DISHWASHING MACHINE REQUIREMENT
All dishwashing machines meeting the National Sanitation Foundation requirements are designed to operate with water flow pressures between 15 and 25 pounds per square inch. Flow pressures above 25 pounds per square inch, or below 15 pounds per square inch, will result in improperly sanitized dishes. Where pressures are high, a water pressure reducing or flow regulating control valve should be used in the 180°F line to the dishwashing machine, and should be adjusted to deliver water between these limits.
The National Sanitation Foundation also recommends circulation of 180°F 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°F water at the point of take-off to the dishwashing machine. Adjust flow by means of the plug cock in the circulating line. (See installation diagrams.)
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.
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 operated. Please refer to manufacturer's instructions.
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, GAS SUPPLY AND ELECTRICAL WORK ARE REQUIRED.
INSULATION BLANKETS
Insulation blankets available to the general public for external use on gas water heaters are not approved for use on your A.O. Smith water heater. The purpose of an insulation blanket is to reduce the standby heat loss encountered with storage tank water heaters. Your A.O. Smith water heater meets or exceeds the ASHRAE/IES 90.1b 1992 standards with respect to insulation and standby loss requirements, 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, or the upper 15" of the water heater, as this will interfere with safe operation.
•Do not cover the temperature & pressure relief valve.
•Do not cover the instruction manual. Keep it on the side of the water heater or nearby for future reference.
•Do obtain new labels from A.O. Smith for placement on the blanket directly over the existing labels.
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,OTHERFLAMMABLELIQUIDSORENGINEDRIVENEQUIPMENT OR VEHICLES ARE STORED, OPERATED OR REPAIRED. FLAMMABLE VAPORS ARE HEAVY AND TRAVEL ALONG THE FLOOR AND MAY BE IGNITEDBYTHEHEATER’SIGNITERORMAINBURNERFLAMESCAUSING FIREOREXPLOSION.SOMELOCALCODESPERMITOPERATIONOFGAS APPLIANCES IF INSTALLED 18 INCHES OR MORE ABOVE THE FLOOR. THISMAYREDUCETHERISKIFLOCATIONINSUCHANAREACANNOTBE AVOIDED.
THEHEATERSHALLBELOCATEDORPROTECTEDSOITISNOTSUBJECT TO PHYSICAL DAMAGE BY A MOVING VEHICLE.
DO NOT LOCATE THE HEATER WHERE NOISE FROM THE EXHAUST OR INTAKEWILLBEOBJECTIONABLE.THISINCLUDESLOCATIONSCLOSETO OR ACROSS FROM WINDOWS AND DOORS. AVOID ANCHORING THE VENT AND INTAKE PIPES DIRECTLY TO FRAMED WALLS, FLOORS OF CEILINGS UNLESSRUBBER ISOLATION PIPE HANGERS ARE USED. THIS PREVENTSANYVIBRATIONSFROMBEINGTRANSMITTEDINTOTHELIVING SPACES.
WARNING
FLAMMABLE ITEMS, PRESSURIZED CONTAINERS OR ANY OTHER POTENTIAL FIRE HAZARDOUS ARTICLES MUST NEVER BE PLACED ON OR ADJACENT TO THE HEATER. OPEN CONTAINERS OF FLAMMABLE MATERIALSHOULDNOTBESTOREDORUSEDINTHESAMEROOMWITH THEHEATER.
When installing the heater, consideration must be given to proper location. Location selected should be as close to the intake and exhaust termination points as practicable, with adequate air supply and as centralized with the piping system as possible.
THE HEATER MUST NOT BE LOCATED IN AN AREA WHERE IT WILL BE SUBJECTTOFREEZING.
LOCATE IT NEAR A FLOOR DRAIN. THE HEATER SHOULD BE LOCATED IN AN AREA WHERE LEAKAGE FROM THE HEATER OR CONNECTIONS WILL NOTRESULTINDAMAGETOTHEADJACENTAREAORTOLOWERFLOORS OFTHESTRUCTURE.
When such locations cannot be avoided, it is recommended that a suitable drain pan, adequately drained, be installed under the appliance.
WARNING
THISWATERHEATERISACONDENSINGUNITANDREQUIRESADRAINTO BE LOCATED IN CLOSE PROXIMITY TO ALLOW THE CONDENSATE TO DRAIN SAFELY. THE CONDENSATE DRAINS FROM THE UNIT AT THE EXHAUST ELBOW LOCATED AT THE BOTTOM OF THE UNIT. NOTE: IT IS IMPORTANT THAT THE CONDENSATE HOSE NOT BE ELEVATED ABOVE THEEXHAUSTELBOW(SEEFIGURE3).THECONDENSATEBUILD-UPWILL BLOCK THE EXHAUST OUTLET, WHICH WILL CAUSE IMPROPER OPERATION.
FIGURE 3
