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• Do not cover the instruction manual. Keep it on the side of the
water heater or nearby for future reference.
• Do not allow insulation to come within 2" (5 cm) of the burners,
to prevent blockage of combustion air flow to the burners.
• Do not allow insulation to come within 9" (23 cm) of floor,
(within 2" (5 cm) of bottom cover) to prevent blockage of
combustion air flow to the burners.
• Do inspect the insulation blanket frequently to make sure it
does not sag, thereby obstructing combustion air flow.
• Do obtain new labels from A.O. Smith for placement on the
blanket directly over the existing labels.
HIGH ALTITUDE INSTALLATIONS
WARNING
INSTALLATIONS ABOVE 2000 FEET (610 METERS) REQUIRE
REPLACEMENT OF THE BURNER ORIFICES IN ACCORDANCE
WITH SECTION 8.1.2 OF THE NATIONAL FUEL GAS CODE (ANSI
Z223.1). FOR CANADIAN INSTALLATIONS CONSULT
CANADIAN INSTALLATIONS CODES AND CAN/CSA B149.1-00.
FAILURE TO REPLACE THE ORIFICES WILL RESULT IN
IMPROPER AND INEFFICIENT OPERATION OF THE APPLIANCE
RESULTING IN THE PRODUCTION OF INCREASED LEVELS
OF CARBON MONOXIDE GAS IN EXCESS OF SAFE LIMITS
WHICH COULD RESULT IN SERIOUS PERSONAL INJURY OR
DEATH.
You should contact your gas supplier for any specific changes
which may be required in your area.
As elevation above sea level is increased, there is less oxygen
per cubic foot of air. Therefore, the heater input rate should be
reduced at high altitudes for satisfactory operation with the
reduced oxygen supply. Failure to make this reduction would
result in an overfiring of the heater causing sooting, poor
combustion and/or unsatisfactory heater performance.
U.S. REQUIREMENTS
Ratings specified by manufacturers for most appliances apply
for elevations up to 2000 feet (610 m). For elevations above
2000 feet (610), ratings must be reduced at the rate of 4% for
each 1000 feet (305 m) above sea level. For example, if a heater
is rated at 120,000 Btuh (35 Kwh) at sea level, to rate the heater
at 4000 feet (1219 m), you subtract 4 (once for each thousand
feet) x 04 (4% input reduction) x 120,000 (original rating) from
the original rating. Therefore, to calculate the input rating at
4,000 feet (121.9 m): 4 x .04 x 120,000 =19,200 Btuh (5.6 Kwh),
120,000 (35 Kwh) - 19,200 (5.6 Kwh) = 100,800 Btuh (29.4 Kwh).
At 6000 feet (1829 m) the correct input rating should be 91,200
Btuh (26.7 Kwh).
CANADIAN REQUIREMENTS
Appliances with inputs up to and including 400,000 BTU (117.2
Kw) must be factory equipped with orifices for operation at
specific elevations. Standard (sea level) orifices permit operation
up to 2000' (610 m) elevation. For operation between 2000' (610
m) and 4500' (1370 m) specify "HIGH ALTITUDE OPERATION"
when ordering the heater(s). For operation above 4500' (2370
m) consult factory before ordering.
Field conversion for operation at altitudes other than
that specified on the heater rating plate is not permitted.
The input reduction is primarily achieved by reducing the size of
the main burner orifices. To do this, the main burner orifices
require replacement with orifices sized for the particular
installation elevation. Correct orifice sizing and parts may be
obtained from A.O. Smith Water Products Company. When
ordering, be sure to state the model number and the altitude of
the location where the water heater is being installed.
Upon completion of derating of the heater, adjustment to the gas
pressure regulator may be required. See CHECKING THE
INPUT section in this manual for inlet and manifold pressure
requirements.
Also due to the input rating reduction required at high altitudes,
the output rating of the appliance is reduced and should be
compensated for in the sizing of the equipment for application.
FEATURES
THE ELIMINATOR
(SELF-CLEANING SYSTEM)
These units include The Eliminator (Self-Cleaning System)
installed in the front water inlet. See figure 2. The Eliminator
must be oriented correctly for proper function. There is a marked
range on the pipe nipple portion of the Eliminator, that must be
aligned with the top of the inlet spud. A label above the jacket
hole has an arrow that will point to the marked portion of the pipe
nipple if the orientation is correct.
within the marked range on the pipe nipple, adjust the pipe
nipple to correct. A pipe union is supplied with the Eliminator to
reduce the probability of misaligning the Eliminator accidentally
while tightening the connection to the inlet water supply line.
Improper orientation of the Eliminator can cause poor
performance of the heater and can significantly reduce outlet
water temperatures during heavy draws.
NOTE: The inlet tube may have 1, 3 or 7 cross-tubes.
For proper function, The Eliminator must be oriented correctly.
There is a marked range on the pipe nipple that must be aligned
with the top of the inlet spud (check for label on the appliance) to
assure proper orientation. Please check to confirm that the
marked range is in alignment with the top of the spud. A pipe
union is supplied with The Eliminator to help eliminate the
possibility of changing the orientation by accidentally over-
tightening the inlet supply line. Improper orientation of The
Eliminator may cause temperature build-up issues or spells of
colder than usual water temperatures.
HIGH LIMIT SWITCH (E.C.O.)
The dual bulb controller (fig. 3) contains the high limit (energy
cutoff) sensor. The high limit switch interrupts main burner gas
flow should the water temperature reach 205
In the event of high limit switch operation, the appliance cannot
be restarted unless the water temperature is reduced by at least
20
F (11°C) and the high limit reset button on front of limit control
0
(fig. 3) is depressed.
6
If the arrow does not point
FIGURE 2
°
F (96°C).
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