A.O. Smith Copper Boiler DB-720

Check for any obstructions in the combustion and ventilation air flow.

Ensure the boiler area is clear of combustible materials, gasoline, and other flammable vapors and liquids.

Sweep the floor around the boiler carefully to reduce dust and dirt.

Is the area around the unit clean and free from lint and debris?

Verify that the flow of combustion and ventilation air to the boiler is unobstructed.

Is the boiler area clear and free from combustible materials after cleaning?

Main Burner Flame Characteristics Check

Verify the main burner displays the following characteristics

Are the burner characteristics not evident?

Check for accumulation of lint or other foreign material that restricts or blocks the air openings to the burner or boiler

Is the circulating pump properly sized for the application?

Oil the two motor oil cups with 10 or 12 drops of No. 20 non-detergent motor oil

Oil the pump oil cup with 2 or 3 teaspoonfuls of No. 20 non-detergent motor oil

Was the lubrication process completed successfully?

Describe any issues encountered during lubrication

Ensure all appliances remain connected to the common system are operational

Seal any unused openings in the common venting system

Visually inspect the venting system for proper size and horizontal pitch

Check for blockage, restriction, leakage, corrosion, and other deficiencies

Close all building doors and windows

Close all doors between the appliance space and other spaces

Turn on clothes dryers and any appliance not connected to the common venting system

Attach a pressure gauge or a manometer to the gauge port and check for correct manifold pressure.

Is the pressure within the limit indicated on the rating plate?

Enter the time in seconds to burn one cubic foot of gas (T).

Enter the gas heating value in Btu per cubic foot of gas (H).

Calculate the actual boiler input per hour (Btuh) using the formula (3600/T)xH.

Is the gas pressure at the burner manifold within the limit stated on the boiler rating plate?