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Hersteller: Lennox International Inc. Dateigröße: 2.2 mb Dateiname: Unterrichtssprache:

Proper application, termination, construction and location of vents must conform to local codes having jurisdiction. In the absence d local codes, the NFGC serves as the defining doc ument. Refer to the tables and the venting information contained in these instructions to properly size and install the venting system. klMPORTANT kWARNING VENT CONNECTION VENT PIPE FURNACE FLUE TRANSITIOF COLLAR FIGURE 16 Use self-drilling sheet metal screws or a mechanical fastener to firmly secure the vent pipe to the round collar of the flue transition. If self-drilling screws are used to attach the vent pipe, it is recommended that three be used. Drive one self-drilling screw through the front and one through each side of the vent pipe and collar. See figure 16. Install the first vent connector elbow at a minimum of six inches (152 mm) from the furnace vent outlet. Venting Using a Masonry Chimney The following additional requirements apply when a lined masonry chimney is used to vent this furnace. Masonry chimneys used to vent Category I central fur naces must be either tile-lined or lined with a listed metal lining system or dedicated gas vent. Unlined masonry chimneys are prohibited. See figures 17 and 18 for common venting. A chimney with one or more sides exposed to the outside of the structure is considered to be an exterior chimney. An exterior masonry chimney that is not tile-lined must be lined with B1 vent or a listed insulated flexible metal vent. An exterior tileqined chimney that is sealed and capped may be lined with a listed uninsulated flexible metal vent. If the existing chimney will not accommodate a B1 vent or an insulated flexible vent pipe liner, either the chimney must be rebuilt to accommodate one of these liners or an alternate approved venting method must be found. Insulation for the flexible vent pipe must be an encapsulated fiberglass sleeve recommended by the flexible vent pipe manufacturer. See figure 17. G50UH units installed in upflow applications may be vented into a tile-lined masonry chimney without using a listed metal liner, provided that the optional masonry chimney vent adapter kit (18M79) is used. Instructions provided with the kit must be followed exactly. DO NOT insulate the space between the liner and the chimney wall with puffed mica or any other loose granular insulating material CommonVenting Using Metal-Lined Masonry Chimney SEALED / T MAX. LENGTH -SEE NOTE 1 BELOW.II II EXTERIORCHIMNEY WITH II METAL VE%OO.o%OTOR " II '1 LINER __ .,J PERMANENTLY SEALED FIREPLACE OPENING NOTE 1 -Refer to the provided venting tables for installations in the USA and the venting tables in CSA B149 for installations Canada. NOTE 2 -Either single-walled or double-walled vent connector may be used. Refer to the capacity requirements shown in the provided venting tables for installations in USA and the venting tames in current CSA B149 for installations in Canada. FIGURE 17 Page 13 Common Venting Using Tile-Lined Interior Masonry Chimne ' and Combined Vent Connector J MINIMUM LENGTH = AS SHORT AS PRACTICAL. INTERIOR TILE=LINED FOR MAXIMUM LENGTH SEE NOTE TO LEFT MASONRY CHIMNEY NOTE-Refer to provided for installations in the venting tables USA and the J venting tables in current CSA B149 for NOTE -the chimney must be properly installations in Canada. _ sized lined per provided venting with listed metal lining tables or system. m FU OTHER PERMANENTLY APPLIANCE SEALED FIREPLACE OPENING _Row NOTE -Either single-walled or double-walled vent connector may be used. Refer to the capacity requirements as shown in the provided venting tables for installations in USA and the venting tables in current CSA B149 for installations in Canada. FIGURE 18 ,IMPORTANT A fan-assisted furnace may be commonly vented into an existing lined masonry chimney if the following conditions are met: • The chimney is currently serving at least one drafthood equipped appliance • The vent connectors and chimney are sized according to the provided venting tables for the USA, and the appropriate venting tables in the standards of CSA B149 Natural Gas and Propane Installation Codes in Canada. If type B1 double-wall vent is used inside a chimney, no other appliance can be vented into the chimney. The outer wall of type B1 vent pipe must not be exposed to flue products. A type B1 vent or masonry chimney liner shall terminate above the roof surface with a listed cap or a listed roof assembly according to the terms of their respective listings and the vent manufacturer's instructions. When inspection reveals that an existing chimney is not safe for the intended purpose, it shall be rebuilt to conform to nationally recognized standards, lined or relined with suitable materials, or replaced with a gas vent or chimney suitable for venting G50UH(X) series units. The chimney passageway must be checked periodically to ensure that it is clear and free of obstructions. Do not install a manual damper, barometric draft regulator, or flue restrictor betwe...

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