A.O. Smith Copper Boiler DB-1080

Ignition System Safety Shutoff Devices Check

Close the pilot adjusting valve on the left side of the manifold

Did the main burners and pilot extinguish within four seconds?

Did the spark igniter on the pilot assembly begin sparking?

If System Does Not Operate Correctly

Discontinue gas supply by closing main manual shutoff

Call a qualified serviceman to correct the situation and describe the issue

Ensure the boiler is turned off and cooled down

Is the area around the boiler free from lint and debris?

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

Check that the flow of combustion and ventilation air to the boiler is not obstructed

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

Is the area around the boiler clean and free from debris?

Ensure water softening equipment is operational

Check for lime build-up in the inlet/outlet manifold through the pressure relief valve tapping

Has there been a change of approximately 5°F in the normal temperature rise through the boiler?

Obtain UN•LIME from dealer or distributor

Read the instructions on the label of the UN•LIME container

Ensure all necessary equipment is made of copper or brass

Follow the typical piping arrangement for gravity deliming as shown in Figure 29

Shut off all electric to the unit

Disconnect pilot line connection at main burner

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

Is the manifold pressure within the acceptable range?

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?