A.O. Smith Residential Power Vent Gas Water Heaters with Hot Surface Ignition Housekeeping

Periodic Maintenance (cont’d)

L.P. Gas Control Valve & Burner Assembly Replacement Information

WARNING

PROPANE (L.P.) GAS CONTROL VALVE AND BURNER ASSEMBLY REPLACEMENT INFORMATION.

For Propane (L.P.) Gas Models Only:

Your water heater is equipped with a Propane (L.P.) gas control valve and a main burner assembly with left hand threads for the following fittings and their connections.

(1)The connection between the manifold and the gas control valve (A to B) are left hand threads.

(2)The connection between the main burner orifice and the manifold (C to D) are left hand threads.

For ordering these replacement parts, please refer to the “Repair Parts” section of this manual.

A

B

C

D

Housekeeping

Vacuum around base of water heater for dust, dirt, and lint on a regular basis.

Anode Rod Inspection

The anode rod is used to protect the tank from corrosion. Most hot water tanks are equipped with an anode rod. The submerged rod sacrifices itself to protect the tank. Instead of corroding the tank, water ions attack and eat away the anode rod. This does not affect the water’s taste or color. The rod must be maintained to keep the tank in operating condition.

Anode deterioration depends on water conductivity, not necessarily water condition. A corroded or pitted anode rod indicates high water conductivity and should be checked and/or replaced more often than an anode rod that appears to be intact. Replacement of a depleted anode rod can extend the life of your water heater. Inspection should be conducted by a qualified technician, and at a minimum should be checked annually after the warranty period.

Temperature-Pressure Relief Valve Operation

The temperature-pressure relief valve must be manually operated at least once a year.

TEMPERATURE-PRESSURE

RELIEF VALVE

DISCHARGE PIPE

WARNING

When checking the temperature-pressure relief valve operation, make sure that (1) no one is in front of or around the outlet of the temperature-pressure relief valve discharge line, and (2) that the water manually discharged will not cause any property damage because the water may be extremely hot.

If after manually operating the valve, it fails to complete- ly reset and continues to release water, immediately close the cold water inlet to the water heater, follow the drain- ing instructions, and replace the temperature-pressure relief valve with a new one.

Failure to install and maintain a new properly listed tem- perature-pressure relief valve will release the manufacturer from any claim which might result from excessive tempera- ture or pressure.

WARNING

INSTALLED IN SUITABLE AREA: To insure sufficient ventilation and combustion air supply, proper clear- ances from the water heater must be maintained. See “Locating the New Water Heater” section. Combustible materials such as clothing, cleaning materials, or flammable liquids, etc. must not be placed against or adjacent to the water heater which can cause a fire.

WARNING

If the temperature-pressure relief valve on the appliance weeps or discharges periodically, this may be due to thermal expansion. Your water heater may have a check valve installed in the water line or a water meter with a check valve. Consult the water supplier and/or plumbing contractor for further information. Do not plug the tem- perature-pressure relief valve.

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