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8The water heater must be located close to a suitable freeflowingfloor drain. Where a floor drain is not adjacent to thewater heater, a suitable drain pan must be installed under thewater heater. See Figure 10 for proper installation. The drainpan should be at least 4” (10.2 cm) larger than the diameter ofthe water heater, and at least 1” (2.5 cm) deep, providingaccess to the drain valve. This pan must not restrict the flow ofventilation and combustion air. This pan must be piped to asuitable drain to prevent damage to property in the event of awater leak from the piping, the temperature and pressure reliefvalve, or the water heater. Failure to follow this warning couldresult in property damage, severe personal injury, or death.All water heaters will leak. The manufacturer, based onnational building codes, has given the necessaryinstructions to prevent damage to the building. Under nocircumstances is the manufacturer to be held liable for anywater damage in connection with this water heater. SeeFigure 10 for proper installation.Figure 1 – Minimum ClearancesThis water heater IS NOT design certified for installation in amanufactured (mobile) home or for installation outdoors.Failure to follow this warning could result in property damage,severe personal injury, or death.This water heater is approved for installation on either acombustible or non-combustible floor. However, should this waterheater be installed directly on carpeting, the carpeting must beprotected by a wood or metal panel beneath the water heater.This panel must extend at least 3” (7.6 cm) beyond the width anddepth of the water heater. Should the water heater be installed inan alcove or closet, the entire floor area must be covered by thepanel. The panel must be strong enough to carry the weight of thewater heater when it is full of water (CG-73 = 1040 lbs., CG-65 =1010 lbs.)Figure 2 – All Air from Inside the BuildingMinimum ClearancesThe minimum clearances from combustible materials for thiswater heater are: 6” (15.2 cm) from the sides and rear, 24” (61cm) from the front, and 18” (45.7 cm) from the top.Combustion and Ventilation Air SupplyIn order for the water heater to operate properly, it must besupplied with an uninterrupted flow of clean combustion andventilation air. The area around the water heater must always bekept clear so that the flow of combustion and ventilation air is notblocked. An inadequate supply of air to the water heater willproduce a bright yellow burner flame, causing sooting in thecombustion chamber, on the burners, and in the flue tubes. Thiscan result in damage to the water heater and serious bodily injuryif not corrected.Combustion and ventilation air requirements are determined bythe water heater location. Water heaters are installed in eitheropen (unconfined) spaces or smaller (confined) spaces, such asclosets or small rooms.Figure 3 – Communicating Directly with the Outdoors
9Requirements for Unconfined SpacesAn unconfined space is an area with at least 50 cubic feet foreach 1,000 BTU/H of the total input rating for all gas-firedappliances installed in that space. Water heaters installed inunconfined spaces do not usually require outdoor air to functionproperly. However, in buildings with tight construction (heavyinsulation, vapor barriers, weather stripping, etc.), andparticularly in modern buildings, additional fresh air may need tobe provided. For instructions on obtaining additional air supply,see the requirements for confined spaces.Requirements for Confined SpacesA confined space is an area where the volume is less than 50cubic feet for each 1,000 BTU/H of the total input rating for allgas appliances installed in that space. Water heaters installed inconfined spaces require additional combustion and ventilationair. This can be provided in two ways:Figure 4 – Communicating with the Outdoors through Vertical Ducts1. All Air from Inside the BuildingThe confined space shall be provided with two permanentopenings communicating directly with one or more rooms ofsufficient volume, so that the combined volume of all spacesmeets the criteria for an unconfined space. The total input ratingof all gas appliances installed in the combined space shall beconsidered in making this determination.Each opening shall have a minimum free area of one square inchper 1,000 BTU/H of the total input rating of all gas appliances inthe confined space, but not less than 100 square inches. Oneopening shall commence within 12” (30.5 cm) of the top and onewithin 12” (30.5 cm) of the bottom of the enclosure. See Figure 2.2. All Air from OutdoorsThe confined space shall be provided with two permanentopenings, one commencing within 12” (30.5 cm) of the top andone commencing within 12” (30.5 cm) of the bottom of theenclosure. The openings shall communicate directly, or by ducts,with the outdoors or spaces (crawl or attic) that freelycommunicate with the outdoors.Figure 5 – Communicating with the Outdoors through Vertical Ductsa. When communicating directly with the outdoors, eachopening shall have a minimum free area of one square inch per 4,000BTU/H of the total input rating of all gas appliances in the enclosure. SeeFigure 3.b. When communicating with the outdoors through vertical ducts, eachopening shall have a minimum free area of one square inch per 4,000BTU/H of the total input rating of all gas appliances in the enclosure. SeeFigure 4.c. When communicating with the outdoors through horizontal ducts, eachopening shall have a minimum free area of 1 square inch per 2,000 BTU/Hof the total input rating of all gas appliances in the enclosure. See Figure5.When ducts are used, they shall be of the same cross-sectional area asthe free area of the openings to which they connect. The minimum shortside dimension of rectangular air ducts shall not be less than 3” (7.62 cm).Louvers and GrillesIn calculating free area for ventilation and combustion air supply openings,consideration must be given to the blocking effect of louvers, grilles, orscreens protecting the openings. Screens must not be smaller than ¼”(6.4 mm) mesh. If the free area through a particular design of louver orgrille is known, it should be used in calculating the size of opening required to provide the free area specified. If the design and free
Page 1 and 2: Commercial Gas-FiredWater HeaterINS
Page 3 and 4: 3The following defined terms are us
Page 5 and 6: 5PART 1 - GENERAL SAFETY INFORMATIO
Page 7: 7PART 2 - INSTALLATION INSTRUCTIONS
Page 11 and 12: 11venting may require the use of a
Page 13 and 14: 13Power VenterVent TerminationKit #
Page 15 and 16: 15All piping and components that ar
Page 19 and 20: 19Installation ChecklistLocation Is
Page 21 and 22: 21CondensationAs moisture from the
Page 23 and 24: Figure 15 - Water Heater Assembly23
Page 32 and 33: MAINTENANCE NOTES32
Page 34 and 35: 34Advanced Heating and Hot Water Sy

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