American Water Heater BCL3 85T390 6NOX - Manual (Page 32)

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Contact the local water heater supplier or service agency for
further information concerning an Anode replacement Kit and
this chlorination treatment.
If hot water odor persists after anode replacement and chlorination
treatment, we can only suggest that chlorination or aeration of
the water supply be considered to eliminate the water problem.
Do not remove the anode leaving the tank unprotected. by doing
so, all warranty on the water heater tank is voided.
“air” in hot water fauCets
HYDrOGen GAS: Hydrogen gas can be produced in a hot
water system that has not been used for a long period of time
(generally two weeks or more). Hydrogen gas is extremely
flammable and explosive. To prevent the possibility of injury
under these conditions, we recommend that the hot water
faucet located farthest away from the water heater be opened
for several minutes before any electrical appliances which
are connected to the hot water system are used (such as a
dishwasher or washing machine). If hydrogen gas is present,
there will probably be an unusual sound similar to air escaping
through the pipe as the hot water faucet is opened. There
must be no smoking or open flame near the faucet at the time
it is open.
high water temperature shut off system
This water heater is equipped with a manual reset type high
limit (energy Cutout) switch. The high limit switch interrupts
the main burner gas flow should water temperature reach
203°F (95°C).
In the event of high limit switch operation, the water heater
cannot be restarted unless the water temperature is reduced to
approximately 120°F (49°C). The high limit reset button on the
front of the thermostat then needs to be depressed. See Figure 2
for the location of the reset button.
start up Conditions
smoke/odor
It is not uncommon to experience a small amount of smoke and
odor during the initial start-up. This is due to burning off of oil
from metal parts, and will disappear in a short while.
strange sounds
Possible noises due to expansion and contraction of some metal
parts during periods of heat-up and cool-down do not necessarily
represent harmful or dangerous conditions.
Condensation causes sizzling and popping within the burner area
during heating and cooling periods and should be considered
normal.
operational Conditions
hot water odor
In each water heater there is installed at least one anode rod
for corrosion protection of the tank. Certain water conditions
will cause a reaction between this rod and the water. The most
common complaint associated with the anode rod is one of a
“rotten egg smell” in the hot water. The smell is a result of four
factors which must all be present for the odor to develop:
a. A concentration of sulfate in the supply water.
b. little or no dissolved oxygen in the water.
c. A sulfate reducing bacteria which has accumulated within the
water heater (this harmless bacteria is nontoxic to humans).
d. An excess of active hydrogen in the tank. This is caused by
the corrosion protective action of the anode.
Hot water odor may be eliminated or reduced in some water
heater models by replacing the anode(s) with one of less active
material, and then chlorinating the water heater tank and all
water lines.
for your information