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If you lack the necessary skills required to service this water
heater properly, or if you have diffi culty following the instructions,
you should not proceed. Have a qualifi ed service technician
perform the maintenance of this water heater.
Anode Rod Inspection
See also "Smelly Water" on page 1.
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, hydronic heating devices, and water softening methods
can increase the rate of anode rod depletion. 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. CAUTION: Do
not remove this rod permanently as it will void any warranties. A
special anode rod may be available 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 anode rod should be inspected after a maximum of three
years and annually thereafter until the condition of the anode
rod dictates its replacement. 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 shows signs of either or both it should be
replaced (Figure 16). NOTE: Whether re-installing or replacing
the anode rod, check for any leaks and immediately correct if
found.
SERVICE AND ADJUSTMENT
Follow these steps to replace the anode:
1. Turn off power 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 of water from tank. (Refer to
"Draining and Flushing" for proper procedures). Close drain
valve.
4. Remove old anode rod.
5. Use Tefl on
tape or approved pipe sealant on threads and
®
install new anode rod.
6. Turn on water supply and open a nearby hot water faucet
to purge air from water system. Check for any leaks and
immediately correct any if found.
7. Restart the water heater as directed in this manual.
NOTE: The water heater will conduct a system diagnostic
prior to operation. See the Repair Parts Illustration for anode
rod location.
Tefl on
is a registered trademark of E. I. du Pont de Nemours
®
and Company.
Temperature-Pressure Relief Valve Operation
The temperature-pressure relief valve must be manually operated
at least once a year.
The temperature-pressure relief valve must be manually operated
at least once a year. Caution should be taken to ensure that
(1) no one is in front of or around the outlet of the temperature-
pressure relief valve discharge line, and (2) the water manually
discharged will not cause any property damage or bodily injury.
The water may be extremely hot.
19
FIGURE 16
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