York TL8E Installation Manual

York TL8E Installation Manual Manual pdf 4 page image

5532522-UIM-B-06194 Johnson Controls Ducted SystemsSECTION II: DUCTWORKDUCTWORK GENERAL INFORMATIONThe duct system’s design and installation must:1. Handle an air volume appropriate for the served space and withinthe operating parameters of the furnace specifications.2. Be installed in accordance of National Fire Protection Associationas outlined in NFPA standard 90B (latest editions) or applicablenational, provincial, state, and local fire and safety codes.3. Create a closed duct system. When a furnace is installed so thatthe supply ducts carry air circulated by the furnace to areas outsidethe space containing the furnace, the return air shall also be han-dled by a duct(s) sealed to the furnace casing and terminating out-side the space containing the furnace.4. Complete a path for heated or cooled air to circulate through the airconditioning and heating equipment and to and from the condi-tioned space.When the furnace is used with a cooling coil, the coil must be installedparallel with, or in the supply air side of the furnace to avoid condensa-tion in the primary heat exchanger. When a parallel flow arrangement isused, dampers or other means used to control airflow must be ade-quate to prevent chilled air from entering the furnace. If manually oper-ated, the damper must be equipped with means to prevent the furnaceor the air conditioner from operating unless the damper is in full heat orcool position.When replacing an existing furnace, if the existing plenum is not thesame size as the new furnace then the existing plenum must beremoved and a new plenum installed that is the proper size for the newfurnace. If the plenum is shorter than 12” (30.5 cm) the turbulent air flowmay cause the limit controls not to operate as designed, or the limit con-trols may not operate at all.The duct system is a very important part of the installation. If the ductsystem is improperly sized the furnace will not operate properly.The ducts attached to the furnace plenum, should be of sufficient sizeso that the furnace operates at the specified external static pressureand within the air temperature rise specified on the nameplate.If a matching cased indoor coil is used, it may be placed directly on thefurnace outlet and sealed to prevent leakage. If an uncased indoor coilwith a thermoplastic drain pan is to be installed in the upflow/horizontalconfiguration, then extra 2” minimum spacing may be needed to ensureagainst drain pan distortion.On all installations without a coil, a removable access panel is recom-mended in the outlet duct such that smoke or reflected light would beobservable inside the casing to indicate the presence of leaks in theheat exchanger. This access cover shall be attached in such a manneras to prevent leaks.DUCT FLANGESFour flanges are provided to attach ductwork to the furnace. Theseflanges are rotated down for shipment. In order to use the flanges,remove the screw holding an individual flange, rotate the flange so it isin the upward position and reinstall the screw then repeat this for all 4flanges.If the flanges are not used, they must remain in the rotated down posi-tion as shipped.DUCTWORK INSTALLATION AND SUPPLY PLENUMCONNECTIONAttach the supply plenum to the furnace outlet. The use ofan approved flexible duct connector is recommended on allinstallations. This connection should be sealed to preventair leakage. The sheet metal should be crosshatched toeliminate any popping of the sheet metal when the indoorfan is energized.COIL INSTALLATIONThe indoor coil must be mounted on the supply side of the furnace asshown in Figure 2. Refer to the Installation Instructions provided witheach indoor coil.CAUTIONThe cooling coil must be installed in the supply air duct, downstreamof the furnace. Cooled air may not be passed over the heatexchanger.IMPORTANT: The minimum plenum height is 12” (30.5 cm). The fur-nace will not operate properly on a shorter plenum height. The mini-mum recommended rectangular duct height is 4” (10.1 cm) attachedto the plenum.WARNINGThe duct system must be properly sized to obtain the correct airflowfor the furnace size that is being installed.Refer to Table 4 or the furnace rating plate for the correct rise rangeand static pressures.If the ducts are undersized, the result will be high duct static pres-sures and/or high temperature rises which can result in a heatexchanger OVERHEATING CONDITION. This condition can result inpremature heat exchanger failure, which can result in personal injury,property damage, or death.!!FIGURE 1: Duct AttachmentIMPORTANT: On all installations without an indoor coil, a removableaccess panel is recommended in the outlet duct such that smoke orreflected light would be observable inside the casing to indicate thepresence of leaks in the heat exchanger. This access cover shall beattached in such a manner as to prevent leaks.)DFWRU\LQVWDOOHG)RUGXFWDWWDFKPHQWLIQHHGHG$