Ao-smith 315795-000 MH User Manual download pdf (Page 24)

ANODE ROD INSPECTION

Each water heater contains at least one anode rod, which will

slowly deplete (due to electrolysis) prolonging the life of the water

heater by protecting the glass-lined tank from corrosion. Adverse

water quality, hotter water temperatures, high hot water usage, and

water softening methods can increase the rate of anode rod deple-

tion. Once the anode rod is depleted, the tank will start to corrode,

eventually developing a leak.

Certain water conditions will cause a reaction between the anode

rod and the water. The most common complaint associated with

the anode rod is a “rotten egg smell” produced from the presence

of hydrogen sulﬁ de gas dissolved in the water. IMPORTANT: Do

not remove this rod permanently as it will void any warranties.

The parts list includes a special anode rod that can be ordered if

water odor or discoloration occurs. NOTE: This rod may reduce

but not eliminate water odor problems. The water supply system

may require special ﬁ ltration equipment from a water conditioning

company to successfully eliminate all water odor problems.

Artiﬁ cially softened water is exceedingly corrosive because the

process substitutes sodium ions for magnesium and calcium ions.

The use of a water softener may decrease the life of the water

heater tank.

The anode rod should be removed from the water heater tank every

3 years for inspection. NOTE: artiﬁ cially softened water requires the

anode rod to be inspected annually.

The following are typical (but not all) signs of a depleted anode rod:

• The majority of the rods diameter is less than 3/8”.

• Signiﬁ cant sections of the support wire (approx. 1/3 or

more of the anode rod’s length) are visible.

If the anode rod show signs of either or both it should be replaced.

NOTE: Whether re-installing or replacing the anode rod, check

for any leaks and immediately correct if

found.

In replacing the anode:

Turn off gas supply to the water heater.1.

Shut off the water supply and open a 2.

nearby hot water faucet to depressurize

the water tank.

Drain approximately 5 gallons of water 3.

from tank (Refer to “Draining” for proper

procedures). Close drain valve.

Remove old anode rod.4.

Use Teflon® tape or approved pipe 5.

sealant on threads and install new

anode rod.

Turn on water supply and open nearby 6.

hot water faucet to purge air from

water system. Check for any leaks and

immediately correct any if found.

Restart the water heater as directed under

“Operating Your Water weater.” See the Repair Parts Illustration for

anode rod location.

TEMPERATURE-PRESSURE RELIEF VALVE OPERATION

The temperature-pressure relief valve must be manually operated at

least once a year.

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 discharge

will not cause any property damage, as the water may be extremely

hot, see Figure 39.

FIGURE 39.

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, 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 service agency

for further information. Do not plug the temperature-pressure relief

valve.

DRAINING

The water heater should be drained if being shut down during freezing

temperatures. Also periodic draining and cleaning of sediment from

the tank may be necessary.

1. Turn the gas control knob to the “OFF” position.

2. OPEN nearby hot water faucets and leave open until the water is

no longer hot.

3. CLOSE the cold water inlet valve to the water heater.

4. Connect a hose to the drain valve and terminate to an adequate

drain or outdoors.

5. OPEN the water heater drain valve to allow for tank draining.

NOTE: If the water heater is going to be shut down and drained for

an extended period, the drain valve should be left open with hose

connected allowing water to terminate to an adequate drain.

EXPOSED

SUPPORT

WIRE

PITTED

ANODE

ROD

EXPOSED

SUPPORT

WIRE

FIGURE 38

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Ao-smith 315795-000 MH User Manual Page 24

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