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anode rod inspection
CAUTION
Property Damage Hazard
•
Avoid water heater damage.
•
Inspection and replacement of anode rod required.
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 tank,
water ions attack and eat away the anode rod. This does not affect
water's taste or color. The rod must be maintained to keep tank in
operating condition.
Anode rod 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 warranty period.
Artificially softened water is exceedingly corrosive because the
process substitutes sodium ions for magnesium and calcium ions.
use of a water softener may decrease the life of water heater tank.
The anode rod should be inspected after a maximum of three
years and annually thereafter until condition of anode rod dictates
its replacement. Anode replacement is not covered by warranty.
NOTe: artificially softened water requires the anode rod to be
inspected annually.
draining and flushing
Explosion Hazard
Temperature-Pressure Relief Valve
must comply with ANSI Z21.22-
CSA 4.4 and ASME code.
Properly sized temperature-
pressure relief valve must be
installed in opening provided.
Can result in overheating and
excessive tank pressure.
Can cause serious injury or death.
Burn harzard.
Hot water discharge.
Keep hands clear of drain
valve discharge.
It is recommended that the water heater storage tank be drained
and flushed every 6 months to reduce sediment buildup. The
water heater should be drained if being shut down during freezing
temperatures. See Features And Components in this manual for
the location of the water heater components described below.
to drain the water heater storage tank:
1. Turn off the electrical supply to the water heater.
2. 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.
3. ensure the cold water inlet valve is open.
4. Open a nearby hot water faucet and let the water run until the
water is no longer hot.
5. Close the cold water inlet valve to the water heater.
6. Connect a hose to the water heater drain valve and terminate
it to an adequate drain.
7. Open the water heater drain valve and allow all the water to
drain from the storage tank.
8. Close the water heater drain valve when all water in the
storage tank has drained.
9. Close the hot water faucet opened in Step 4.
10. If the water heater is going to be shut down for an extended
period, the drain valve should be left open.
to flush the water heater storage tank:
1. Turn off the electrical supply to the water heater.
2. ensure the cold water inlet valve is open.
3. Open a nearby hot water faucet and let the water run until the
water is no longer hot. Then close the hot water faucet.
4. Connect a hose to the drain valve and terminate it to an
adequate drain.
5. ensure the drain hose is secured before and during the entire
flushing procedure. Flushing is performed with system water
pressure applied to the water heater.
6. Open the water heater drain valve to flush the storage tank.
7. Flush the water heater storage tank to remove sediment and
allow the water to flow until it runs clean.
8. Close the water heater drain valve when flushing is completed.
9. remove the drain hose.
10. Fill the water heater - see Filling The Water Heater in this manual.
11. Turn on electrical supply to place water heater back in operation.
12. Allow the water heater to complete several heating cycles to
ensure it is operating properly.
recommended procedure for periodic
remoVal of lime deposits from tank type
commercial water heaters
The amount of calcium carbonate (lime) released from water is
in direct proportion to water temperature and usage, see chart.
The higher the water temperature or water usage, the more lime
deposits are dropped out of the water. This is the lime scale which
forms in pipes, heaters and on cooking utensils.
lime accumulation not only reduces the life of equipment but also
reduces efficiency of the heater and increases fuel consumption.
The usage of water softening equipment greatly reduces the
hardness of the water. However, this equipment does not always
remove all of the hardness (lime). For this reason it is recommended
that a regular schedule for deliming be maintained.
The time between cleaning will vary from weeks to months
depending upon water conditions and usage.
The depth of lime buildup should be measured periodically. Heaters
equipped with cleanouts will have about 2" of lime buildup when
the level of lime has reached the bottom of the cleanout opening. A
schedule for deliming should then be set up,based on the amount
of time it would take for a 1" buildup of lime. It is recommended that
the water heater initially be inspected after 6 months.
example 1:
Initial inspection after 6 months shows 1/2" of lime accumulation.
Therefore, the heater should be delimed once a year.
example 2:
Initial inspection after 6 months shows 2" of lime accumulation.
Therefore, the heater should be delimed every 3 months.
29
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