A.O. Smith HYB-90N Anode Rod Replacement, Temperature-Pressure Relief Valve Operation, Motors

ANODE ROD REPLACEMENT

To replace the anode:

1.Turn off gas supply to the water heater.

2.Shut off the water supply and open a nearby hot-water faucet to depressurize the water tank.

3.Drain approximately 5 gallons (20 litres) of water from tank (Refer to “DRAINING THE TANK” for proper procedures.) Close drain valve.

4.Remove old anode rod.

5.Use Teflon® tape or approved pipe sealant on threads and install new anode rod.

6.Turn on water supply and open nearby hot-water faucet to purge air from water system.

7.Restart the water heater as directed under “Operating Your Water Heater”. See the “Parts Reference Illustration” for anode rod location.

TEMPERATURE-PRESSURE RELIEF VALVE OPERATION

FIGURE 36

The temperature-pressure relief valve lever must be operated at least once a year to ensure that the water ways are clear. 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.

2.The water discharge will not cause any property damage, as the water may be extremely hot.

3.A discharge line is connected to this valve, directing the flow of hot water from the valve to a proper placement for disposal.

If water does not flow freely when the lever is in the open position, replacement of the valve is required. Turn off the cold water inlet heater and call a qualified service man.

If after manually operating the valve (see Figure 36), it fails to completely reset and continues to release water, immediately close the cold water inlet to the water heater, follow the draining instructions, and replace the temperature-pressure relief valve with a new one.

If the temperature-pressure relief valve on the appliance weeps or discharges periodically, this may be due to thermal expansion. You may have a check valve installed in the water line or a water meter with a check valve. Consult your local water supplier or a qualified service agency for further information. Do not plug the temperature-pressure relief valve.

MOTORS

Motors are permanently lubricated and do not need periodic lubrication. Keep fan and motor free of dust and dirt by cleaning annually.

SNOW ACCUMULATION

Keep the area around flue terminal free of snow and ice. The appliance will not function properly if the intake air or exhaust is impeded (blocked or partially blocked) by obstructions.

CLEANING THE INLET WATER FILTER

The cold water inlet filter must be cleaned on a regular basis. The frequency of this cleaning is dependent on the quality of your local water supply. You will need to prepare a bucket to collect some of the draining water. The cold water inlet filter is located inside the door on the left-hand side of the heat engine. To access the inlet filter:

Access To

Door Pins

Door

Lock

FIGURE 37

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