Carrier 58GFA Installation, Starting-up And Operation Manual

Also see for INDUCED COMBUSTION FURNACES 58GFA: Installation, start-up, and operating instructions Service and maintenance instructions Service and maintenance instructions Installation, start-up, and operating instructions User's information manual

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Carrier 58GFA Installation, Starting-up And Operation Manual Manual pdf 3 page image

Do not use this furnace during construction when adhesives,sealers, and/or new carpets are being installed. If the furnaceis required during construction, use clean outside air forcombustion and ventilation. Compounds of chlorine andfluorine when burned with combustion air form acids whichwill cause corrosion of the heat exchangers and metal ventsystem. Some of these compounds are found in paneling anddry wall adhesives, paints, thinners, masonry cleaning mate-rials, and many other solvents commonly used in the con-struction process.Excessive exposure to contaminated combustion air willresult in safety and performance related problems.This furnace must be installed so the electrical components areprotected from water. Locate the furnace close to the chimney/ventand as near the center of the air distribution system as possible.The furnace should be installed level.When a furnace is installed so that the supply ducts carry air toareas outside the space containing the furnace, the return air mustalso be handled by a duct(s) sealed to the furnace casing andterminating outside the space containing the furnace.Provide ample space for servicing and cleaning. Always complywith the minimum fire protection clearances shown on the unitrating plate. This furnace shall not be installed directly oncarpeting, tile, or any combustible material other than woodflooring.LOCATION RELATIVE TO COOLING EQUIPMENT — Thecooling coil must be installed parallel with or on the downstreamside of the furnace to avoid condensation in the heat exchangers.When installed parallel with a furnace, dampers or other meansused to control the flow of air must prevent chilled air fromentering the unit. If the dampers are manually operated, they mustbe equipped with means to prevent operation of either unit unlessthe damper is in the full-heat or full-cool position.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, Air for Combustion andVentilation, of the NFGC or applicable provisions of the localbuilding codes.Canadian installations must be in accordance with NSCNGPIC.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.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 prevent air from being pulledfrom the burner area and draft safeguard opening.The operation of exhaust fans, kitchen ventilation fans,clothes dryers, or fireplaces could create a NEGATIVEPRESSURE condition at the furnace. Makeup air MUST beprovided for the ventilation devices, in addition to thatrequired by the furnace.Combustion air requirements are determined by whether thefurnace is 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.For Example:58GFA FURNACEINPUT BTUHMINIMUM SQ FTWITH7-1/2 FT CEILING63,000 42084,000 560105,000 700126,000 840147,000 980If the unconfined space is of unusually tight construction, 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 not less than 1 sq in. per5000 Btuh 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 is one whose volume isless than 50 cu ft per 1000 Btuh of the total output rating for allappliances installed in that space. A confined space MUST have 2permanent openings, 1 within 12 in. of the ceiling, and the otherwithin 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, it may beassumed that wood louvers have a 20 percent free area and metallouvers or grilles have a 60 percent free area. Screens, when used,must not be smaller than 1/4-in. mesh. Louvers and grilles must beconstructed so they cannot be closed.The size of the openings depends upon whether the air comes frominside or outside of the structure.1. All air from inside the structure: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. (SeeFig. 2.)For Example:58GFA FURNACEINPUT BTUHFREE AREA PEROPENING (SQ IN.)63,000 10084,000 100105,000 105126,000 126147,000 147If the building is constructed unusually tight, a permanent openingdirectly communicating with the outdoors should be provided.This opening shall have a minimum free area of 1 sq in. per 5000Btuh of total input rating for all equipment in the enclosure.3