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1 352'8&7 /,7(5$785( /HQQR[,QGXVWULHV,QF 'DOODV 7H[DV,167$//$7,21,16758&7,216 * 6(5,(6 81,76 GAS UNITS 503,543M 9/96 Supersedes 503,222M /LWKR 86$ 7$%/( 2) &217(176 UNIT DIMENSIONS... 2 PARTS ARRANGEMENT... 3 REQUIREMENTS... 4 GENERAL... 5 COMBUSTION, DILUTION AND VENTILATION AIR... 5 INSTALLATION--Setting Equipment... 7 RETURN AIR OPENING GUIDELINES... 7 FILTER ASSEMBLY AND FILTERS... 8 DUCT SYSTEM... 8 VENTING... 8 GAS PIPING ELECTRICAL UNIT START--UP HIGH ALTITUDE INFORMATION GAS PRESSURE ADJUSTMENT OTHER UNIT ADJUSTMENTS SERVICE REPAIR PARTS START--UP AND PERFORMANCE CHECK LIST BCC2 TROUBLESHOOTING (7$,1 7(6(,16758&7,216 )25 )8785( 5()(5(1&( :$51,1*,I WKH LQIRUPDWLRQ LQ WKLV PDQXDO LV QRW IROORZHG H[DFWO\ D ILUH RU H[SORVLRQ PD\ UHVXOW FDXVLQJ SURSHUW\ GDPDJH SHUVRQDO LQMXU\ RU ORVV RI OLIH 'R QRW VWRUH RU XVH JDVROLQH RU RWKHU IODPPDEOH YDSRUV DQG OLTXLGV LQ WKH YLFLQLW\ RI WKLV RU DQ\ RWKHU DSSOLDQFH,QVWDOODWLRQ DQG VHUYLFH PXVW EH SHUIRUPHG E\ D TXDOLILHG LQVWDOOHU VHUYLFH DJHQF\ RU WKH JDV VXSSOLHU :$7 72 '2,) <28 60(// *$6 - 'R QRW WU\ WR OLJKW DQ\ DSSOLDQFH - ([WLQJXLVK DQ\ RSHQ IODPHV - 'R QRW WRXFK DQ\ HOHFWULFDO VZLWFK GR QRW XVH DQ\ SKRQH LQ \RXU EXLOGLQJ -,PPHGLDWHO\ FDOO \RXU JDV VXSSOLHU IURP D QHLJKERU V SKRQH )ROORZ WKH JDV VXSSOLHU V LQVWUXFWLRQV -,I \RX FDQQRW UHDFK \RXU JDV VXSSOLHU FDOO WKH ILUH GHSDUWPHQW

2 G20 UNIT DIMENSIONS--INCHES (MM) 1-1/16 (27) C 17-3/4 (451) SUPPLY AIR OPENING FLUE OUTLET (center side to side) G 1-1/16 (27) 28-3/8 (721) 26-1/8 (664) H 2-1/4 (57) B WHISPER HEAT GAS PIPING INLET (Both Sides) 17-1/2 (445) (Left) 20-1/2 (521) (Right) D 2-5/8 (67) (Right) 2-3/8 (60) (Left) ELECTRICAL INLETS (Both Sides) 22 (559) 2-1/16 RETURN AIR (52) OPENING (Either Side or Bottom) A AIR FLOW RETURN AIR FILTER (Either Side or *Bottom) 1-1/2 (38) 22 (559) Return Air E 1-11/16 Return Air (43) *OPTIONAL BOTTOM RETURN AIR FILTER KIT REQUIRED F Model No. A B C D E F G H G20Q2E(X)-50 G20Q3E(X)-50 G20Q2E(X)-75 G20Q3E(X) (45) 16-1/4 (413) 14-1/8 (359) 14 (356) 11 (279) 2-5/8 (67) 8-1/8 (206) 3-1/8 (79) G20Q4E(X)-75 G20Q3/4E(X) (45) 21-1/4 (540) 19-1/8 (486) 14 (356) 14 (356) 3-5/8 (92) 10-5/8 (270) 3-1/8 (79) G20Q5/6E(X)-100 G20Q3/4E(X)-5 G20Q5/6E(X)-5 53 (1346) 26-1/4 (667) 24-1/8 (613) 18 (457) 21 (533) 2-5/8 (67) 13-1/8 (333) 3-3/8 (86) G20Q5/6E(X) (1346) 31-1/4 (794) 29-1/8 (740) 18 (457) 26 (660) 2-5/8 (67) 15-5/8 (397) 3-3/8 (86)

3 G20 PARTS ARRANGEMENT CABINET CAP TOP STRIP DRAFT HOOD PARTS IDENTIFICATION (G20 Units Shown) REAR BAFFLE UPPER ACCESS PANEL BLOCKED VENT SHUT--OFF SWITCH HEAT EXCHANGER IGNITION CONTROL CABINET GAS MANIFOLD LIMIT CONTROL ROLL--OUT SWITCH GAS VALVE PILOT/ELECTRODE ASSEMBLY BURNERS REMOVABLE BURNER BOX TOP BURNER BOX BLOWER CONTROL BOX BURNER BOX DAMPER ASSEMBLY FIGURE 1 DAMPER BOX PARTS ARRANGEMENT ROLL--OUT SWITCH REMOVABLE BURNER BOX TOP DAMPER SWITCH SPRING BURNER BOX DAMPER SWITCH COVER PATCH PLATE DAMPER PATCH PLATE DAMPER MOTOR/GEAR FIGURE 2

4 5(48,5(0(176 All G20 units are A.G.A. (American Gas Association) and C.G.A (Canadian Gas Association) certified. In the US, installation of Lennox gas central furnaces must conform with local building codes or, in the absence of local codes, with the current National Fuel Gas Code (ANSI--Z223.1). The National Fuel Gas Code is available from: American National Standards Institute, Inc Broadway New York, NY NOTE--G20X series units (units equipped with flame rods) are certified for use with natural gas only. Air supply for combustion and ventilation must conform to the methods outlined in the current National Fuel Gas Code. WARNING Product contains fiberglass wool. Disturbing the insulation in this product during installation, maintenance, or repair will expose you to fiberglass wool. Breathing this may cause lung cancer. (Fiberglass wool is known to the State of California to cause cancer.) Fiberglass wool may also cause respiratory, skin, and eye irritation. To reduce exposure to this substance or for further information, consult material safety data sheets available from address shown below, or contact your supervisor. Lennox Industries Inc. P.O. Box Dallas, TX The furnace is certified for installation clearances to combustible material as listed on the appliance rating plate and in table 1 for installations in an alcove or closet. TABLE 1 Clearances Location Inches (mm) Service access To combustible materials Front Top, side and rear Flue 36 (914)* 1 (25) 6 (152)** Floor 0 (0) From Draft Hood Front 6 (152) Relief Opening NOTE--Service access clearance must be maintained. * If tight installation, front service clearance may be 24 (610mm). **1 (25mm) for type B1 Vent Pipe. Accessibility and service clearances must take precedence over fire protection clearances. Vent installations shall be in accordance with the GAMA venting tables booklet supplied with this unit and applicable provisions of local building codes. NOTE--For installation on combustible floors, appliance shall not be installed directly on carpeting, tile, or other combustible material other than wood flooring. For installation in a residential garage, unit must be installed so that burner(s) and ignition source are located no less than 18 (457 mm) above floor. Furnace must be located or protected to avoid physical damage by vehicles. Unit must be adjusted to obtain a temperature rise within the range specified on appliance rating plate. The draft hood shall be installed in the same atmospheric pressure zone as the combustion air inlet to the furnace. G20 units must be installed so that electrical components are protected from water. When furnace is used in conjunction with cooling units, it shall be installed in parallel with, or on the upstream side of, cooling units to avoid condensation in the heating element. With a parallel flow arrangement, damper (or other means to control the flow of air) shall be adequate to prevent chilled air from entering the furnace and, if manually operated, must be equipped with means to prevent operation of either unit, unless damper is in the full heat or cool position. When installed, furnace must be electrically grounded in accordance with local codes or, in the absence of local codes, with the current National Electric Code, ANSI/NFPA No. 70. The National Electric Code (ANSI/ NFPA No. 70) is available from: National Fire Protection Association 470 Atlantic Avenue Boston, MA Field wiring connection with unit must meet or exceed specifications of type T wire and withstand a 63EF (17EC) temperature rise. When furnace is installed so that supply ducts carry air circulated by furnace to areas outside space containing furnace, return air shall be handled by a duct(s) sealed to the furnace casing and terminating outside space containing furnace. This furnace is certified for installation clearances to combustible material as listed on appliance rating plate and in table 1. Accessibility and service clearances must take precedence over fire protection clearances. In Canada, installation of C.G.A. certified units must conform with current Standard CAN/CGA--B149.1 Installation Code for Natural Gas Burning Appliances and Equipment and CAN/CGA--B149.2 Installation Code for Propane Gas Burning Appliances and Equipment, local plumbing or waste water codes and other applicable local codes. Authorities having jurisdiction should be consulted before installation. Adequate clear-

5 ance shall be made around air openings into the vestibule area. Provisions shall be made for proper operation and for combustion air and ventilation air supply according to the current CAN/CGA--B149 standards. All electrical wiring and grounding for the unit must be in accordance with the current regulations of the Canadian Electrical Code Part I (C.S.A. Standard C22.1) and/ or local codes. NOTE--G20 series units must not be used as a construction heater at any time during any phase of construction. Very low return air temperature, harmful vapors and misplacement of the filters will damage the unit and its efficiency. GENERAL These instructions are intended as a general guide and do not supersede local codes in any way. Authorities having jurisdiction should be consulted before installation. A--Shipping and Packing List 1--Leveling bolt package (if ordered) 1--Thermostat (if ordered) 1--Rubber grommet (for electrical make--up) B--Shipping Damage Check unit for shipping damage. Receiving party should contact last carrier immediately if any shipping damage is found. WARNING Improper installation, adjustment, alteration, service or maintenance can cause property damage, personal injury or loss of life. Installation and service must be performed by a qualified installer, service agency or the gas supplier. In the absence of local codes concerning air for combustion and ventilation, this section outlines guidelines and recommends procedures for installing G20 furnaces in a manner that ensures efficient and safe operation. Special consideration must be given to combustion air needs as well as requirements for exhaust vents and gas piping. A portion of this information has been reprinted with permission from the National Fuel Gas Code (ANSI--Z223.1). This reprinted material is not the complete and official position of the ANSI on the referenced subject, which is represented only by the standard in its entirety. In Canada, refer to the standard CAN/CGA--B149.1 and --B149.2 installation codes. Combustion Air Requirements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ntil recently, there was no problem in bringing in sufficient amounts of outdoor air for combustion ---- infiltration provided all the air that was needed and then some. In today s homes built with energy conservation in mind, tight construction practices make it necessary to bring in air from outside for combustion. Consideration must also be given to the use of exhaust fans, appliance vents, chimneys and fireplaces because they force additional air that could be used for combustion out of the house. Unless outside air is brought into the home for combustion, negative pressure (pressure outside is greater than inside pressure) will build to the point that a down draft can occur in the furnace vent pipe or chimney. Combustion gases enter the living space creating a potentially dangerous situation. All gas--fired appliances require air to be used for the combustion process. If sufficient amounts of combustion air are not available, the furnace or other appliance will operate in an inefficient and unsafe manner. Enough air must be provided to meet the needs of all fuel--burning appliances, as well as appliances such as exhaust fans which force air out of the home. When fireplaces, exhaust fans, or clothes dryers are used at the same time as the furnace, much more air is required to ensure proper combustion and to prevent a down--draft situation. Insufficient amounts of air also cause incomplete combustion which can result in carbon monoxide. The requirements for providing air for combustion and ventilation depend largely on whether the furnace is installed in an unconfined or confined space.

6 Unconfined Space An unconfined space is an area such as a basement or large equipment room with a volume greater than 50 cubic feet per 1,000 Btu (1.42 m 3 per.29kw) per hour of the combined input rating of all appliances installed in that space. This space also includes adjacent rooms which are not separated by a door. Though an area may appear to be unconfined, it might be necessary to bring in outdoor air for combustion if the structure does not provide enough air by infiltration. If the furnace is located in a building of tight construction with weather stripping and caulking around the windows and doors, follow the procedures outlined for using air from the outside for combustion and ventilation. Confined Space A confined space is an area with volume less than 50 cubic feet per 1,000 Btu (1.42 m 3 per.29kw) per hour of the combined input rating of all appliances installed in that space. This definition includes furnace closets or small equipment rooms. When the furnace is installed so that supply ducts carry air circulated by the furnace to areas outside the space containing the furnace, the return air must be handled by ducts which are sealed to the furnace casing and which terminate outside the space containing the furnace. This is especially important when the furnace is mounted on a platform in a confined space such as a closet or small equipment room. Even a small leak around the base of the unit at the platform or at the return air duct connection can cause a potentially dangerous negative pressure condition. Air for combustion and ventilation can be brought into the confined space either from inside the building or from outside. Air from Inside If the confined space housing the furnace adjoins space categorized as unconfined, air can be brought in by providing two permanent openings between the two spaces. Each opening must have a minimum free area of 1 square inch per 1,000 Btu (645mm 2 per.29kw) per hour of the total input rating of all gas--fired equipment in the confined space. Each opening must be at least 100 square inches (645cm 2). One opening shall be within (305mm) of the top of the enclosure and one opening within (305mm) of the bottom (See figure 3). Air from Outside If air from outside is brought in for combustion and ventilation, the confined space shall be provided with two permanent openings. One opening shall be within (305mm) of the top of the enclosure and one within (305mm) of the bottom. These openings must communicate directly or by ducts with the outdoors or spaces (crawl or attic) that freely communicate with the outdoors or indirectly through vertical ducts. Each opening shall have a minimum free area of 1 square inch per 4,000 Btu (645mm 2 per 1.17kW) per hour of total input rating of all equipment in the enclosure (See figures 4 and 5). When communicating with the outdoors through horizontal ducts, each opening shall have a minimum free area of 1 square inch per 2,000 Btu (645mm 2 per.59kw) per total input rating of all equipment in the enclosure (See figure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

7 &,01(< 25 *$6 9(17 (48,30(17,1 &21),1(' 63$&( $// $,5 ) ,'( $OO $LU 7KURXJK 9HQWLODWHG $WWLF 287/(7 $,5 9(17,/$7,21 /289(56 (DFK HQG RI DWWLF,167$//$7,216HWWLQJ (TXLSPHQW 1-- Holes are provided in the corners of unit base for leveling unit. Install leveling bolts (if desired) or shim under unit. See figure 7. 7(,I OHYHOLQJ EROWV DUH XVHG EH VXUH WR LQVWDOO WKH SODVWLF QXWV DQG WLJKWHQ VQXJO\ EHIRUH VHWWLQJ WKH XQLW /(9(/,1* %2/7,167$//$7,21 * )851$&(,1/(7 $,5 (QGV l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hen ducts are used, they shall be of the same cross-- sectional area as the free area of the openings to which they connect. The minimum dimension of rectangular air ducts shall be no less than 3 (76mm). In calculating free area, the blocking effect of louvers, grilles, or screens must be considered. If the design and free area of protective covering is not known for calculating the size opening required, it may be assumed that wood louvers will have 20 to 25 percent free area and metal louvers and grilles will have 60 to 75 percent free area. Louvers and grilles must be fixed in the open position or interlocked with the equipment so that they are opened automatically during equipment operation.,167$// 3/$67,& 1876 :,7 )/$7 6,'( 72:$5' %$6( /(9(/,1* %2/7 /(9(/ 81,7 :,7 7, Set unit in desired location allowing for clearances listed on appliance rating plate. Also allow for gas supply connection, electrical supply, vent connections and installation and service clearances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f cold air return is to terminate through the floor under the furnace, a direct, airtight and sealed connection must be made to the bottom of the furnace. For installations where the return air is taken from a return air drop, unit may be installed using either the left or right side of furnace. For side return air applications, cut furnace cabinet at sized knockout squares for maximum return air. Return air can be brought in either side or at the bottom of the unit. Scribe lines show the outline of each side return air opening.

8 ),/7(5 $66(0%/< $1' ),/7(56 G20 series units are equipped with a reusable foam filter. The filter must be in place anytime the unit is in operation. A bottom return air kit is available for bottom return air opening applications. For side return air openings, use supplied filter racks to hold filter. To install lower filter rack, remove two screws from lower side of cabinet. Place flange of filter rack inside bottom panel and side panel. Secure with previously removed cabinet/base bottom screws. To install upper filter rack, loosen screws from side of cabinet at blower deck level. Insert three tabs in slots that are on the inside of the cabinet. Tabs must be between side panel and blower deck flange. Retighten screws to secure. See figure 8. ),/7(5 5$&. )25 * 8VHG RQ VLGH UHWXUQ RQO\ 833(5 ),/7(5 5$&. 7$%6 '8&7 6<67(0 /2:(5 ),/7(5 5$&. /2:(5 ),/7(5 5$&. %27720 %$6( %/2:(5 '(&. 3/$&( 833(5 ),/7(5 5$&. 7$%,172 6/27 ),/7(5 6,'( 3$1(/ Size and install supply and return air duct system using industry--approved standards that result in a quiet and low--static system with uniform air distribution. Supply Air Duct System Installation of units not equipped with a cooling coil require a removable access panel in the supply air duct. The access panel should be large enough to permit inspection of heat exchanger for leaks after installation. Lennox recommends using the SENSIT TM HT kit for heat exchanger inspections. The access panel must not allow leaks in the supply air duct system. Return Air Duct System NOTE--All G20 series units with bottom return air require a bottom return kit which is available as an accessory. NOTE--Return air duct should be secured to the unit using rivets or S--locks. Using screws to secure the return air duct to the unit will interfere with the filter and cause improper filtration. 9(17,1* G20 series furnaces must be vented in compliance with all local codes, the venting tables provided in this manual for applications in the U.S.A., the current standards of CAN/CGA--B149.1 and --B149.2 in Canada, and these instructions. G20 series units have been classified as Category I type furnaces when vertically vented in accordance with the latest edition of ANSI Z21.47 Central Furnace Standard in the U.S.A. and the current standard of CAN/CGA-- B149.1 and B149.2 of the National Gas and Propane Installation Code in Canada. The vent sizing tables in this manual have been extracted from the National Fuel Gas Code (NFPA 54 / ANSI Z223.1) and are provided for convenience to serve as a guideline for proper vent installation. Proper application, termination, construction and location of vents must conform to local codes having jurisdiction. In the absence of local codes, the NFGC serves as the defining document. Refer to the tables and the venting information contained in these instructions for proper sizing and installation of the venting system. Use this information in conjunction with the provided venting tables in the U.S.A., and the appropriate venting tables in the standards of CAN/CGA--B149.1 and B149.2 of the National Gas and Propane Installation Code in Canada, to properly size the vent or vent connector that attaches to the furnace flue collar. Round vent connectors should be used in the following sizes: --50 and --75 units, 4 (102mm); units, 5 (7mm); and --5 and units, 6 (152mm). A 9 (229mm) minimum length vertical vent connector must be run from the furnace flue outlet to the first elbow. See figure 9. Venting Using a Masonry Chimney The following additional requirements apply when a lined masonry chimney is being used to vent an G20 furnace: A Category I appliance must never be connected to a chimney that is servicing a solid fuel appliance. If a fireplace chimney flue is used to vent this appliance, the fireplace opening must be permanently sealed. See figure 9. Any masonry chimney used for venting a G20 series gas furnace must be lined, and must be sized and installed per all applicable local building codes or, in the absence of local codes, the current National Fuel Gas Code (ANSI--Z223.1) in the U.S.A. and the current standards of CAN/CGA--B149.1 and --B149.2 in Canada. Venting in an unlined masonry chimney is prohibited. The effective area of the chimney serving a single appliance must be no less than the effective area of the draft hood outlet. The chimney must extend vertically at least 5 ft. (1.5m) above the flue collar.

9 l PP 0,1 9(57,&$/ 9(17 86,1* /,1(' 0$6215< &,01(< * )851$&( / 3(50$1(17/< 6($/(' ),5(3/$&( 23(1,1* A chimney with one or more sides exposed to the outside of the structure is considered to be an exterior chimney. A Type B or listed chimney lining system passing through an unused masonry chimney flue is not considered to be exposed to the outdoors. Masonry chimneys used to vent Category I central furnaces must be either tile--lined or lined with a listed metal lining system or dedicated gas vent. Unlined masonry chimneys are prohibited. A Type B vent or masonry chimney liner shall terminate above the roof surface with a listed cap or a listed roof assembly in accordance with the terms of their respective listings and the vent manufacturer s instructions. Do not install a manual damper, barometric draft regulator, or flue restrictor between the furnace and the chimney. If type B double--wall vent is used inside a chimney, no other appliance can be vented into the chimney. Outer wall of type B vent pipe must not be exposed to flue products. Insulation for the flexible vent pipe must be an encapsulated fiberglass sleeve recommended by the flexible vent pipe manufacturer. The space between liner and chimney wall should NOT be insulated with puffed mica or any other loose granular insulating material. If B vent or an insulated flexible vent pipe cannot be used as liners, the chimney must be rebuilt to accommodate one of these methods or some alternate approved method must be found to vent the appliance. 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 G20 series units. The chimney passageway must be checked periodically to ensure that it is clear and free of obstructions. General Venting Requirements All G20 furnaces must be vented in accordance with the methods outlined in these instructions. 1-- Vent diameter recommendations and maximum runs allowed are found in the provided venting tables in the U.S.A., and the appropriate venting tables in the standards of CAN/CGA--B149.1 and B149.2 of the National Gas and Propane Installation Code in Canada. 2-- In no case should the vent or vent connector diameter be less than the diameter specified in the provided venting tables in the U.S.A., and the appropriate venting tables in the standards of CAN/CGA--B149.1 and B149.2 of the National Gas and Propane Installation Code in Canada. 3-- For single appliance vents: If the vertical vent or tile--lined chimney has a larger diameter or flow area than the vent connector, use the vertical vent diameter to determine the minimum vent capacity and the vent connector diameter to determine the maximum vent capacity. The flow area of the vertical vent, however, shall not exceed 7 times the flow area of the listed appliance categorized vent area, drafthood outlet area or flue collar area unless designed in accordance with approved engineering methods. 4-- For multiple appliance vents: The flow area of the largest section of vertical vent or chimney shall not exceed 7 times the smallest listed appliance categorized vent area, flue collar area or drafthood outlet area unless designed in accordance with approved engineering methods. 5-- The entire length of single wall metal vent connector shall be readily accessible for inspection, cleaning, and replacement. 6-- Single appliance venting configurations with zero lateral lengths, see tables 2 and 3, are assumed to have no elbows in the vent system. For all other vent configurations, vent system is assumed to have two 90E elbows. For each additional 90E elbow or equivalent (for example two 45E elbows equal one 90E elbow) beyond two, the maximum capacity listed in venting table should be reduced by 10 percent (0.90 x maximum listed capacity). 7-- The common venting tables 4, 5, 6, and 7 were generated using a maximum horizontal vent connector length of 1--1/2 feet (18 inches) for each inch of connector diameter as follows: CONNECTOR DIAMETER (INCHES) MAXIMUM HORIZONTAL CONNECTOR LENGTH (FEET) / / /2

10 8-- If the common vertical vent is offset, the maximum common vent capacity listed in the common venting tables should be reduced by 20%, the equivalent of two 90E elbows (0.80 x maximum common vent capacity). The horizontal length of the offset shall not exceed 1--1/2 feet for each inch of common vent diameter. 9-- The vent pipe should be as short as possible with the least number of elbows and angles to do the job. The vent connector should be routed to the vent utilizing the shortest possible route A vent connector shall be supported without any dips or sags and shall slope a minimum of 1/4 per linear foot of connector, back towards the appliance. 11 Vent connectors shall be firmly attached to furnace flue collars by sheet metal screws or other approved means, except vent connectors of listed Type B vent material which shall be assembled in accordance with the manufacturer s instructions. Joints between sections of single wall connector piping shall be fastened by sheet metal screws or other approved means. -- When the vent connector used for Category I appliances must be located in or pass through a crawl space or other areas which may be cold, that portion of the vent connector shall be listed double--wall Type B vent material or material having equivalent insulation qualities All venting pipe passing through floors, walls, and ceilings must be installed with the listed clearance to combustible materials and be fire stopped according to local codes. In absence of local codes, refer to NFGC (Z223.1) No portion of the venting system can extend into, or pass through any circulation air duct or plenum Vent connectors serving Category I appliances shall not be connected to any portion of mechanical draft systems operation under positive pressure such as Category III or IV venting systems If vent connectors are combined prior to entering the common vent, the maximum common vent capacity listed in the common venting tables must be reduced by 10%, the equivalent of one 90E elbow (0.90 x maximum common vent capacity) Common vent diameter must always be at least as large as the largest vent connector diameter In no case, shall the vent connector be upsized more than two consecutive table size diameters over the size of the drafthood outlet or flue collar outlet A manual damper, barometric draft regulator or flue restrictor must not be installed between furnace and any chimney When connecting this appliance to an existing dedicated or common venting system, the venting system, must be inspected for signs of corrosion, and general condition. The sizing of the vent system must be reviewed and conform to these instructions and the provided venting tables in the U.S.A., and the appropriate venting tables in the standards of CAN/CGA--B149.1 and B149.2 of the National Gas and Propane Installation Code in Canada. If the existing system is in conflict with these requirements, the venting system must be resized. TABLE 2 CAPACITY OF TYPE B DOUBLE--WALL VENTS WITH TYPE B DOUBLE--WALL CONNECTORS SERVING A SINGLE CATEGORY I APPLIANCE Height H (feet) Vent and Connector Diameter -- D Lateral (inches) L 4 Inch 5 Inch 6 Inch (feet) MAXIMUM Appliance Input Rating in Thousands of Btu Per Hour NR NR 219 NOTE: Single appliance venting configurations with zero lateral lengths are assumed to have no elbows in the vent system. For all other vent configurations, the vent system is assumed to have two 90E elbows. For each additional 90E elbow or equivalent (for example two 45E elbows equal one 90E elbow) beyond two, the maximum capacity listed in the venting table should be reduced by 10 percent (0.90 x maximum listed capacity).

11 TABLE 3 CAPACITY OF TYPE B DOUBLE--WALL VENTS WITH SINGLE--WALL METAL CONNECTORS SERVING A SINGLE CATEGORY I APPLIANCE Height H (feet) Vent and Connector Diameter -- D Lateral (inches) L 4 Inch 5 Inch 6 Inch (feet) MAXIMUM Appliance Input Rating in Thousands of Btu Per Hour NR NR NR NR NR NR NR NOTE: Single appliance venting configurations with zero lateral lengths are assumed to have no elbows in the vent system. For all other vent configurations, the vent system is assumed to have two 90E elbows. For each additional 90E elbow or equivalent (for example two 45E elbows equal one 90E elbow) beyond two, the maximum capacity listed in the venting table should be reduced by 10 percent (0.90 x maximum listed capacity). TABLE 4 CAPACITY OF TYPE B DOUBLE--WALL VENTS WITH TYPE B DOUBLE--WALL CONNECTORS SERVING TWO OR MORE CATEGORY I APPLIANCES VENT CONNECTOR CAPACITY Vent Height H (feet) Connector Rise R (feet) Vent and Connector Diameter -- D (inches) 4 Inch 5 Inch 6 Inch MAXIMUM Appliance Input Rating in Thousands of Btu Per Hour TABLE 5 CAPACITY OF TYPE B DOUBLE--WALL VENTS WITH TYPE B DOUBLE--WALL CONNECTORS SERVING TWO OR MORE CATEGORY I APPLIANCES COMMON VENT CAPACITY Vent Heig ht H (feet) Common Vent Diameter -- D (inches) 4 Inch 5 Inch 6 Inch 7 Inch Appliance Input Rating in Thousands of Btu Per Hour FAN FAN FAN FAN

12 TABLE 6 CAPACITY OF TYPE B DOUBLE--WALL VENT WITH SINGLE--WALL METAL CONNECTORS SERVING TWO OR MORE CATEGORY I APPLIANCES VENT CONNECTOR CAPACITY Vent Height H (feet) Connector Rise R (feet) Vent and Connector Diameter -- D (inches) 4 Inch 5 Inch 6 Inch MAXIMUM Appliance Input Rating in Thousands of Btu Per Hour TABLE 7 CAPACITY OF TYPE B DOUBLE--WALL VENTS WITH SINGLE--WALL METAL CONNECTORS SERVING TWO OR MORE CATEGORY I APPLIANCES COMMON VENT CAPACITY Vent Heig ht H (feet) Common Vent Diameter -- D (inches) 4 Inch 5 Inch 6 Inch 7 Inch Appliance Input Rating in Thousands of Btu Per Hour FAN FAN FAN FAN Removal of Unit from Common Venting System In the event that an existing furnace is removed from a venting system commonly run with separate gas appliances, the venting system is likely to be too large to properly vent the remaining attached appliances. The following test should be conducted while each appliance in operation and the other appliances not in operation remain connected to the common venting system. If the venting system has been installed improperly, the system must be corrected as outlined in the previous section. 1-- Seal any unused openings in the common venting system. 2-- Visually inspect the venting system for proper size and horizontal pitch and determine there is no blockage or restriction, leakage, corrosion and other deficiencies which could cause an unsafe condition. 3-- Insofar as is practical, close all building doors and windows and all doors between the space in which the appliances remaining connected to the common venting system are located and other spaces of the building. Turn on clothes dryers and any appliances not connected to the common venting system. Turn on any exhaust fans, such as range hoods and bathroom exhausts, so they will operate at maximum speed. Do not operate a summer exhaust fan. Close fireplace dampers. 4-- Follow the lighting instruction. Place the appliance being inspected in operation. Adjust thermostat so appliance will operate continuously. 5-- Test for spillage at the draft hood relief opening after 5 minutes of main burner operation. Use the flame of a match or candle, or smoke from a cigarette, cigar or pipe. 6-- After it has been determined that each appliance remaining connected to the common venting system properly vents when tested as outlined above, return doors, windows, exhaust fans, fireplace dampers and any other gas--burning appliance to their previous condition of use. 7-- If improper venting is observed during any of the above tests, the common venting system must be corrected. The common venting system should be re--sized to approach the minimum size as determined by using the appropriate tables in appendix G in the current standards of the National Fuel Gas Code ANSI Z in the U.S.A., and the appropriate Category 1 Natural Gas and Propane appliances venting sizing tables in the current standards of the CAN/CGA--B149.1 and.2 in the Natural Gas and Propane Installation Code in Canada.

13 RUL]RQWDO 9HQWLQJ 33& & 237,21$/ 6,'( :$// 9(17,1*.,7 :,5,1* &. &21752/ %2; 35(6685( 6:,7& / / 9$& / (/$< 0 $ % 6:* 32:(5 9(17( (50267$7 &211(&7,216 7(50,1$/,1 )851$&( -81&7,21 %2; : 5 < 7 * 5 * < : 9$& 7(50267$7 )$&725<,167$//(' :,5,1* ),(/',167$//(' :,5,1* This furnace is design certified by the American Gas Association for horizontal venting through an outside wall only with the use of a Field Controls Company Model #SWG--5L side wall venting kit available from Lennox Dealer Service Center. No other Field brand venting kit or any other manufacturer s venting kit is acceptable. Horizontal venting of this furnace without the use of the above stated kit is prohibited. See figure 10 for field wiring of side wall horizontal venting kit. When horizontally vented, minimum clearance for termination from electric meters, gas meters, regulators and relief equipment is 4 ft. (1.2m). At vent termination, care must be taken to maintain protective coatings over building materials (prolonged exposure to exhaust condensate can destroy protective coatings). It is recommended that the exhaust outlet not be located within 6 ft. (1.8m) of a condensing unit because the condensate can damage the painted coating.

14 *$6 3,3,1* Gas Supply 1-- This unit is shipped standard for left side installation of gas piping. Simply connect gas supply to piping assembly. 2-- A piping hole is also fabricated in the right side of the unit for alternate piping arrangements. 3-- When connecting gas supply, factors such as length of run, number of fittings and furnace rating must be considered to avoid excessive pressure drop. Table 8 lists recommended pipe sizes for typical applications. 4-- Gas piping must not run in or through air ducts, clothes chutes, chimneys or gas vents, dumb waiters or elevator shafts. 5-- Piping should be sloped 1/4 inch per 15 feet (6mm per 4.57m) upward toward the meter from the furnace. The piping must be supported at proper intervals, every 8 to 10 feet (2.44m to 3.05m), using suitable hangers or straps. A drip leg should be installed in vertical pipe runs to the unit. 6-- In some localities, codes may require installation of a manual main shut--off valve and union (furnished by installer) external to the unit. Union must be of the ground joint type.,03257$17 &RPSRXQGV XVHG RQ WKUHDGHG MRLQWV RI JDV SLSLQJ PXVW EH UHVLVWDQW WR WKH DFWLRQV RI OLTXLILHG SHWUR OHXP JDVHV Nominal Iron Pipe Size --Inches(mm) Internal Diameter --Inches(mm) 10 (3.048) NOTE--In the case emergency shut--off is required, shut off main manual gas valve and disconnect main power to unit. These devices should be properly labeled by the installer. NOTE--Installer must provide a 1/8 (3.2mm) N.P.T. plugged tap in the field piping upstream of the gas supply connection to the unit. Tap must be accessible for test gauge connection. See figure 11. 0$18$/ 0$, )) 9$/9( :LWK l PP 137 3OXJJHG 7DS 6KRZQ *5281' -2,17 81,21 ),(/' 3529,'(' '5,3 /(* $1',167$//(' $8720$7,& *$6 9$/9( ZLWK PDQXDO VKXW RII YDOYH TABLE 8 GAS PIPE CAPACITY -- FT 3 /HR (kl/hr) Length of Pipe--Feet(m) 20 (6.096) 30 (9.144) 40 (.192) 50 (15.240) 60 (18.288) /()7 6,'( 3,3,1* 67$1'$5' $8720$7,& *$6 9$/9( ZLWK PDQXDO VKXW RII YDOYH 70 (21.336) 5,*7 6,'( 3,3,1* $/7(51$7( 80 (24.384) 0$18$/ 0$, )) 9$/9( :LWK l PP 137 3OXJJHG 7DS 6KRZQ *5281' -2,17 81,21 '5,3 /(* 90 (27.432) 100 (30.480) 1/ (6.35) (9.246) (1.13) (.82) (.68) (.57) (.51) (.45) (.42) (.40) (.37) (.34) 3/ (9.53) (.522) (2.69) (1.84) (1.47) (1.27) (1.13) (1.02) (.73) (.88) (.82) (.76) 1/ (.7) (17.799) (4.96) (3.40) (2.75) (2.32) (2.07) (1.87) (1.73) (1.61) (1.50) (1.42) 3/ (19.05) (20.930) (10.19) (7.08) (5.66) (4.81) (4.28) (3.91) (3.54) (3.34) (3.11) (2.92) (25.4) (26.645) (919.25) (13.17) (10.62) (9.06) (8.07) (7.36) (6.80) (6.23) (5.80) (5.52) 1--1/ (31.75) (35.052) (39.64) (26.90) (21.80) (18.69) (16.42) (15.01) (13.87) (13.03) (.18) (11.33) 1--1/ (38.1) (40.894) (59.46) (41.34) (33.41) (28.03) (25.48) (22.94) (21.24) (19.54) (18.41) (17.56) (50.8) (52.502) (111.85) (77.87) (62.30) (53.80) (47.57) (43.04) (39.64) (36.81) (34.55) (32.56) 2--1/ (63.5) (67.713) (178.39) (3.17) (99.67) (84.95 (75.04) (67.96) (63.71) (58.05) (55.22) (52.38) (76.2) (77.927) (311.48) (218.03) (176.98) (150.07) (134.50) (1.76) (110.43) (104.77) (97.69) (92.03) (101.6) ( ) (651.27) (447.39) (362.44) (308.64) (274.67) (249.18) (229.36) (2.37) (203.88) (189.72) NOTE--Capacity given in cubic feet of gas per hour (kilo liters of gas per hour) and based on 0.60 specific gravity gas.

15 Leak Check After gas piping is completed, carefully check all piping connections (factory and field) for gas leaks. Use a leak detecting solution or other preferred means. &$87,21 6RPH VRDSV XVHG IRU OHDN GHWHFWLRQ DUH FRUURVLYH WR FHUWDLQ PHWDOV &DUHIXOO\ ULQVH SLSLQJ WKRURXJKO\ DIWHU OHDN WHVW KDV EHHQ FRPSOHWHG 'R QRW XVH PDWFKHV FDQGOHV IODPH RU RWKHU VRXUFHV RI LJQL WLRQ WR FKHFN IRU JDV OHDNV NOTE--In case emergency shutdown is required, shut down main manual gas valve and disconnect main power to unit. These devices should be properly labeled by the installer.,03257$17 :KHQ WHVWLQJ SUHVVXUH RI JDV OLQHV JDV YDOYH PXVW EH GLVFRQQHFWHG DQG LVRODWHG 6HH ILJXUH *DV YDOYHV FDQ EH GDPDJHG LI VXEMHFWHG WR PRUH WKDQ SVLJ N3D 0$18$/ 0$, )) 9$/9( :,// 7 2/' 50$/ 7(67 35(6685( &$3 )851$&(,62/$7( *$6 9$/9( The furnace must be isolated from the gas supply system by closing its individual manual shut--off valve during any pressure testing of the gas supply system at pressures equal to or less than 1/2 psig (3.48 kpa).,03257$17 *; VHULHV XQLWV XQLWV HTXLSSHG ZLWK IODPH URGV DUH DSSURYHG IRU XVH ZLWK QDWXUDO JDV RQO\ (/(&75,&$/ Refer to figure 13 for blower control board, figure 14 for point to point field wiring and figure 15 for schematic wiring diagrams and troubleshooting. 1-- Select fuse and wire size according to the blower motor amps. 2-- Snaphole plugs are provided on both sides of cabinet to facilitate wiring. 3-- Install room thermostat according to instructions provided with thermostat. 4-- Install a separate fused disconnect switch near the unit so power can be turned off for servicing. 5-- Before connecting thermostat wiring to unit, remove screws holding the hinged section of the control box. Swing the hinged section downward to to ensure wires are proper length. 6-- Complete wiring connections to equipment using wiring diagrams provided with unit and in figures 14, 15 and NO TAG. Use 18 gauge wire or larger for thermostat connections. 7-- Electrically ground unit in accordance with local codes or, in the absence of local codes, in accordance with the current National Electric Code (ANSI/ NFPA No. 70) and in Canada with the current Canadian Electric Code part 1 (CSA standard C22.1). 7(1RQ LQVXODWHG JURXQG ZLUHV PXVW EH ZUDSSHG LQ HOHFWULFDO WDSH WR DYRLG GDPDJLQJ WKH %&& EORZHU FRQWURO FHQWHU 8-- A 0 volt accessory terminal (ACC) is provided on the BCC2 blower control center. Any accessory rated up to 1 amp can be connected to this terminal and the neutral leg of the accessory can be attached to any free 0 volt neutral terminal on the BCC2 blower control center. The accessory terminal is energized whenever the blower is in operation. See figure 13. A troubleshooting flowchart for the BCC2 blower control is located in figure The continuous fan (CF) 0 volt terminal is used with an optional continuous low fan kit that is available from Lennox. The kit allows the furnace blower to run continuously on low speed.

16 1(875$/ 7(50,1$/6 %&& %/2:(5 &21752/ %2$5' &22/,1* 63((' 7$3 7(50,1$/ '800< 7(50,1$/6 &217,18286 )$1 7(50,1$/ ($7,1* 63((' 7$3 7(50,1$/ $&&(6625< 7(50,1$/ %/2:(5 7,0( $'-8670(17-803(5 7(50267$7 7(50,1$/ 675,3 '(7$&$%/( 7R 5HPRYH 7HUPLQDO 6WULS *UDVS (QGV RI %ORFN %HWZHHQ 7KXPE DQG )RUHILQJHU 3XVK %ORFN 'RZQ DQG 2XW 7<3,&$/ * ),(/' :,5,1* ',$*5$0 * 7(50267$7 < 5 : '$03(5 '225 6:,7& )/$0( 52//287 6:,7& *$6 9$/9( %/2&.(' 9( )) 6:,7& /,0,7,*1,7,21 &21752/ )86(' ',6&211(&7 6:,7& )851,6(' %<,167$//(5 / 1 &21752/ %2; 75$16)250(5 %/$&. :,7( *5281' : 5 < & * %&& &21752/ '225,17(5/2&. 6:,7& 72 &2035(6625 &217$&725 ),(/',167$//(' /2: 92/7$*( ),(/',167$//(' /,1( 92/7$*(

17 7<3,&$/ *( :,5,1* ',$*5$0

18 81,7 67$5783 FOR YOUR SAFETY READ BEFORE LIGHTING :$51,1* 'R QRW XVH WKLV IXUQDFH LI DQ\ SDUW KDV EHHQ XQGHU ZDWHU,PPHGLDWHO\ FDOO D TXDOLILHG VHUYLFH WHFKQL FLDQ WR LQVSHFW WKH IXUQDFH DQG WR UHSODFH DQ\ SDUW RI WKH FRQWURO V\VWHP DQG DQ\ JDV FRQWURO ZKLFK KDV EHHQ XQGHU ZDWHU :$51,1*,I RYHUKHDWLQJ RFFXUV RU LI JDV VXSSO\ IDLOV WR VKXW RII VKXW RII WKH PDQXDO JDV YDOYH WR WKH DSSOLDQFH EHIRUH VKXWWLQJ RII HOHFWULFDO VXSSO\ &$87,21 7(50267$ Remove control access panel. 6-- On Honeywell VR8204 gas valves, turn knob on gas valve clockwise to OFF. Units with Robertshaw 7200 gas valve, depress lever and move to OFF position. Do not force. See figure 18. HONEYWELL VR8204 SERIES GAS VALVE %HIRUH DWWHPSWLQJ WR SHUIRUP DQ\ VHUYLFH RU PDLQ WHQDQFH WXUQ WKH HOHFWULFDO SRZHU WR XQLW 2)) DW GLVFRQQHFW VZLWFK BEFORE LIGHTING smell all around the appliance area for gas. Be sure to smell next to the floor because some gas is heavier than air and will settle on the floor. Use only your hand to push in or turn the gas control knob or lever. Never use tools. If the knob or lever will not push in or turn by hand, do not try to repair it, call a qualified service technician. Force or attempted repair may result in a fire or explosion. To place G20 furnace into operation: All G20 units are equipped with an intermittent pilot ignition system. Do not attempt to manually light pilots on these furnaces. Each time thermostat calls for heat, the pilot will automatically light. The pilot does not burn when there is no call for heat on units with electronic ignitions. :$51,1*,I \RX GR QRW IROORZ WKHVH LQVWUXFWLRQV H[DFWO\ D ILUH RU H[SORVLRQ PD\ UHVXOW FDXVLQJ SURSHUW\ GDPDJH SHUVRQDO LQMXU\ RU ORVV RI OLIH *DV 9DOYH 2SHUDWLRQ )LJXUHV 1-- STOP! Read the safety information at the beginning of this section. 2-- Set thermostat to lowest setting. See figure Turn off all electrical power to appliance. 4-- This appliance is equipped with an ignition device which automatically lights the pilot. Do not try to light the pilot by hand. *$6 9$/9( 6(/(&725 $50,1 2)) 326,7,21 2)) 21 *$6 9$/9( 62:1,1 2)) 326,7,21 52%(576$: *$6 9$/9( 7-- Wait five (5) minutes to clear out any gas. If you then smell gas, STOP! Immediately call your gas supplier from a neighbor s phone. Follow the gas supplier s instructions. If you do not smell gas go to next step. 8-- On Honeywell VR8204 gas valves, turn knob on gas valve counterclockwise to ON. Units with Robertshaw 7200 gas valve, depress lever and move to ON position. Do not force. 9-- Replace control access panel Turn on all electrical power to unit.

19 11-- Set thermostat to desired setting. NOTE--When unit is initially started, steps 1 through 11 may need to be repeated to purge air from pilot line. -- If the appliance still will not operate, follow the instructions To Turn Off Gas To Unit and call your service technician or gas supplier. 7R 7XUQ 2II *DV 7R 8QLW 1-- Set thermostat to lowest setting. 2-- Turn off all electrical power to unit if service is to be performed. 3-- Remove control access panel. 4-- On Honeywell VR8204 gas valves, turn knob on gas valve clockwise to OFF. Units with Robertshaw 7200 gas valve, depress lever and move tooff position. Do not force. 5-- Replace control access panel. 2-- After line pressure has been checked and adjusted, check manifold pressure. Correct manifold pressure for LP/propane gas is 9.5 w.c. (2.36kPa) No adjustment is needed in high altitude applications. A natural gas to LP/propane gas changeover kit is required to convert unit. Refer to the installation instructions supplied with changeover kit for conversion procedure. Correct manifold pressure for natural gas is 3.5 w.c. (.87kPa). No adjustment is needed in high altitude applications. See figures 19 and 20 for manifold pressure adjustment screw location. 52%(576$: *$6 9$/9( 5(*8/$725 $'-8670(17 6&5(: /2&$7,21 5(*8/$725 &29(5 6&5(: $'-867,1* 6&5(:,* $/7,78'(,1)250$7,21 G20 series units are certified for installations from 0 to 4000 feet (0 to 19m) above sea level without modification. For installations from 4000 feet to 7500 feet (19m to 2286m) above sea level, a high altitude kit (44H56) must be installed. The kit contains special flue baffles used to replace factory--installed baffles. No derate is required.,1/(7 35(6685( 7$3 *$6 35(6685( $'-8670(17 Gas Flow To check for proper gas flow to combustion chamber, determine Btu input from appliance rating plate. Divide this input rating by the Btu per cubic foot of available gas. Result is the required number of cubic ft. (cubic meter) per hour. Determine the flow of gas through gas meter for two minutes and multiply by 30 to get the hourly flow of gas to burner. Gas Pressure 1-- Check gas line pressure with unit firing at maximum rate. A minimum of 4.5 w.c. (1.kPa) for natural gas or 10.5 w.c. (2.61kPa) for LP/propane gas should be maintained. 21(<:(// *$6 9$/9( 5(*8/$725 $'-8670(17 6&5(: /2&$7,21 35(6685( 5(*8/$725 $'-867,1* 6&5(: :KLWH &$3 6&5(: %ODFN,1/(7 35(6685( 7$3 *$6,1/(7

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