Natco VW Installation And Operating Instructions Manual
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Contents
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12 inches of the ceiling, and the other within 12inches of the floor. Each opening shouldhave a minimum free area of one square inch per4,000 BTUH input of the total input rating of allappliances in the enclosed area. See Table II forrecommended air supply for each model. Animproperly ventilated equipment room can getexcessively hot and cause accelerateddeterioration of controls and electricalcomponents.IMPORTANT: In beauty shops, barber shops,cleaning establishments and self-service laundrieswith dry cleaning equipment, it is important that thewater heater be installed in a location wherecombustion and ventilation air is received from asource outside the building. Please refer to the mostrecent edition of the National Fuel Gas Code, ANSI* When the ceiling height exceeds 8 feet, you are only allowed to consider 8feet when calculating the total volume of the enclosure.Z223.1, or in Canada, CGA requirements.3. Exhaust Fans or Vents: Any equipment whichexhausts air from the heater room can depletethe combustion air supply or reverse the naturaldraft action of the venting system. This couldcause flue products to accumulate in the heaterroom. Additional air must be supplied tocompensate for such exhaust. The information inTable II is not applicable in installations whereexhaust fans or blowers of any type are used.Such installations must be designed byqualified engineers.4. If a blower or fan is used to supply air to theheater room, the installer should make sure itdoes not create drafts which could causenuisance shutdowns of the pilot. If a blower isnecessary to provide adequate combustion air tothe heater, a suitable switch or equivalent mustbe wired into the heater control circuit to preventthe heater from firing unless the blower isoperating.5. The heater must be completely isolated andprotected from any source of corrosive chemicalfumes such as trichlorethylene, perchlorethylene,chlorine, etc.Table II. Minimum RecommendedAir Supply to HeaterHeater Each Opening*Model (Square Inches)500 125600 150715 179850 2131010 2531200 3001430 3581670 4181825 457*Net Free Area in Square InchesArea indicated is for one of two openings; one atfloor level and one at the ceiling, so the total net freearea could be double the figures indicated. Forspecial conditions refer to the latest edition of ANSIZ223.1 or, in Canada, CAN1-B149.1 and .2.Consult factory if not communicating directly throughthe walls with the outdoors.Note: Check with louver manufacturers for net freearea of louvers. Correct for screen resistance to thenet free area if a screen is installed. Check all localcodes applicable to combustion air.2B-2. Venting1. Natco heaters have built-in draft diverters fornatural draft operation and must not beconnected to any portion of a mechanicaldraft system under positive pressure. The flueoutlet must be connected to a clear, unobstructedvent of adequate capacity ending above the6123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890WaterHeater12345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890CLOSET INSTALLATION(UNACCEPTABLE)A closet is any 4 sided enclosurewhich is less than 16* times the totalvolume of all the gas fired applianceswithin the enclosure.ROOM INSTALLATION(ACCEPTABLE)A room is any enclosure which is atleast 16* times greater than the totalvolume of all the gas fired applianceswithin the enclosure.123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890WaterHeaterFigure 6 – Alcove InstallationALCOVE INSTALLATION(ACCEPTABLE)An alcove suitable for the installationof a water heater is a restricted sectionof a room not separated from theroom by a door or partition and whichmeets the minimum clearances forthe specific model water heater listedbelow. |
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This manual is suitable for:
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