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heater meets or exceeds the ASHRAE/IES 90.1b-1999 standards with
respect to insulation and standby loss requirement making an insulation
blanket unnecessary.
WARNING
Should you choose to apply an insulation blanket to this heater, you should
follow these instructions. Failure to follow these instructions can result in
fire, asphyxiation , serious personal injury or death.
•
Do not apply insulation to the top of the water heater, as this will interfere
with safe operation.
•
Do not cover the outer door, thermostat or temperature & pressure
relief valve.
•
Do not allow insulation to come within 2" (5cm) of the floor to prevent
blockage of combustion air flow to the burner.
•
Do not cover the instruction manual. Keep it on the side of the water
heater or nearby for future reference.
•
Do obtain new warning and instruction labels from A.O. Smith for
placement on the blanket directly over the existing labels.
•
Do inspect the insulation blanket frequently to make certain it does not
sag, thereby obstructing combustion air flow.
HIGH ALTITUDE INSTALLATIONS
WARNING
INSTALLATIONS ABOVE 2000 FEET (610 METERS) REQUIRE
REPLACEMENT OF THE BURNER ORIFICE IN ACCORDANCE
WITH SECTION 8.1.2 OF THE NATIONAL FUEL GAS CODE,
ANSI Z223.1/NFPA 54. FOR CANADIAN INSTALLATIONS CONSULT
CANADIAN INSTALLATIONS CODES AND CAN/CSA B149.1 -00.
FAILURE TO REPLACE THE ORIFICE 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 (610m). For elevations above 2000 feet (610), ratings
must be reduced at the rate of 4% for each 1000 feet (305m) above sea
level. For example, if a heater is rated at 78,000 Btuh (22.9 Kwh) at sea
level, to rate the heater at 4000 feet (1219m), you subtract 4 (once for
each thousand feet) x.04 (4% input reduction) x 78,000 (original rating)
from the original rating. Therefore, to calculate the input rating at 4,000
feet (1219m): 4 x .04 x 78,000 =12,480 Btuh (3.7 Kwh), 78,000 (22.9
Kwh) - 12,480 (3.7 Kwh) = 65,520 Btuh (19.2 Kwh). At 6000 feet (1829m)
the correct input rating should be 59,280 Btuh (17.4 Kwh).
CANADIAN REQUIREMENTS
Appliances with inputs up to and including 400,000 BTU (117.1kwh) must
be factory equipped with orifices for operation at specific elevations.
Standard (sea level) orifices permit operation up to 2000' (610m) elevation.
For operation between 2000' (610m) and 4500' (1370m) specify "HIGH
ALTITUDE OPERATION" when ordering the heater(s). For operation above
4500' (2370m) 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 also reduced and should be compensated for in
the sizing of the equipment for application.
CIRCULATING PUMP
A circulating pump is used when a system requires a circulating loop or
there is a storage tank used in conjunction with the heater. Refer to the
piping diagrams at rear of manual for electrical hookup information and
install in accordance with the latest version of the
National Electric Code
ANSI/NFPA No. 70. In Canada refer to Canadian Electrical Code CSA C22.1.
Only all bronze circulators are used with commercial water heaters. Although
circulators are oiled and operated by the manufacturer some circulators
must be oiled again before operating. Please refer to manufacturer’s
instructions.
DISHWASHING MACHINE REQUIREMENT
These appliances meet the National Sanitation Foundation Standard for
sanitary installations when used with the following leg kits, Part No’s. 6570-
0 and 6570-7.
All dishwashing machines meeting the National Sanitation Foundation
requirements are designed to operate with water flow pressures between
15 and 25 psi (103Kpa and 173 Kpa). Flow pressures above 25 psi
(173Kpa), or below 15 psi (103 Kpa), will result in improperly sanitized
dishes. Where pressures are high, a water pressure reducing or flow
regulating control valve should be used in 180
0
F(82°C) line to the
dishwashing machine, and should be adjusted to deliver water between
these limits.
The National Sanitation Foundation also recommends circulation of 180
0
F
(82°C) water. Where this is done, the circulation should be very gentle so
that it does not cause any unnecessary turbulence inside the water heater.
The circulation should be just enough to provide 180
0
F (82°C) water at the
point of take-off to the dishwashing machine. Adjust flow by means of the
plug cock in the circulating line.
INSTALLATION INSTRUCTIONS
REQUIRED ABILITY
INSTALLATION OR SERVICE OF THIS WATER HEATER REQUIRES
ABILITY EQUIVALENT TO THAT OF A LICENSED TRADESMAN IN THE
FIELD INVOLVED. PLUMBING, AIR SUPPLY, VENTING, ELECTRICAL
AND GAS SUPPLY WORK ARE REQUIRED.
LOCATING THE HEATER
WARNING
THERE IS A RISK IN USING FUEL BURNING APPLIANCES SUCH AS
GAS WATER HEATERS IN ROOMS, GARAGES OR OTHER AREAS
WHERE GASOLINE, OTHER FLAMMABLE LIQUIDS OR ENGINE
DRIVEN EQUIPMENT OR VEHICLES ARE STORED, OPERATED OR
REPAIRED. FLAMMABLE VAPORS ARE HEAVY AND TRAVEL ALONG
THE FLOOR AND MAY BE IGNITED BY THE HEATER’S PILOT OR MAIN
BURNER FLAMES CAUSING FIRE OR EXPLOSION. SOME LOCAL
CODES PERMIT OPERATION OF GAS APPLIANCES IF INSTALLED 18 INCHES