American Water Heater 318935-003 - Manual (Page 19)

19
Burner Flames
Inspect the burner flames through the viewport. Flames
should be very small with a blue haze and small amounts
of yellow or orange at the edges. After several minutes
of operation, the burner screen may glow red. If large
flames are observed at any time, shut-off unit and call a
qualified person.
Water Temperature Stacking
Stacking occurs when a series of short draws of hot water
(3 gallons or less) are taken from the water heater tank.
This causes increased cycling of the burner and can result
in increased water temperatures at the hot water outlet.
This water heater’s temperature control has been designed
to accurately regulate the water temperature. However,
under certain operating conditions, the water temperature
may temporarily exceed the dial setting. Consequently, in
addition to setting the temperature no higher than 120°F,
we recommend the installation of a mixing valve or an
anti-scald device in the hot water supply line or at the point
of use to further reduce the risk of scald injury. These
devices can be obtained from a plumbing service agency or
your retail supplier.
Emergency Shut Down
IMPORTANT: Should overheating occur or the gas supply
fails to shut off, turn off the water heater’s manual gas
control valve and call a qualified person.
Checking the Draft
After successfully lighting the water heater, allow the unit
to operate for 15 minutes and check the drafthood relief
opening for proper draft. Make sure all other appliances
in the area are operating and all doors are closed when
performing the draft
test. Pass a match
flame around the
relief opening of the
drafthood. A steady
flame drawn into the
opening indicates
proper draft. If
the flame flutters
or is blown out,
combustion products
are escaping from
the relief opening. If this occurs, do not operate the water
heater until proper adjustments or repairs are made to the
vent pipe system and/or air supply requirements.
Figure 17
Match
Relief
Opening
Drafthood
Figure 18
Flame Characteristics
Correct flame
soft blue
Burn Hazard
Do not touch vent.
Doing so can result in burns.
WARNING