Carrier 58MSA Installation, Start-up, And Operating Instructions Manual

Also see for 58MSA Series: Service and maintenance instructions User manual Instruction manual Installation, start-up, and operating instructions Installation, start-up, and operating instructions

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Carrier 58MSA Installation, Start-up, And Operating Instructions Manual Manual pdf 13 page image

Step 2—Furnace Location Relative to CoolingEquipmentThe cooling coil must be installed parallel with or on downstreamside of furnace to avoid condensation in heat exchanger. Wheninstalled parallel with a furnace, dampers or other means used tocontrol flow of air must prevent chilled air from entering furnace.If dampers are manually operated, they must be equipped with ameans to prevent operation of either unit unless damper is infull-heat or full-cool position.Step 3—Hazardous LocationsAIR FOR COMBUSTION AND VENTILATIONStep 1—GeneralProvisions 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 Section 7 of theNSCNGPIC 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.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 pulling air from theburner area and draft safeguard opening into the circulating air.The operation of exhaust fans, kitchen ventilation fans,clothes dryers, fireplaces, or other appliances including atticand crawlspace exhaust fans could create a negative airpressure condition at the furnace. Make-up air must beprovided for these devices, in addition to that required by thefurnace.The requirements for combustion and ventilation air depend uponwhether the furnace is located in a CONFINED or UNCONFINEDspace.Step 2—Unconfined SpaceAn unconfined space must have at least 50 cu ft for each 1000Btuh of total input for all the appliances (such as furnaces, clothesdryers, water heaters, etc.) in the space.If 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 as defined below. Return air must not be taken from theroom unless an equal or greater amount of air is supplied to theroom.Step 3—Confined SpaceA confined space has a volume of less than 50 cu ft per 1000 Btuhof the total input rating for all appliances installed in that space. Aconfined space MUST have 2 permanent openings, 1 within 12 in.of the ceiling, and the other within 12 in. of the floor which freelycommunicate with an unconfined space or the outdoors. (See Fig.12 or 13.)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 fromoutside of the structure or an unconfined space inside the structure.ALL AIR FROM INSIDE THE STRUCTURE1. 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. 12.) The minimum dimension of air openings shall not beless than 3 in.2. If the building is constructed unusually tight, in addition to the2 permanent openings that freely communicate with anunconfined space, a permanent opening directly communicat-ing with the outdoors should be provided. This opening shallhave a minimum free area of 1 sq in. per 4000 Btuh of totalinput rating for all equipment in the enclosure.When furnace is installed in a residential garage, it must beinstalled so that burners and ignition sources are located aminimum of 18 in. above floor. The furnace must be locatedor protected to avoid physical damage by vehicles. Whenfurnace is installed in a public garage, airplane hangar, orother building having a hazardous atmosphere, unit must beinstalled in accordance with requirements of National FireProtection Association, Inc.A9304418-IN. MINIMUMTO BURNERSFor Example:MINIMUM FLOOR AREA FOR UNCONFINED SPACE58MSA FurnaceInput BtuhMinimum Sq Ft With7-1/2 Ft Ceiling40,000 26760,000 40080,000 533100,000 667120,000 80013