjusted to have the proper air-to-fuel ratio. If the appliance model is not found in the OEM Specification Guide, please contact Beckett Technical Service at 1-80 for further assistance.ĮLECTRODES NOT POSITIONED CORRECTLY: Proper electrode settings are essential. Consult the Beckett OEM ( Original Equipment Manufacturer) Specification Guide (part number 6711) to ensure the proper burner specifications have been applied. INADEQUATE STATIC PRESSURE: Verify the correct burner for the application. Sometimes a chimney cap can be helpful to lower the draft. If the draft remains high after the barometric damper has been adjusted, a second barometric damper could be considered. HIGH DRAFT: Adjust the barometric damper, if applicable. Search to see if there are any cleanouts left open in the chimney. Look for restrictions in the flues or the chimney. ![]() ![]() LOW DRAFT: Inspect the heat exchanger for any restrictions. RUMBLES AT START-UPĬOMBUSTION NOISE AT START-UP is a rumble that is heard at the beginning of the call for heat.ĭRAFT PROBLEMS: Follow the manufacturer’s specifications for draft measurements and adjust the barometric damper, if applicable. The following information is provided to help you effectively troubleshoot these areas. Combustion noise can occur in three major areas: at start-up, during the run cycle, and at shutdown. ![]()
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