Maintenance; Maintenance Schedule - A.O. Smith 101 Series Instruction Manual

general
keep appliance area clear and free from combustible materials,
gasoline and other flammable vapors and liquids. See Locating
The Water Heater on page 11.
Water heater maintenance includes periodic tank flushing and
cleaning, and removal of lime scale. The water heater should be
inspected and adjusted to maintain proper combustion. See initial
Start Up on page 50. A periodic inspection of the venting system
should be made. Where used, water circulating pump(s) should
be oiled according to the pump manufacturers recommendations.
precautions
CAUTION
Do not operate the water heater if it has
been exposed to or exhibits the following:
•
Flooding at or above the level of the burner or controls.
•
External damage.
•
Firing without water.
•
Sooting.
Do not operate the water heater until all corrective steps
have been made by a qualified service agent.
Never operate the water heater without first being certain it is
filled with water and a properly sized and rated Temperature-
Pressure relief Valve is installed in the relief valve opening on
the water heater. See Temperature-Pressure relief Valve on
page 15.
Should overheating occur or the gas supply fail to shut off, turn of
the main Gas Shutoff valve. See Figure 52 on page 37.
Water heater maintenance includes periodic tank flushing and
cleaning, and removal of lime scale. The water heater should be
inspected and adjusted to maintain proper combustion. refer to
the following table. A periodic inspection of the venting system
should be made. Where used, the water circulating pump should
be oiled according to the pump manufacturer's recommendations.

maintenance

Explosion Hazard
Overheated water can cause
water tank explosion.
Properly sized temperature and
pressure relief valve must be
installed in the opening provided.

maintenance schedule

taBle 14
component operation
Tank Sediment
Removal
Tank Lime Scale
Removal
Anode rods inspection
Cleaning
T&P Valve Test operation
Vent System inspection
draining and flushing
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 on page 7 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. Connect a hose to the water heater drain valve and terminate
it to an adequate drain.
6. Close the cold water inlet valve.
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 tank perform the following steps:
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.
60
interVal reQuired
Semi Annually Flushing
Semi Annually UN-LImE®
Annually Clean Scale
Deposits
Semi Annually Test
Annually Termination
Screens Clean
Reseal/Repair
Burn harzard.
Hot water discharge.
Keep hands clear of drain
valve discharge.