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

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Carrier 58UHV Installation, Start-up, And Operating Instructions Manual Manual pdf 6 page image

2. Air from outside the structure requires 1 of the followingmethods:a. If combustion air is taken from outdoors through 2 verticalducts, the openings and ducts MUST have at least 1 sq in.of free area per 4000 Btuh of total input for all equipmentwithin the confined space. (See Fig. 4 and Table 2.)b. If combustion air is taken from outdoors through 2 hori-zontal ducts, the openings and ducts MUST have at least 1sq in. of free area per 2000 Btuh of total input for allequipment within the confined space. (See Fig. 4 and Table2.)c. If combustion air is taken from outdoors through a singleopening or duct (horizontal or vertical) commencing within12 in. of the top of the confined space, opening and ductMUST have at least 1 sq in. of free area per 3000 Btuh ofthe total input for all equipment within the confined spaceand not less than the sum of the areas of all vent connectorsin the confined space. (See Fig. 4 and Table 2.) Equipmentclearances to the structure shall be at least 1 in. from thesides and back and 6 in. from the front of the appliances.When ducts are used, they must be of the same cross-sectional areaas the free area of the openings to which they connect. Theminimum dimension of ducts must not be less than 3 in. (See Fig.4.)Step 3—Air DuctsGENERAL REQUIREMENTSThe duct system should be designed and sized according toaccepted national standards such as those published by: AirConditioning Contractors Association (ACCA), Sheet Metal andAir Conditioning Contractors National Association (SMACNA) orAmerican Society of Heating, Refrigerating and Air ConditioningEngineers (ASHRAE) or consult factory The Air Systems DesignGuidelines reference tables available from your local distributor.The duct system should be sized to handle the required systemdesign airflow CFM at the design external static pressure.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.Secure ductwork with proper fasteners for type of ductwork used.Seal supply- and return-duct connections to furnace with codeapproved tape or duct sealer.Flexible connections should be used between ductwork andfurnace to prevent transmission of vibration. Ductwork passingthrough unconditioned space should be insulated to enhancesystem performance. When air conditioning is used, a vaporbarrier is recommended.Maintain a 1-in. clearance from combustible materials to supply airductwork for a distance of 36 in. horizontally from the furnace. SeeNFPA 90B or local code for further requirements.DUCTWORK ACOUSTICAL TREATMENTMetal duct systems that do not have a 90 degree elbow and 10 ftof main duct to the first branch take-off may require internalacoustical lining. As an alternative, fibrous ductwork may be usedif constructed and installed in accordance with the latest edition ofSMACNA construction standard on fibrous glass ducts. Bothacoustical lining and fibrous ductwork shall comply with NFPA90B as tested by UL Standard 181 for Class 1 Rigid air ducts.SUPPLY AIR CONNECTIONS1. Upflow FurnaceConnect supply-air duct to 3/4-in. flange on furnace supply-airopening outlet. The supply-air duct attachment must ONLY beconnected to furnace supply/outlet flanges or air conditioningcoil casing (when used). DO NOT cut main furnace casing toattach supply side air duct, humidifier, or other accessories. Allaccessories MUST be connected external to furnace maincasing.2. Horizontal FurnacesConnect supply-air duct to 3/4-in. flange on supply air openingon furnace. The supply-air duct attachment must ONLY beconnected to furnace supply/outlet or air conditioning coilcasing (when used). DO NOT cut main furnace casing to attachsupply side air duct, humidifier, or other accessories. Allaccessories MUST be connected external to furnace maincasing.RETURN AIR CONNECTIONSNever connect return-air ducts to back of furnace. A failure tofollow this warning can cause a fire, personal injury, or death.1. Upflow FurnacesThe return-air duct must be connected to bottom, sides (left orright), or a combination of bottom and sides(s) of main furnacecasing as shown in Fig. 1. Bypass humidifier may be attachedinto unused side return air portion of the furnace casing. DONOT connect any portion of return-air duct to back of furnacecasing.2. Horizontal FurnacesThe return-air duct must be connected to return-air openingprovided as shown in Fig. 1. DO NOT cut into casing sides orback to attach any portion of return-air duct. Bypass humidifierconnections should be made at ductwork or coil casing sidesexterior to furnace.Table 2—Minimum Free Area Of Combustion Air Opening*58UHV/58UXVFURNACEHIGH-FIREINPUT(BTUH)AIR FROM INDOORUNCONFINED SPACEOUTDOOR AIR THROUGHVERTICAL DUCTSOUTDOOR AIR THROUGHHORIZONTAL DUCTSOUTDOOR AIR THROUGHSINGLE DUCTFree Areaof Opening(Sq In.)Free Area ofOpening and Duct(Sq In.)RoundPipe(In. Dia)Free Area ofOpening and Duct(Sq In.)RoundPipe(In. Dia)Free Area ofOpening and Duct(Sq In.)RoundPipe(In. Dia)60,000 100 15.0 5 30.0 7 20.0 680,000 100 20.0 6 40.0 8 26.7 6100,000 100 25.0 6 50.0 8 33.4 7117,000 117 29.3 7 58.5 9 39.0 8* Free area shall be equal to or greater than the sum of the areas of all vent connectors in the confined space. Opening area must be increased, if other gas appliancesin the space require combustion air.6→→