AO Smith Circulating Water Heaters BTP-150-140

DANGER! Burn hazard. Hot water discharge. Keep clear of Temperature-Pressure Relief Valve discharge outlet.

It is recommended that the Temperature-Pressure Relief Valve should be checked to ensure that it is in operating condition every 6 months.

When checking the Temperature-Pressure Relief Valve operation, make sure that (1) no one is in front of or around outlet of Temperature-Pressure Relief Valve discharge line, and (2) that water discharge will not cause any property damage, as water may be extremely hot. Use care when operating valve as valve may be hot.

Check if the pressure relief valve seats properly and operates freely

If after manually operating the valve, it fails to completely reset and continues to release water, immediately close the cold water inlet to the water heater and drain the water heater.

Replace the Temperature-Pressure Relief Valve with a properly rated/sized new one, if it fails to reset.

If the Temperature-Pressure Relief Valve on water heater weeps or discharges periodically, this may be due to thermal expansion.

NOTE: Excessive water pressure is the most common cause of Temperature-Pressure Relief Valve leakage. Excessive water system pressure is most often caused by 'thermal expansion' in a 'closed system.' The Temperature-Pressure Relief Valve is not intended for the constant relief of thermal expansion.

Temperature-Pressure Relief Valve leakage due to pressure build up in a closed system that does not have a thermal expansion tank installed is not covered under the limited warranty. Thermal expansion tanks must be installed on all closed water systems.

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

CAUTION! Property Damage Hazard

Inspection and replacement of anode rod required.

The anode rod is used to protect the tank from corrosion.

Anode rod deterioration depends on water conductivity, not necessarily water condition.

Inspection should be conducted by a qualified technician, and at a minimum should be checked annually after warranty period.

Artificially softened water is exceedingly corrosive because the process substitutes sodium ions for magnesium and calcium ions.

The anode rod should be inspected after a maximum of three years and annually thereafter until condition of anode rod dictates its replacement.

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 tightening the screws securely.

Replace the outer jacket cover plate.

Turn off the electrical supply to the water heater

Turn off the gas supply at the Main Gas Shutoff Valve if the water heater is going to be shut down for an extended period

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

Close the cold water inlet valve to the water heater

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

Open the water heater drain valve and allow all the water to drain from the storage tank

Close the water heater drain valve when all water in the storage tank has drained

Close the hot water faucet opened in Step 4