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instruction manual
commercial gas water heaters
models Bcg3 & aBcg3
low nox series 108
installation - operation - ser Vice
- maintenance - limited warranty
www.americanwaterheater.com
complies with scaQmd low nox rule 1146.2
American Water Heater
Johnson City, TN 37605
Low Lead Content
WARNING: If the information in these
instructions is not followed exactly, a fire
or explosion may result causing property
damage, personal injury or death.
Do not store or use gasoline or other
fla
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t aBle of contents SAfe iNSTALLATioN, uSe AND SeRViCe .......................................... 3 WaTER HEaTER INsTalla TIoN ................................................... 20-23 GENERal saFETY INFoRMa TIoN ................................................... 4-5 Water Line Connections .................................................................. 20 Precautions ........................................................................................ 4 Water (Potable) Heating and Space He
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safe installation, use and ser Vice The proper installation, use and servicing of this water heater is extremely important to your safety and the safety of others. many safety-related messages and instructions have been provided in this manual and on your own water heater to warn you and others of a potential injury hazard. Read and obey all safety messages and instructions throughout this manual. it is very important that the meaning of each safety message is understood by you and others wh
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general safety information Fire or Explosion Hazard Fire Hazard Do not store or use gasoline or other flammable vapors and For continued protection against liquids in the vicinity of this or any other appliance. risk of fire: Avoid all ignition sources if you smell gas. Do not install water heater on carpeted floor. Do not expose water heater controls to excessive gas pressure. Do not operate water heater if flood damaged. Use only the gas shown on the water heater rating label. Maintain require
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general safety information Read and understand this instruction Explosion Hazard manual and the safety messages herein before installing, operating or Overheated water can cause servicing this water heater. water tank explosion. Failure to follow these instructions and Properly sized temperature and safety messages could result in death or serious injury. pressure relief valve must be installed in the opening provided. This manual must remain with the water heater. Water temperature over 125°F (
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introduction Thank You for purchasing this water heater. Properly installed below) in the field involved. installation skills such as plumbing, and maintained, it should give you years of trouble free service. air supply, venting, gas supply and electrical supply are required in addition to electrical testing skills when performing service. aBBreViations used ansi Z223.1 2006 sec. 3.3.83: “qualified Agency” - “Any Abbreviations found in this instruction manual include : individual, firm, corp
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features and components the eliminator (self-cleaning system) electronic ignition control These units include The eliminator (Self-Cleaning System) each heater is equipped with a ignition module. The solid state installed in the front water inlet, See figure 1. The eliminator inlet ignition control (f igure 3), ignites the main burner by utilizing a tube can only be used in the front water inlet connection. Do not silicon nitride igniter. The silicon nitride igniter shuts off during install t
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installation considerations rough in dimensions top top outlet f inlet 1 1/2” npt 1 1/2” npt top View figure 5. front View Back View taBle 1. rough-in-dimensions BCG3 70T120 5NoX BCG3 80T150 6NoX BCG3 100T180 6NoX BCG3 95T199 6NoX BCG3 100T199 6NoX BCG3 100T200 6NoX BCG3 100T250 6NoX BCG3 100T275 6NoX BCG3 85T310 6NoX BCG3 85T366 6NoX BCG3 85T390 6No X model Dim. inches mm inches mm inches mm inches mm inches mm inches mm inches mm inches mm inches mm inches mm inches mm a 63 1800 68 1727 72 18
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installation considerations THe HeATeR muST NoT Be LoCATeD iN AN AReA WHeRe iT locating the water heater WiLL Be SuBJeCT T o fReeZi NG. Lo CATe iT NeAR A f Loo R DRAiN. THe HeATeR SHouLD Be CAUTION LoCATeD iN AN AReA WHeRe LeAKAGe fRom HeATeR oR Co NNeCTio NS WiLL No T ReSuLT iN DAmAGe To ADJACeNT Property Damage Hazard AReA o R To Lo WeR f Loo RS of THe STRuCT uRe. All water heaters eventually leak. • WHeN Su CH Lo CATio NS CANNo T Be AVoi DeD, A Sui TABLe DRAiN PAN SHou LD Be iNSTALLeD u
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insulation Blanket Breathing Hazard - Carbon Monoxide Gas Do not obstruct water heater air intake with insulating blanket. Gas and carbon monoxide detectors are available. Install water heater in accordance with the instruction manual. Breathing carbon monoxide can cause brain damage or death. Always read and understand instruction manual. insulation blankets are available to the general public for external use on gas water heaters but are not necessary with these products. The purpose of an i
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Some circulating pumps are manufactured with sealed bearings and do not require further lubrication. Some circulating pumps must be periodically oiled. Refer to the pump manufacturer’s instructions for lubrication requirements. Breathing Hazard - Carbon Monoxide Gas CIRCULATING PUMP WIRING DIAGRAM CIRCULATING PUMP WIRING DIAGRAM Under no circumstances should DISHWASHER LOOP WITH TOGGLE SWITCH STORAGE TANK OR BUILDING RECIRCULATION the input exceed the rate shown FIELD SUPPLIED TEMPERATURE CON
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installation reQuirements water temperature control and mixing Val Ves gas pressure reQuirements All models require a minimum gas supply pressure of 5.2” Water temperature over 125°F (52°C) W.C. The minimum supply pressure is measured while gas can cause severe burns instantly resulting in severe injury or death. is not flowing (static pressure) AND while gas is flowing (dynamic pressure). The supply pressure (static and dynamic) Children, the elderly and the should never fall below 5.2” W.C.
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dishwashing machines A properly sized thermal expansion tank must be installed on all closed systems to control the harmful effects of thermal All dishwashing machines meeting the National Sanitation expansion. Contact a local plumbing service agency to have a foundation requirements are designed to operate with water thermal expansion tank installed. flow pressures between 15 and 25 pounds per square inch See Water Line Connections on page 19 and the Water Piping (103 kPa and 173 kPa). f
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No valve or other obstruction is to be placed between the regarding the Temperature-Pressure Relief Valve call the toll Temperature-Pressure Relief Valve and the tank. Do not connect free number listed on the back cover of this manual for technical discharge piping directly to the drain unless a 6” (15.2 cm) assistance. air gap is provided. To prevent bodily injury, hazard to life, or contaminated air property damage, the relief valve must be allowed to discharge water in adequate quantities
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Never obstruct the flow of ventilation air. if you have any doubts openings must be installed to provide fresh air for combustion, or questions at all, call your gas supplier. failure to provide the ventilation and dilution in confined spaces. The required size for proper amount of combustion air can result in a fire or explosion the openings is dependent on the method used to provide fresh and cause property damage, serious bodily injury or death. air to the confined space AND the total Btu/
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multiple heater manifold outdoor air through one opening figure 13 and tables on pages 17 and 18 should be used for horizontally manifolding two or more heaters. figure 15. Alternatively a single permanent opening, commencing within 12 figure 13. inches (300 mm) of the top of the enclosure, shall be provided. See figure 14. The water heater shall have clearances of at least 1 inch (25 mm) from the sides and back and 6 inches (l50 fresh air openings for confined spaces mm) from the front of
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When ducts are used, they shall be of the same cross sectional outdoor air through two Vertical ducts area as the free area of the openings to which they connect. The illustrations shown in this section of the manual are a The minimum dimension of rectangular air ducts shall be not less reference for the openings that provide fresh air into confined than 3 inches. spaces only. air from other indoor spaces do not refer to these illustrations for the purpose of vent installation. See Venting
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taBle 7. technical data Venting type B gas Vent multiple gas fired t ank-t ype heaters When venting multiple tank type heaters using Type B vent pipe, follow the installation diagram (figure 13) and tables below which give sizing and data based upon NfPA 54/ANSi Z223. 1992. model Bcg370t1205nox input: 120,000 Btu/hr t otal Vent height (feet) Vent connector size: 5 inches 6 8 10 15
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taBle 8. technical data Venting (continued) model (a)Bcg3100t2506nox input: 250,000 Btu/hr t otal Vent height (feet) Vent connector size: 6 inches 6 8 10 15 20 30 50 100 input Btuh/hrr ise Vent connector diameter (inches) 250,000 1 Ft 8 8 7 7 7 6 6 6 250,000 2 Ft 7 7 7 7 6 6 6 6 250,000 3 Ft 7 7 7 7 6 6 6 6 number combined input of heaters in thousands of Btu/hr manifold and common Vent diameter (inches) 2 500,000 9 9 9 8 8 7 7 7 3 750,000 12 12 1
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water heater installation water line connections t&p Val Ve discharge pipe This manual provides detailed installation diagrams (see pages 34-48 of this manual) for typical methods of application for the water heater(s). Explosion Hazard The water heater may be installed by itself, or with a separate Temperature-Pressure Relief Valve storage tank, on both single and two-temperature systems. When must comply with ANSI Z21.22- used with a separate storage tank, the circulation may be either C
