Carrier 58CTA Installation, Start-up, Operating And Service And Maintenance Instructions

Also see for 58CTA: Product data Installation and service instructions

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Carrier 58CTA Installation, Start-up, Operating And Service And Maintenance Instructions Manual pdf 10 page image

10Table 3 – Minimum Space Volumes for 100% Combustion, Ventilation, and Dilution from IndoorsACHOTHER THAN FAN---ASSISTED TOTAL(1,000s BTUH GAS INPUT RATE)FAN---ASSISTED TOTAL(1,000s BTUH GAS INPUT RATE)30 40 50 44 66 88 110 132 154Space Volume (ft.3)0.60 1,050 1,400 1,750 1,100 1,650 2,200 2,750 3,300 3,8500.50 1,260 1,680 2,100 1,320 1,980 2,640 3,300 3,960 4,6200.40 1,575 2,100 2,625 1,650 2,475 3,300 4,125 4,950 5,7750.30 2,100 2,800 3,500 2,200 3,300 4,400 5,500 6,600 7,7000.20 3,150 4,200 5,250 3,300 4,950 6,600 8,250 9,900 11,5500.10 6,300 8,400 10,500 6,600 9,900 13,200 16,500 19,800 23,1000.00 NP NP NP NP NP NP NP NP NPNP = Not PermittedTable 3--Minimum Space Volumes were determined by usingthe following equations from the National Fuel Gas Code ANSIZ223.1--2012/NFPA 54--2012, 9.3.2.2:1. For other than fan--assisted appliances, such as a drafthood--equipped water heater:Volume Other = 21ft 3ACHI other1000 Btu/hrA040022. For fan--assisted appliances such as this furnace:Volume Fan = 15ft 3ACHI fan1000 Btu/hrA04003If:Iother = combined input of all other than fan--assistedappliances in Btuh/hrIfan = combined input of all fan--assisted appliances inBtuh/hrACH = air changes per hour (ACH shall not exceed 0.60.)The following requirements apply to the Standard Method andto the Known Air Infiltration Rate Method.1. Adjoining rooms can be considered part of a space if:a. There are no closeable doors between rooms.b. Combining spaces on same floor level. Each openingshall have free area of at least 1 in.2/1,000 Btuh (2,000mm 2/kW) of the total input rating of all gas appliancesin the space, but not less than 100 in.2 (0.06 m 2). Oneopening shall commence within 12 in. (300 mm) of theceiling and the second opening shall commence within12 in. (300 mm) of the floor. The minimum dimensionof air openings shall be at least 3 in. (80 mm). (See Fig.8.)c. Combining space on different floor levels. The volumesof spaces on different floor levels shall be considered ascommunicating spaces if connected by one or more per-manent openings in doors or floors having free area ofat least 2 in.2/1,000 Btuh (4,400 mm 2 /kW) of total inputrating of all gas appliances.2. An attic or crawlspace may be considered a space thatfreely communicates with the outdoors provided there areadequate permanent ventilation openings directly to out-doors having free area of at least 1--in.2/4,000 Btuh oftotal input rating for all gas appliances in the space.3. In spaces that use the Indoor Combustion Air Method, in-filtration should be adequate to provide air for combus-tion, permanent ventilation and dilution of flue gases.However, in buildings with unusually tight construction,additional air MUST be provided using the methods de-scribed in the Outdoor Combustion Air Method section.Unusually tight construction is defined as Constructionwith:a. Walls and ceilings exposed to the outdoors have a con-tinuous, sealed vapor barrier. Openings are gasketed orsealed andb. Doors and openable windows are weatherstripped andc. Other openings are caulked or sealed. These includejoints around window and door frames, between soleplates and floors, between wall--ceiling joints, betweenwall panels, at penetrations for plumbing, electrical andgas lines, etc.Combination of Indoor and Outdoor Air1. Indoor openings shall comply with the Indoor Combus-tion Air Method below and,2. Outdoor openings shall be located as required in the Out-door Combustion Air Method mentioned previously and,3. Outdoor openings shall be sized as follows:a. Calculate the Ratio of all Indoor Space volume dividedby required volume for Indoor Combustion Air Meth-od below.b. Outdoor opening size reduction Factor is 1 minus theRatio in a. above.c. Minimum size of Outdoor openings shall be the size re-quired in Outdoor Combustion Air Method above mul-tiplied by reduction Factor in b. above. The minimumdimension of air openings shall be not less than 3 in. (80mm).INSTALLATIONUPFLOW INSTALLATIONBottom Return Air InletThese furnaces are shipped with bottom closure panel installed inbottom return--air opening. Remove and discard this panel whenbottom return air is used. To remove bottom closure panel,perform the following:1. Tilt or raise furnace and remove 2 screws holding bottomfiller panel. (See Fig. 9.)2. Rotate bottom filler panel downward to release holdingtabs.3. Remove bottom closure panel.4. Reinstall bottom filler panel and screws.Side Return Air InletThese furnaces are shipped with bottom closure panel installed inbottom return--air opening. This panel MUST be in place whenonly side return air is used.58CT