Temperature Adjustment; Burner Adjustment; Burner Maintenance; Emergency Shut Down - American Standard 75-76 AS Operating, Installation And Service Manual

TEMPERATURE ADJUSTMENT

The temperature selector dial has been adjusted to its
lowest setting when shipped from the factory.
For energy-efficient operation of your water heater, the
recommended temperature setting is approximately 1 30°F.
Households with small children or invalids may require a 120°
F or lower temperature setting to reduce the risk of scald
injury. Some states require a lower temperature setting. Check
with your gas supplier for local requirements governing the
temperature setting. NOTE: The lower the temperature setting
the greater the energy efficiency, both to heat water and to
maintain its temperature during standby periods. Lower water
temperatures also extend the tank life. Remember, no water
heating system will provide exact temperatures at all times.
Allow a few days of operation at this setting to determine the
correct temperature setting consistent with your needs. NOTE:
This water heater, when set at the lower temperature setting,
is not capable of producing hot water of sufficient temperature
for sanitizing purposes.
During winter season or any cold period, you may desire a
higher temperature setting to adjust for the colder incoming
water. However, this adjustment may cause additional
condensation to form on the cooler tank surface. This does not
mean the tank is leaking. Refer to Page 8 for explanation of
this condition. During the summer months, the warmer
incoming water temperatures will benefit the performance of
your water heater and reduce the amount of condensation
developed.
Condensation does not mean that your tank is leaking. Over
40% of reported tank leaks on installation are proven to be
condensation. To avoid unnecessary inconvenience and
expense, make sure the tank is leaking before calling a service
person.
CAUTION: Setting the temperature selector dial higher
provides hotter water, which increases the risk of scald injury.
The water heater thermostat is constructed with a built-in shut-
off designed to shut off the gas supply to the main Burner and
pilot Burner in the event the pilot flame is extinguished for
any reason. The thermostat is also equipped with a high
temperature limit switch ECO (Energy Cut Off). The Energy
Cut Off will shut off all gas supplied to the Burner and pilot
Burner in the event the water temperature exceeds 180°F. The
Energy Cut Off switch is a single use switch and is not field
replaceable. Should the Energy Cut Off function (open), the
thermostat must be replaced before the water heater can be
placed in operation again.
VACATION/FREEZING TEMPERATURES __ If the
water heater is to remain idle for 30 days or more, or is subject
to freezing temperatures while shut off, the water heater and
piping should be drained (refer to Page 12), and the drain valve
should be left open. Refer to Hydrogen Gas Warning (Page 8).
GAS PRES S URE __ With the water heater in operation
(main burner on), the maximum supply pressure must not
exceed the specified value below, and the minimum supply
and normal manifold gas pressures are as follows:
S upply Pressure
Pressure
MAX.
Natural Gas: 10.5" W.C. 5" W.C.
L.P. Gas: 13.0" W.C. 11" W.C.
Manifold
MIN. NORMAL
4" W.C. - 4.7" W.C.
(see rating plate)
10" W.C.
Some models have values higher or lower than those noted
above. Refer to pressure noted on the label affixed to the front
of the water heater. Consult your local gas company or gas
supplier if correction is necessary.

BURNER ADJUSTMENT

There are no adjustments to this water heater (other than water
temperature selection). The thermostat (gas control valve) is
equipped for total regulation of the main burner and pilot gas
pressures.
Only qualified personnel should adjust the pressure regulator.

BURNER MAINTENANCE

At least once every three months visually check burner and
pilot flames and compare with the sketches below.
Observation of the gas flame should show the burner flame to
be a soft blue with the suggestion of slight yellow tips. A
flame of too light of a color may not be a carbonizing flame
and should be avoided. If this is suspected, turn the control to
the off position, allow combustion chamber to cool, and check
the top of the combustion chamber and burner for soot
deposits. If soot exists, clean the burner with soap and water.
If continued sooting occurs, refer to Trouble Symptoms,
Pages 14 and 15.

EMERGENCY SHUT DOWN

Should overheating occur or the gas supply fail to shut off,
turn off the manual gas control valve to the appliance and call
a qualified service person to check for the cause.
11
WARNING
M AI N BU R NE R
PI L OT BU R NE R
WARNING
130931 Rev April ʻ07