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

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Carrier 58DLA Installation, Start-up, Operating And Service And Maintenance Instructions Manual pdf 31 page image

31To prevent condensation in the furnace and vent system, thefollowing precautions must be observed:1. The return--air temperature must be at least 60_F (16_C)db except for brief periods of time during warm--up fromsetback at no lower than 55_F (13_C) db or during initialstart--up from a standby condition.2. Adjust the gas input rate per the installation instructions.Low gas input rate causes low vent gas temperatures, caus-ing condensation and corrosion in the furnace and/or vent-ing system. Derating is permitted only for altitudes above2000 ft. (610 M).3. Adjust the air temperature rise to the midpoint of the riserange or slightly above. Low air temperature rise can causelow vent gas temperature and potential for condensationproblems.4. Set the thermostat heat anticipator or cycle rate to reduceshort cycling.Air for combustion must not be contaminated by halogencompounds which include chlorides, fluorides, bromides, andiodides. These compounds are found in many common homeproducts such as detergent, paint, glue, aerosol spray, bleach,cleaning solvent, salt, and air freshener, and can cause corrosionof furnaces and vents. Avoid using such products in thecombustion--air supply. Furnace use during construction of thebuilding could cause the furnace to be exposed to halogencompounds, causing premature failure of the furnace or ventingsystem due to corrosion.Vent dampers on any appliance connected to the common ventcan cause condensation and corrosion in the venting system. Donot use vent dampers on appliances common vented with thisfurnace.Additional Venting RequirementsA 4--in. (102 mm) round vent elbow is supplied with the furnace.A 5--in. (127 mm) or 6--in. (152 mm) vent connector may berequired for some model furnaces. A field--supplied 4--in. to 5--in.(102 to 127 mm) or 4--in. to 6--in. (102 to 152 mm) sheet metalincreaser fitting is required when 5--in. or 6--in. (127 or 152 mm)vent connector is used. See Fig. 34--46 Venting Orientation forapproved vent configurations.NOTE: Vent connector length for connector sizing starts atfurnace vent elbow. The 4--in. (102 mm) vent elbow is shippedfor upflow configuration and may be rotated for other positions.Remove the 3 screws that secure vent elbow to furnace, rotatefurnace vent elbow to position desired, reinstall screws. Thefactory--supplied vent elbow does NOT count as part of thenumber of vent connector elbows.The vent connector can exit the furnace through one of 5locations on the casing.1. Attach the single wall vent connector to the furnace ventelbow, and fasten the vent connector to the vent elbowwith at least two field--supplied, corrosion--resistant, sheetmetal screws located 180_ apart.NOTE: An accessory flue extension is available to extend fromthe furnace elbow to outside the furnace casing. See Table 16 foraccessory listing. If flue extension is used, fasten the flueextension to the vent elbow with at least two field--supplied,corrosion--resistant, sheet metal screws located 180_ apart. Fastenthe vent connector to the flue extension with at least twofield--supplied, corrosion resistant sheet metal screws located180_ apart.2. Vent the furnace with the appropriate connector as shownin Fig. 34--46.3. Determine the correct location of the knockout to be re-moved.4. Use a hammer and screwdriver to strike a sharp blowbetween the tie points and work the slug back and forthuntil the slug breaks free.CUT HAZARDFailure to follow this caution may result in personal injury.Sheet metal parts may have sharp edges or burrs. Use careand wear appropriate protective clothing, safety glasses andgloves when handling parts and servicing furnaces.CAUTION!BURN HAZARDFailure to follow this caution may cause personal injury.Hot vent pipe is within reach of small children wheninstalled in downflow position. See the followinginstruction.CAUTION!An accessory Vent Guard Kit, is REQUIRED for downflowapplications where the vent exits through the lower portion of thefurnace casing. See Fig. 38. Refer to the Vent Guard KitInstructions for complete details. See Table 16 for accessorylisting.The horizontal portion of the venting system shall slope upwardsnot less than 1/4--in. (6 mm) per linear ft. (21 mm/M) from thefurnace to the vent and shall be rigidly supported every 5 ft. (2M) or less with metal hangers or straps to ensure there is nomovement after installation.Sidewall VentingThis furnace is not approved for direct sidewall horizontalventing.Per section 12.4.3 of the NFPA 54/ANSI Z223.1--2009 , anylisted mechanical venter may be used, when approved by theauthority having jurisdiction.Select the listed mechanical venter to match the Btuh input of thefurnace being vented. Follow all manufacturer’s installationrequirements for venting and termination included with the listedmechanical venter.58DL