Carrier 58CMA Installation And Operating Instructions Manual

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Carrier 58CMA Installation And Operating Instructions Manual Manual pdf 4 page image

Do not block combustion-air openings in the furnace. Anyblockage will result in improper combustion which may resultin a fire hazard and/or cause bodily harm.Step 2—GeneralThis furnace should be installed in a location in which facilities forventilation permit satisfactory combustion of oil, proper venting,and maintenance of ambient temperature at safe limits undernormal conditions of use. The location should not interfere withproper circulation of air within the confined space. (See NFPA-31,Section 1.5.)In addition to air needed for combustion, process air shall beprovided as required for: cooling of equipment or material,controlling dew point, heating, drying, oxidation or dilution, safetyexhaust, and odor control.In addition to air needed for combustion, air shall be supplied forventilation, including all air required for comfort and properworking conditions for personnel.The barometric draft regulator (included with furnace) shall beinstalled in same room or enclosure as furnace in such a manner asto prevent any difference in pressure between regulator andcombustion-air supply.Air requirements for operation of exhaust fans, kitchen ventilationsystems, clothes dryers, and fireplaces shall be considered indetermining the adequacy of a space to provide combustion-airrequirements.The lack of a proper amount of combustion air can lead to seriousfurnace operational problems. Some of these problems are:1. Excessive oil burner after-drip, and oil fumes.2. Sooting.3. Melted oil burner ignitor/relay control.4. Air band or air turbulator settings more open than normal.5. Lockouts on start-up.The requirements for combustion and ventilation air depend uponwhether furnace is located in a CONFINED or UNCONFINEDspace.Step 3—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.In unconfined spaces in buildings of conventional frame, brick, orstone construction, infiltration MAY be adequate to provide air forcombustion, ventilation, and dilution of flue gases. This determi-nation must be made on an individual installation basis and musttake into consideration the overall volume of unconfined space, thenumber of windows and ventilation openings, the number of doorsto the outside, internal doors which can close off unconfined space,and overall tightness of building construction. Consideration mustalso be given to the amount of storage items (furniture, boxes, etc.)within the unconfined space which take away from the air volume.(See Table 2.)Many new buildings and homes (and older ones that have beenweatherized) MUST BE considered as being of tight construction,therefore, infiltration will not be sufficient to supply necessary airfor combustion and ventilation.A building can be considered as being of tight construction when:• Walls and ceilings exposed to outside atmosphere have acontinuous water vapor retarder with a rating of 1 perm or lesswith openings gasketed or sealed, and/or• Weatherstripping has been added on operable windows anddoors and/or• Caulking or sealants are applied to areas such as joints aroundwindow and door frames, between sole plates and floors,between wall-ceiling joints, between wall panels, at penetra-tions for plumbing, electrical, and fuel lines, and at otheropenings.If combustion and ventilation air must be supplied to an uncon-fined space from outside, an opening with a FREE AREA of notless than 1 sq in. per 1000 Btuh of total input of all applianceswithin unconfined space (but not less than 100 sq in.) must beprovided. This opening must be located such that it can not beblocked at any time.Step 4—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.When furnace is installed in a closet or enclosure, 2 ventilationopenings, with OPEN AREA as dimensioned in example beloware required for combustion air. The openings should be locatedabout 6 in. from top and bottom of enclosure at front of furnace.(See Table 3.)NOTE: In calculating free area, consideration shall be given toblocking effect of louvers, grilles, or screens protecting openings.Screens used shall not be smaller than 1/4-in. mesh and shall bereadily accessible for cleaning. If free area through a louver orgrille is known, it shall be used in calculating size and free areaspecified. If design and free area are not known, it may be assumedthat wood louvers have 20 percent free area and metal louvers andgrilles have 60 percent free area. Louvers shall be fixed in openposition or interlocked with furnace so they open automatically atfurnace start-up and remain open during furnace operation.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 STRUCTUREFor a confined space, where air is taken from an interior space, 2permanent openings of equal area are required. One opening mustbe within 12 in. of ceiling and the other within 12 in. of floor. EachTable 2—Minimum Floor AreaFor Unconfined Space58CMA FURNACEINPUT BTUHMINIMUM SQ FT WITH7-1/2 FT CEILING70,000 46791,000 607105,000 700119,000 793140,000 933154,000 1026Table 3—Combustion AirFrom Confined Space58CMA FURNACEINPUT BTUHLENGTH(IN.)HEIGHT(IN.)70,000-105,000 16 8119,000 20 104