AO Smith Circulating Water Heaters BTP-200-300

Flush the heater by opening the drain valve and allowing two gallons of water to drain. Keep the inlet water valve open to maintain pressure in the tank.

Shut off the gas and drain the heater before opening the cleanout.

Remove the outer cover plate from the lower side of the heater jacket.

Remove the six hex head screws securing the tank cleanout plate and remove the plate.

Remove lime, scale, or sediment, taking care not to damage the glass lining.

Inspect the cleanout plate gasket. If a new gasket is required, refer to the replacement parts list for the item number.

Install the cleanout plate. Ensure the plate is drawn up tight by securely tightening the screws.

Replace the outer jacket cover plate.

Keep the area around the burner clear and free of combustible materials, gasoline or other flammable liquids or vapors.

Do not obstruct burner air openings or ventilation grilles for combustion air.

The main burner flames should be visually checked once a year for proper operation. This can be observed through the observation port on the burner housing. Burner flame should be blue.

DO NOT use the observation port on the side of the tank to inspect the burner flame.

Add a few drops of no. 20 non-detergent oil (BTP-139/A thru -370/A) into the oil tubes once every three months.

At least annually, contact a qualified service technician for a burner readjustment, cleaning and other than routine maintenance.

Should the main burner or burner air openings require cleaning, remove the burner and clean with a soft brush.

Clean main burner orifice with a suitable soft material.

Sign off on the 1 Yearly Burner Check

Turn off the electrical supply to the water heater

Ensure the cold water inlet valve is open

Open a nearby hot water faucet and let the water run until the water is no longer hot. Then close the hot water faucet

Connect a hose to the drain valve and terminate it to an adequate drain

Ensure the drain hose is secured before and during the entire flushing procedure. Flushing is performed with system water pressure applied to the water heater

Open the water heater drain valve to flush the storage tank

Flush the water heater storage tank to remove sediment and allow the water to flow until it runs clean

Close the water heater drain valve when flushing is completed

Warning: Handle UN•LIME with care and follow instructions on the label

Dealer or distributor from whom UN•LIME was obtained

Select the UN•LIME part number ordered

Is this procedure being performed in Canada?

If yes, UN•LIME is not available for use in Canada.

Was the handling instructions on the label of the product observed?

Sign off on the deliming solvents procedure

Note: The heater is equipped with a double acting barometric draft control. This control assembly is factory adjusted to automatically regulate the chimney draft imposed on the unit.

Does the damper gate pivot freely in the ring guides?

Examine the venting system every six months for obstructions and/or deterioration of the vent piping.

Any obstructions or deterioration in the vent piping?

Remove all soot or other obstructions from chimney which will retard free draft.

Was the chimney cleaned from soot or other obstructions?

Sign off on the venting system and barometric draft control maintenance