Carrier WeatherMaker 8000 Installation, Start-up, And Operating Instructions Manual

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Carrier WeatherMaker 8000 Installation, Start-up, And Operating Instructions Manual Manual pdf 4 page image

HAZARDOUS LOCATIONS — When the furnace is installed ina residential garage, it must be installed so that the burners andignition source are located at least 18 in. above the floor. Thefurnace should be protected from physical damage by vehicles.When a furnace is installed in public garages, airplane hangars, orother buildings having hazardous atmospheres, the unit must beinstalled in accordance with the recommended good practicerequirements of the National Fire Protection Association, Inc.Step 2—Air For Combustion and VentilationProvisions for adequate combustion and ventilation air must beprovided in accordance with Section 5.3 of the NFGC, Air forCombustion and Ventilation, or applicable provisions of the localbuilding codes.Canadian installations must be installed in accordance with NSC-NGPIC and all authorities having jurisdiction.Air for combustion must not be contaminated by halogencompounds, which include fluoride, chloride, bromide, andiodide. These elements are found in aerosol sprays, deter-gents, bleaches, cleaning solvents, salts, air fresheners, andother household products.The operation of exhaust fans, kitchen ventilation fans,clothes dryers, or fireplaces could create a NEGATIVEPRESSURE CONDITION at the furnace. Make-up air MUSTbe provided for the ventilation devices, in addition to thatrequired by the furnace.All fuel-burning equipment must be supplied with air for combus-tion of the fuel. Sufficient air MUST be provided to ensure therewill not be a negative pressure in the equipment room or space. Inaddition, a positive seal MUST be made between the furnacecabinet and the return-air duct to avoid pulling air from the burnerarea and draft safeguard opening.The requirements for combustion and ventilation air depend uponwhether the furnace is located in an unconfined or confined space.UNCONFINED SPACE — An unconfined space must have atleast 50 cu ft for each 1000 Btuh of input for all the appliances(such as furnaces, clothes dryer, water heaters, etc.) in the space.If the unconfined space is constructed unusually tight, air forcombustion and ventilation MUST come from either the outdoorsor spaces freely communicating with the outdoors. Combustionand ventilation openings must be sized the same as for a confinedspace. A minimum opening with a total of at least 1 sq in. per 5000Btuh of total input rating for all equipment must be provided.Return air must not be taken from the room unless an equal orgreater amount of air is supplied to the room.CONFINED SPACE — A confined space has volume less than 50cu ft per 1000 Btuh of the total input ratings of all appliancesinstalled in that space. A confined space MUST have 2 permanentopenings, 1 within 12 in. of the ceiling, and the other within 12 in.of the floor. (See Fig. 2.)NOTE: In determining the free area of an opening, the blockingeffect of the louvers, grilles, and screens must be considered. If thefree area of a louver or grille design is unknown, assume that woodlouvers have a 20 percent free area and metal louvers or grilleshave a 60 percent free area. Screens, when used, must not besmaller than 1/4-in. mesh. Louvers and grilles must be constructedso they cannot be closed.The size of the openings depends upon whether the air comes frominside or outside the structure.1. All air from inside the structure:a. Each opening MUST have at least 1 sq in. of free area per1000 Btuh of the total input for all equipment within theconfined space, but not less than 100 sq in. per opening.(See Fig. 2.)b. If the building is constructed unusually tight, in addition tothe 2 permanent openings that freely communicate with anunconfined space, a permanent opening directly communi-cating with the outdoors should be provided. This openingshould have a minimum free area of 1 sq in. per 5000 Btuhof total input rating for all equipment in the enclosure.For Example:58ZAV FURNACEINPUT BTUHMINIMUM SQ FTWITH7-1/2 FT CEILING46,000 30769,000 46092,000 613115,000 767135,000 920Fig. 2—Air for Combustion and Ventilation(Inside Air)A93387RETURNAIR6″ MIN(FRONT) †SUPPLY AIRVENT THROUGH ROOF(CATEGORY I)1 SQ IN.PER 1000BTUH* IN DOOROR WALL12″ MAX1 SQ IN.PER 1000BTUH* IN DOOROR WALL12″ MAXINTERIORHEATEDSPACE* Minimum opening size is 100 square in. withminimum dimensions of 3-In.† Minimum of 3-In. when type B-1 vent is used.UNCONFINEDSPACEFor Example:58ZAV FURNACE IN-PUT BTUHFREE AREA PEROPENING (SQ IN.)46,000 10069,000 10092,000 100115,000 115135,000 1384