MERIT SERIES Upflow / Horizontal

PRODUCT SPECIFICTIONS GS FURNCES ML80UH MERIT SERIES Upflow / Horizontal Bulletin No. 20590 February 208 Supersedes November 207 FUE - 80% Input - 44,000 to 32,000 Btuh Nominal dd-on Cooling - 2 to 5 Tons MODEL NUMBER IDENTIFICTION ML 80 UH 070 X P 36 B Unit Type ML = Merit Series Stages = Single-Stage FUE 80 = 80% Configuration UH = Upflow/Horizontal Nominal Gas Heat Input 045 = 44,000 Btuh 070 = 66,000 Btuh 090 = 88,000 Btuh 0 = 0,000 Btuh 35 = 32,000 Btuh Cabinet Width = 4-/2 in. B = 7-/2 in. C = 2 in. D = 24-/2 in. Nominal dd-on Cooling Capacity 24 = 2-2.5 tons 36 = 2-3.5 tons 48 = 4 tons 60 = 4-5 tons Blower P = PSC Multi-Speed Blower Motor Low NO x X = Units meet California Nitrogen Oxides standards Indoor coils with the same letter designation will physically match the furnace.

FETURES J CONTENTS Blower Data... 4 Dimensions - Furnace/Coil Combined Dimensions... 3 B Dimensions - Horizontal Position... Dimensions - Upflow Position... 0 Features... 2 Gas Heat ccessories... 8 G E F D L High ltitude Derate... 8 Installation Clearances... 9 C Model Number Identification... Optional ccessories - Order Separately... 8 K Optional ccessory Dimensions... 2 Specifications... 7 I H NOTE - ML80UH FURNCES RE NOT VILBLE IN CND! WRRNTY Duralok luminized Steel Heat Exchanger - Limited twenty year warranty in residential applications, ten years in non-residential applications. ll other covered components - Limited five year warranty in residential applications, one year in nonresidential applications. Refer to Lennox Equipment Limited Warranty certificate included with equipment for details. PPROVLS Units are Certified by HRI. Units tested and rated according to US DOE test procedures and FTC labeling regulations. X models approved by the California Energy Commission and meet California Seasonal Efficiency requirements and California Nitrogen Oxides (NOx) Standards. ISO 900 Registered Manufacturing Quality System. Blower data from unit tests conducted in Lennox Laboratory air test chamber. PPLICTIONS Input capacities of 44,000, 66,000, 88,000, 0,000 and 32,000 Btuh. Energy efficiency (FUE) of 80%. Compact cabinet for upflow, horizontal-left or horizontalright applications. Utility room, alcove, closet, crawl space, basement or attic installation. Lennox add-on indoor coils, high-efficiency air cleaners and humidifiers can easily be added to furnace. Shipped factory assembled with all controls installed and wired. Ready for installation in upflow or horizontal right-hand position without any modifications. Horizontal left-hand position requires repositioning of pressure switch. Removable bottom seal panel shipped in place for side return air is easily removed for bottom/end return air applications. Each unit factory test operated to ensure proper operation. ML80UH / Page 2

B C D E F FETURES HETING SYSTEM Lennox Duralok Heat Exchanger ssembly Heavy gauge aluminized steel heat exchanger. Crimped seam clamshell type design. Designed for normal expansion and contraction. Minimum resistance to air flow. Heat exchanger has been laboratory life cycle tested in excess of industry standards. Compact size of heat exchanger permits low overall design of furnace cabinet. Inshot Burners luminized steel inshot burners provide efficient, trouble-free operation. Burner venturi mixes air and gas in correct proportion for proper combustion. Burner assembly is removable from the unit as a single component for ease of service. SureLight Hot Surface Ignitor Tough, reliable, long-life, trouble-free performance. Silicon nitride ignitor. Cemented to steatite block for protection against current leakage. Ignition leads are constructed of nickel plated copper and are enclosed in high temperature Teflon insulation for dependable operation. Gas Control Valve 24 volt redundant combination gas control valve combines manual shut off switch (On-Off), automatic electric valve (dual) and gas pressure regulation into a compact combination control. Combustion ir Inducer Shaded pole heavy duty blower prepurges heat exchanger and safely vents flue products. switch proves blower operation before allowing gas valve to open. Operates only during heating cycle. Direct access allows inducer assembly to be rotated 90 clockwise or counterclockwise to facilitate easy vent attachment in horizontal applications. G H Flame Rollout Switches (2) Manual reset switches are factory installed on the front of the burner box. Switches provides protection from abnormal operating conditions. Limit Control utomatic reset, primary limit is accurately located on vestibule panel on all units. Optional ccessories High ltitude Switch Kit Required on most units for proper unit operation at altitudes from 4,50 to 7500 ft. Natural Gas to LPG/Propane Conversion Kit Required for field changeover from natural gas to LPG/ Propane. LPG/Propane to Natural Gas Conversion Kit Required for field changeover from LPG/Propane to natural gas. Vent daptor (Upflow pplications Only) llows venting through a masonry chimney without the need of a flue liner. Manual reset temperature sensor protects against abnormal operating conditions. Sensor wiring may be routed from either side of adaptor. Minimum winter design temperatures: 0 F when used with interior masonry chimneys. +5 F when used with exterior masonry chimneys. Refer to Winter Design Temperatures Map on page 6 for application information. lso refer to the installation instructions for detailed information. BLOWER Multi-speed direct drive blower. Statically and dynamically balanced. Resiliently mounted. 6 in. (52 mm) Blower assembly easily removed for servicing. 7 in. (78 mm) Blower speeds are easily changed on the integrated furnace control. See blower performance tables. ML80UH / Page 3

FETURES I CONTROLS SureLight Integrated Furnace Control Contains all necessary controls and relays to operate furnace. Combustion air inducer is controlled by the integrated furnace control. Prior to ignition, a pre-purge cycle for 5 seconds is initiated. fter the main burners are turned off, a post-purge cycle for 5 seconds is run. Flame sensor assures safe and reliable operation. Should loss of flame occur, flame sensor controls will initiate 4 re-attempts at ignition before locking out unit operation for 60 minutes. Watchguard type circuit automatically resets ignition controls after one hour of continuous thermostat demand after unit lockout, eliminating nuisance calls for service. Fan control consists of adjustable blower timed-off delay (60, 90, 20, 80 seconds - factory setting 20 seconds) and fixed blower timed-on delay (45 seconds). For air-conditioning applications, blower is automatically energized on thermostat demand for cooling. Integrated furnace control has one red LED to indicate status and indicate diagnostic codes. Push button recall of the last 5 diagnostic codes aids in troubleshooting. Integrated furnace control has built-in twinning capability ( TWIN terminal on control) to operate two furnaces simultaneously without any additional controls. field supplied isolation relay is required to operate the twinned (no thermostat connection) furnace. Two accessory terminals furnished for additional power supply requirements for 20 volt (less than amp) power humidifiers and powered air cleaners. Night Service Kit Contains most commonly used service parts: Furnace Control Ignitor Flame sensor Gas valve Transformer Optional ccessories ir Filter and Rack Kit for Horizontal Return ir (End) pplications Washable or vacuum cleanable polyurethane frame type filter and external end return air rack available for field installation. Rack has filter door for easy filter servicing. Flanges on rack allow easy duct connection. See dimension drawing. ir Filter and Rack Kit for Upflow Side Return ir pplications - Not for use with Return ir Base Washable or vacuum cleanable polyurethane frame type filter and external side return air rack available for field installation. vailable in single and ten pack kits. Rack has filter door for easy filter servicing. Flanges on rack allow easy duct connection. Field installs on either side of unit cabinet. See dimension drawing. 24 Volt Transformer Furnished and factory installed on outside of control box. 40V transformer has fuse wired in series. Field Wiring Make-Up Box Furnished for line voltage wiring. Factory installed internally on left side of furnace. Box may be installed on right side of furnace. Optional ccessories Thermostat Thermostat (programmable/non-programmable) is not furnished with unit. See Thermostat bulletins in Controls Section and Lennox Price Book for selection. ML80UH / Page 4

FETURES J K L CBINET Low-profile, narrow width cabinet allows easy installation. Heavy-gauge, cold rolled steel construction. Pre-painted cabinet finish. Flue outlet on top of cabinet for upflow applications, can be relocated to either side of cabinet for horizontal applications. Flanges provided on supply air opening for ease of plenum connection or alignment with indoor coil. Insulated cabinet with foil faced insulation on sides and back of heating compartment. Complete service access. Safety interlock switch automatically shuts off power to unit when blower compartment access panel is removed. Gas piping and electrical inlets are provided in both sides of cabinet. Return ir Entry: For bottom/end return-air entry for upflow/horizontal applications, remove furnished bottom seal panel from cabinet. For side return-air entry (upflow applications only), corners are marked on either side of cabinet for return air cut-outs. See dimension drawings. NOTE - 60C and 60D size units that require air volumes over 800 cfm must have one of the following:. Single side return air and Optional Return ir Base with transition that must accommodate required 20 x 25 x inch air filter to maintain proper velocity. 2. Bottom return air. 3. Return air from both sides. 4. Bottom and one side return air. See Blower Performance Tables for additional information. Coil Match-Up ll furnaces exactly match Lennox cased upflow indoor coils and horizontal indoor coils with same letter designation (, B, C, D) in model number. No adaptor required. Engaging holes furnished on cabinet for alignment. Lennox uncased coils match furnaces without any overhang but require an optional adaptor base or field fabricated transition to match furnace opening. See coil bulletin for additional information. Optional ccessories Horizontal Suspension Kit Provides suspension of unit and indoor coil in horizontal applications. llows complete service access. Consists of corner mounted hanging brackets with vibration isolators, return air end support rail and hardware for assembly. Metal hanging straps must be field provided. Return ir Base field fabricated transition or Return ir Base is required when using an IQ product higher than 4-3/6 in. installed next to the unit and serviced from the front. IQ products higher than 20 in. require a field fabricated transition. Base must be used for 60C and 60D models with air volumes over 800 cfm in upflow applications when only one side return is required. Cabinet is shipped flat for easy field assembly and is pre-painted steel to match the furnace. See Dimension Drawing. High Performance Economizer (Commercial pplications Only) Designed for applications requiring outdoor air to be utilized in a commercial HVC system. llows the entry of fresh outdoor air for free cooling, reducing the requirement for mechanical cooling. Heavy gauge galvanized steel cabinet lined with thick fiberglass insulation. Mixed air sensor, outdoor air sensor and 24VC transformer furnished. pproved for California Title 24 building standards. SHRE 90.-200 compliant. See separate Product Specifications bulletin for additional information and available control and sensor options. FILTER (not furnished) Filter and provisions for external mounting must be field provided. Low Leakage Cabinet ll models have less than 2% air leakage and meet NSI/SHRE Standard 93-200 Method of Test for Determining the ir Tightness of HVC Equipment. ML80UH / Page 5

99% WINTER DESIGN TEMPERTURES FOR THE CONTIGUOUS UNITED STTES 5 o F 0 o F 7 o F 27 o F 0 o F 5 o F 37 o F 0 o F 7 o F 27 o F 37 o F This map is a necessarily generalized guide to temperatures in the contiguous Unites States. Temperatures shown for areas such as mountainous regions and large urban centers may not be accurate. The data used to develop this map was taken from the 993 SHRE Fundamentals Handbook (Chapter 24, Table : Climate Conditions for the United States). Reprinted with permission from NFP 54: National Fuel Gas Code 999, National Fire Protection ssociation, Quincy, M 02269. This reprinted material is not the complete and official position of the National Fire Protection ssociation on the referenced subject, which is represented only by the standard in its entirety. ML80UH / Page 6

SPECIFICTIONS Gas Model No. ML80UH045P24 ML80UH045P36 ML80UH070P24 ML80UH070P36 Heating Model No. - Low Nox - - - ML80UH045XP36 - - - ML80UH070XP36 Performance FUE 80% 80% 80% 80% Input - Btuh 44,000 44,000 66,000 66,000 Output - Btuh 35,000 35,000 54,000 54,000 Temperature rise range - F 20-50 5-45 30-60 30-60 Gas Manifold (in. w.g.) Nat. Gas / LPG/Propane 3.5 / 0.0 3.5 / 0.0 3.5 / 0.0 3.5 / 0.0 High Static - in. w.g. 0.50 0.50 0.50 0.50 Connections Flue connection - in. round 4 4 4 4 in. Indoor Blower Electrical Data Gas pipe size IPS /2 /2 /2 /2 Wheel nom. dia. x width - in. 0 x 7 0 x 8 0 x 7 0 x 8 Motor output - hp /5 /3 /5 /3 Tons of add-on cooling.5-2 2-3.5-2 2-3 ir Volume Range - cfm 345-30 650-670 420-60 785-660 Voltage 20 volts - 60 hertz - phase Blower motor full load amps 3. 6. 3. 6. Maximum overcurrent protection 5 5 5 5 Shipping Data lbs. - package 05 0 4 9 SPECIFICTIONS Gas Model No. ML80UH090P36B ML80UH090P48B ML80UH0P48C Heating Model No. - Low Nox - - - ML80UH090XP48B - - - Performance FUE 80% 80% 80% Input - Btuh 88,000 88,000 0,000 Output - Btuh 7,000 7,000 89,000 Temperature rise range - F 25-55 25-55 25-55 Gas Manifold (in. w.g.) Nat. Gas / LPG/Propane 3.5 / 0.0 3.5 / 0.0 3.5 / 0.0 High Static - in. w.g. 0.50 0.50 0.50 Connections Flue connection - in. round 4 4 4 in. Indoor Blower Electrical Data Gas pipe size IPS /2 /2 /2 Wheel nom. dia. x width - in. 0 x 9 0 x 0 0 x 0 Motor output - hp /3 /2 /2 Tons of add-on cooling 2-3 3-4 3-4 ir Volume Range - cfm 680-795 920-260 90-270 Voltage 20 volts - 60 hertz - phase Blower motor full load amps 6. 8.2 8.2 Maximum overcurrent protection 5 5 5 Shipping Data lbs. - package 3 83 5 SPECIFICTIONS Gas Model No. ML80UH0P60C ML80UH35P60D Heating Model No. - Low Nox ML80UH0XP60C - - - Performance FUE 80% 80% Input - Btuh 0,000 32,000 Output - Btuh 89,000 07,000 Temperature rise range - F 25-55 30-60 Gas Manifold (in. w.g.) Nat. Gas / LPG/Propane 3.5 / 0.0 3.5 / 0.0 High Static - in. w.g. 0.50 0.50 Connections Flue connection - in. round 4 4 in. Indoor Blower Electrical Data Gas pipe size IPS /2 /2 Wheel nom. dia. x width - in. -/2 x 0 x Motor output - hp Tons of add-on cooling 4-5 4-5 ir Volume Range - cfm 355-275 380-280 Voltage 20 volts - 60 hertz - phase Blower motor full load amps 0.5 Maximum overcurrent protection 5 5 Shipping Data lbs. - package 6 74 NOTE - Filters and provisions for mounting are not furnished and must be field provided. nnual Fuel Utilization Efficiency based on DOE test procedures and according to FTC labeling regulations. Isolated combustion system rating for non-weatherized furnaces. ML80UH / Page 7

OPTIONL CCESSORIES - ORDER SEPRTELY CBINET CCESSORIES Width Models B Width Models C Width Models D Width Models Horizontal Suspension Kit - Horizontal only 5W0 5W0 5W0 5W0 Return ir Base - Upflow only 65W75 50W98 50W99 5W00 High Performance Economizer (Commercial Only) 0U53 0U53 0U53 0U53 FILTERS ir Filter and Rack Kit Horizontal (end) 87L95 87L96 87L97 87L98 NIGHT SERVICE KITS Size of filter - in. 4 x 25 x 8 x 25 x 20 x 25 x 25 x 25 x Side Return Single 44J22 44J22 44J22 44J22 Ten Pack 66K63 66K63 66K63 66K63 Size of filter - in. 6 x 25 x 6 x 25 x 6 x 25 x 6 x 25 x Night Service Kit 68W80 68W80 68W80 68W80 VENTING Vent daptor 6 in. conn. size upflow applications only 8M79 8M79 8M79 8M79 Cleanable polyurethane, frame-type filter. GS HET CCESSORIES Input High ltitude Switch Kit Natural Gas to LPG/Propane Kit LPG/Propane to Natural Gas Kit Natural Gas High ltitude Orifice Kit 0-4500 ft. 450-7500 ft. 750-0,000 ft. 0-7500 ft. 750-0,000 ft. 0-7500 ft. 750-0,000 ft. 045 No Change 80W52 80W5 K49 K44 73W8 73W37 070 No Change 80W52 80W5 K49 K44 73W8 73W37 090 No Change 80W52 80W5 K49 K44 73W8 73W37 0 No Change 80W57 80W52 K49 K44 73W8 73W37 35 No Change 80W52 80W5 K49 K44 73W8 73W37 HIGH LTITUDE DERTE NOTE - Units may be installed at altitudes up to 2000 ft. above sea level without any modifications. t altitudes above 2000 ft. units must be derated to match information in the shaded areas shown below. NOTE - This is the only permissible derate for these units. Input Gas Manifold (Outlet) in. w.g. 0-2000 Feet 200-4500 Feet 450-7500 Feet 750-0,000 ft. Minimum Natural Gas LPG/ Propane Natural Gas LPG/ Propane Natural Gas LPG/ Propane Natural Gas LPG/ Propane Line - in. w.g. Natural Gas LPG/ Propane Maximum 045 3.5 0 3.2 0 3 0 3.5 0 4.5 3 070 3.5 0 3.2 0 2.8 0 3.5 0 4.5 3 090 3.5 0 3.2 0 2.7 9.6 3.5 0 4.5 3 0 3.5 0 3.5 0 3 9.6 3.5 0 4.5 3 35 3.5 0 3.5 0 2.9 9.6 3.5 0 4.5 3 Natural Gas High ltitude Orifice Kit required. ML80UH / Page 8

INSTLLTION CLERNCES - INCHES (MM) UPFLOW POSITION Vent Type Type B Type C Sides 0 (0) 0 (0) Rear 0 (0) 0 (0) Top (25) (25) Front 2-/4 (57) 2-/4 (57) Front (service/alcove) 24 (60) 24 (60) Floor Combustible Combustible Flue (25) 6 (52) NOTE ir for combustion must conform to the methods outlined in the National Fuel Gas Code (NFP 54/NSI-Z223.). NOTE In the U.S. flue sizing must conform to the methods outlined in the current National Fuel Gas Code (NFP 54/NSI-Z223.) or applicable provisions of local building codes. Left side requires 4 in. if single wall vent is used on 4-/2 in. cabinets, 2 in. on 7-/2 in. cabinets. HORIZONTL POSITION Vent Type Type B Type C End 2 2 Rear 0 (0) 0 (0) Top 0 (0) 0 (0) Front 2-/4 (57) 2-/4 (57) Front (service) 24 (60) 24 (60) Floor Combustible Combustible Flue (25) 6 (52) NOTE ir for combustion must conform to the methods outlined in the National Fuel Gas Code (NFP 54/NSI-Z223.). NOTE In the U.S. flue sizing must conform to the methods outlined in the current National Fuel Gas Code (NFP 54/NSI-Z223.) or applicable provisions of local building codes. Line contact installation permissible between jacket top or sides and building joists. ML80UH / Page 9

DIMENSIONS - INCHES (MM) - UPFLOW POSITION NOTE - 60C and 60D size units that require air volumes over 800 cfm must have one of the following:. Single side return air and Optional Return ir Base with transition that must accommodate required 20 x 25 x inch (508 x 635 x 25 mm) air filter to maintain proper velocity. 2. Bottom return air. 3. Return air from both sides. 4. Bottom and one side return air. See Blower Performance Tables for additional information. D FLUE OUTLET (Top) 3-/8 (79) SUPPLY IR OPENING 2 Flue outlet may be horizontal but furnace must be vented vertically 3 Optional External Side Return ir Filter Kit is not for use with the optional Return ir Base. 3 OPTIONL EXTERNL SIDE RETURN IR FILTER KIT (Either Side) 23-3/4 (603) 25 (635) TOP VIEW B 9/6 (4) 3/4(9) Front Panel 3 (76) Right 6-3/4 (7) Left 3-/4 (83) 27-3/4 (705) 9-7/6 (494) 9/6 (4) 3 OPTIONL EXTERNL SIDE RETURN IR FILTER KIT (Either Side) 33 (838) 9-/8 (232) Right 8-5/8 (29) Left 5-3/8 (37) Right 2-3/6 (56) Left 2 FLUE OUTLET (Either Side) ELECTRICL INLET (Either Side) GS PIPING INLET (Either Side) 4-3/4 (375) 6 (406) ELECTRICL INLET (Either Side) 23 (584) Side Return ir Opening (Either Side) 4 (356) -/2 (38) -5/6 (49) 3/4 (9) C Bottom Return ir Opening 3/4 (9) 5/8 (6) 3-/4 (83) 23-/2 (597) Bottom Return ir Opening FRONT VIEW SIDE VIEW Model No. ML80UH045P24 ML80UH045P36 ML80UH070P24 ML80UH070P36 ML80UH090P36B ML80UH090P48B ML80UH0P48C ML80UH0P60C B C D in. mm in. mm in. mm in. mm 4-/2 368 3-3/8 340 3 330 4-3/4 2 7-/2 446 6-3/8 46 6 406 6-/4 59 2 533 9-7/8 504 9-/2 495 8 203 ML80UH35P60D 24-/2 622 23-3/8 594 23 584 9-3/4 248 ML80UH / Page 0

DIMENSIONS - INCHES (MM) - HORIZONTL POSITION Flue outlet may be from end but furnace must be vented vertically 9-/8 (232) Top 8-5/8 (29) Bottom FLUE OUTLET (Top) 3 (76) LEFT-HND IR DISCHRGE GS PIPING INLET (Top or Bottom) IR FLOW ELECTRICL INLET (Top or Bottom) 3/4 (9) Front Panel 27-3/4 (705) 9/6 (4) FLUE OUTLET (End) 6-3/4 (7) TOP VIEW 33 (838) 5-3/8 (37) Top 2-3/6 (56) Bottom 3/4 (9) 27-3/4 (705) 9/6 (4) 9-7/6 (494) SUPPLY IR OPENING B D IR FLOW 4-/4 (08) C 23-/2 (597) RETURN IR OPENING END VIEW 3-/8 (79) FRONT VIEW RIGHT-HND IR DISCHRGE END VIEW ELECTRICL INLET (Top or Bottom) IR FLOW GS PIPING INLET (Top or Bottom) 6-3/4 (7) Flue outlet may be horizontal but furnace must be vented vertically FLUE OUTLET (Top) 3/4 (9) Front Panel 3 (76) 27-3/4 (705) 2-3/6 (56) Top 5-3/8 (37) Bottom TOP VIEW 33 (838) 8-5/8 (29) Top 9-/8 (232) Bottom FLUE OUTLET (End) 27-3/4 3-/8 (705) (79) 23-/2 (597) RETURN IR OPENING C 4-/4 (08) IR FLOW D 9-7/6 (494) SUPPLY IR OPENING B 9/6 (4) END VIEW 3/4 (9) FRONT VIEW END VIEW 9/6 (4) Model No. B C D in. mm in. mm in. mm in. mm ML80UH045P24 ML80UH045P36 ML80UH070P24 4-/2 368 3-3/8 340 3 330 4-3/4 2 ML80UH070P36 ML80UH090P36B ML80UH090P48B 7-/2 446 6-3/8 46 6 406 6-/4 59 ML80UH0P48C ML80UH0P60C 2 533 9-7/8 504 9-/2 495 8 203 ML80UH35P60D 24-/2 622 23-3/8 594 23 584 9-3/4 248 ML80UH / Page

OPTIONL CCESSORY DIMENSIONS - INCHES (MM) HORIZONTL (END) FILTER KIT 5/8 (6) 24 3/4 (629) -/4 (32) 5/8 (6) B RETURN IR OPENING 23 /2 (597) 5/8 (6) IR FLOW Furnace Cabinet Width Catalog Number B in. mm in. mm 87L95 4 356 2-3/4 324 B 87L96 8 457 6-3/4 425 C 87L97 2 533 8-3/4 476 D 87L98 25 635 23-3/4 603 5/8 (6) SIDE VIEW IR FILTER (Furnished) FRONT VIEW Optional Return ir Base (Upflow pplications Only - For use with, B, C and D cabinets) FURNCE FRONT IR FLOW INDOOR IR QULITY CBINET (PCO, Filter Cabinet, etc.) IF BSE IS USED WITHOUT IQ CBINET, SINGLE RETURN IR PLENUM MUST COVER BOTH UNIT ND RETURN IR BSE OPENINGS 3-/4 (83) 7-/4 (84) 23 (584) Overall (Maximum) Unit side return air Opening 5-5/8 (43) Minimum (279) 2 Maximum 4 (356) SIDE RETURN IR OPENINGS (Either Side) 22-7/6 (570) Overall (Maximum) 4-/2 (368) Width (65W75) 7-/2 (446) B Width (50W98) 2 (533) C Width (50W99) 24-/2 (622) D Width (5W00) OPTIONL RETURN IR BSE 26-7/8 (683) 23 (584) SIDE VIEW 3/4 (9) NOTE- Optional Side Return ir Filter Kits are not for use with Optional Return ir Base. Both the unit return air opening and the base return air opening must be covered by a single plenum or IQ cabinet. Minimum unit side return air opening dimensions for units requiring 800 cfm or more of air (W x H): 23 x in. (584 x 279 mm). The opening can be cut as needed to accommodate plenum or IQ cabinet while maintaining dimensions shown. Side return air openings must be cut in the field. There are cutting guides stenciled on the cabinet for the side return air opening. The size of the opening must not extend beyond the markings on the furnace cabinet. 2 To minimize pressure drop, the largest opening height possible, up to 4 in. (356 mm), is preferred. ML80UH / Page 2

DIMENSIONS - INCHES (MM) - FURNCE/COIL COMBINED DIMENSIONS UPFLOW POSITION Model No C35/C37/CX35/CX38 Cased C35 Uncased B B C35/CX35 C37 CX38 in. mm in. mm in. mm in. mm C35/CX35-8/24 C35/CX35-8/24B C35/CX35-24 C35/CX35-24B C35/CX35-30 C35/CX35-30B C37-25 C37-25B - - - - - - 6-/2 49 49-/2 257 4-/8 359 47-/8 97 CX38-25 CX38-25B 8-/2 470 5-/2 308 6-3/8 46 49-3/8 254 - - - - - - CX38-30 20-/2 52 53-/2 359 - - - - - - - - - - - - C37-3 C37-3B C35/CX35-30/36 C37-36 C35/CX35-30/36B C37-36B C35/CX35-30/36C C37-36C C35/CX35-36 C35/CX35-36B C37-38 C37-38B CX38-3 CX38-3B CX38-36 CX38-36B CX38-36C CX38-38 CX38-38B 22-/2 572 55-/2 40 20-3/4 527 53-3/4 365 24-/2 622 57-/2 46 22-/4 565 55-/4 403 24-/2 622 57-/2 46 22-3/8 568 55-3/8 407 - - - C37-42B CX38-42B 24-/2 622 57-/2 46 - - - - - - - - - - - - C35/CX35-48B C35/CX35-48C - - - C37-43B C37-43C C37-48B C37-48C CX38-43B CX38-43C CX38-44/48B CX38-44/48C 27-/2 699 60-/2 537 26-/4 667 59-/4 505 24-/2 622 57-/2 46 - - - - - - - - - - - - C35/CX35-49C C37-49C CX38-49C 29-/2 749 62-/2 588 28-/2 724 6-/2 562 C35/CX35-50/60C C37-50/60C CX38-50/60C 27-/2 699 60-/2 537 25-7/8 657 58-7/8 495 - - - C37-60D CX38-60D 25-/2 648 58-/2 486 - - - - - - - - - - - - CX35-60C C37-62C CX38-62C 3-/2 800 64-/2 638 30-5/8 778 63-5/8 66 CX35-60D C37-62D CX38-62D 29-/2 749 62-/2 588 28 7 6 549 33 (838) B B 33 (838) HORIZONTL POSITION Model B Number in. mm in. mm CH33 CH33-8-2F 2-/2 546 54-/2 384 CH33-24/30-2F, CH33-42B-2F, 26-/2 673 59-/2 5 CH33-36-2F, CH33-36B-2F, CH33-48C-2F, CH33-60D-2F CH33-36C-2F, CH33-44/48B-2F, CH33-62D-2F 3-/2 800 64-/2 638 CH33-50/60C-2F, CH35 CH35-8-2F, CH35-24-2F, CH35-24B-2F, CH35-30B-2F, CH35-30-2F, CH35-42B-2F, CH35-48B-2F, CH35-36-2F, CH35-36B-2F, CH35-36C-2F, CH35-42C-2F, CH35-48C-2F CH35-5C-2F, CH35-60D-2F 26-/2 673 59-/2 5 3-/2 880 64-/2 638 ML80UH / Page 3

BLOWER DT ML80UH045P24 PERFORMNCE (Less Filter) External ir Volume / Watts at Various Blower Speeds Static Medium- Medium- High Low High Low in. w.g. cfm Watts cfm Watts cfm Watts cfm Watts 0.00 30 453 900 328 750 26 680 237 0.0 5 432 885 32 735 255 670 230 0.20 00 43 870 35 720 249 655 223 0.30 070 396 855 304 700 24 640 27 0.40 030 375 830 294 685 234 620 209 0.50 990 356 800 283 655 223 590 200 0.60 930 335 750 26 60 207 535 86 0.70 870 35 705 245 540 93 490 75 0.80 785 285 65 223 455 75 405 58 0.90 65 247 485 96 375 57 345 43 ML80UH070P36 PERFORMNCE (Less Filter) External ir Volume / Watts at Various Blower Speeds Static Medium- Medium- High Low High Low in. w.g. cfm Watts cfm Watts cfm Watts cfm Watts 0.00 660 696 370 604 095 495 935 386 0.0 620 658 365 568 5 468 945 374 0.20 580 62 355 535 35 442 960 362 0.30 520 595 335 53 30 423 955 350 0.40 480 562 300 478 00 403 945 335 0.50 400 520 270 450 080 382 925 320 0.60 340 490 205 420 035 358 880 30 0.70 245 458 25 393 975 333 835 282 0.80 60 434 045 364 95 30 775 262 0.90 045 393 940 334 830 283 785 268 ML80UH045P36 PERFORMNCE (Less Filter) External ir Volume / Watts at Various Blower Speeds Static Medium- Medium- High Low High Low in. w.g. cfm Watts cfm Watts cfm Watts cfm Watts 0.00 670 7 335 64 40 485 925 388 0.0 620 663 335 577 30 470 940 376 0.20 570 69 330 543 5 455 950 366 0.30 525 598 35 5 40 432 950 349 0.40 470 552 275 49 25 43 945 336 0.50 400 525 235 455 085 384 925 37 0.60 330 486 85 422 050 36 885 300 0.70 225 450 35 395 995 336 840 283 0.80 35 48 00 359 925 35 785 258 0.90 020 388 930 329 820 278 650 227 ML80UH090P36B PERFORMNCE (Less Filter) External ir Volume / Watts at Various Blower Speeds Static Medium- Medium- High Low High Low in. w.g. cfm Watts cfm Watts cfm Watts cfm Watts 0.00 795 78 450 606 95 464 970 390 0.0 760 730 435 576 85 452 970 378 0.20 725 683 420 547 70 440 975 368 0.30 685 656 40 525 70 420 980 356 0.40 630 625 370 50 50 400 955 340 0.50 535 569 35 469 25 39 925 326 0.60 470 533 275 440 085 367 90 309 0.70 365 490 85 407 020 344 840 290 0.80 255 466 05 380 935 34 785 266 0.90 60 430 000 352 85 285 680 258 ML80UH070P24 PERFORMNCE (Less Filter) External ir Volume / Watts at Various Blower Speeds Static High Medium Low in. w.g. cfm Watts cfm Watts cfm Watts 0.00 60 450 005 380 865 309 0.0 35 439 990 369 845 299 0.20 5 429 975 358 820 289 0.30 085 40 955 348 790 279 0.40 045 389 925 335 775 270 0.50 05 374 885 32 735 260 0.60 965 358 835 307 700 248 0.70 890 335 780 289 635 232 0.80 80 35 700 268 560 24 0.90 75 289 565 238 420 89 ML80UH090P48B PERFORMNCE (Less Filter) External ir Volume / Watts at Various Blower Speeds Static Medium- Medium- High Low High Low in. w.g. cfm Watts cfm Watts cfm Watts cfm Watts 0.00 260 873 825 775 55 649 260 544 0.0 2030 804 780 79 525 63 280 58 0.20 90 740 740 666 535 580 305 493 0.30 840 698 705 643 500 55 305 474 0.40 770 664 635 594 460 57 280 445 0.50 665 625 560 567 40 483 225 420 0.60 585 595 470 523 330 45 90 39 0.70 470 56 365 483 260 42 5 368 0.80 355 54 230 433 55 392 020 338 0.90 200 47 20 399 020 345 920 35 ML80UH / Page 4

BLOWER DT ML80UH0P48C PERFORMNCE (Less Filter) External ir Volume / Watts at Various Blower Speeds Static Medium- Medium- High Low High Low in. w.g. cfm Watts cfm Watts cfm Watts cfm Watts 0.00 270 980 845 792 565 678 270 564 0.0 225 99 820 747 555 648 300 540 0.20 2080 862 790 705 540 69 335 56 0.30 205 807 745 652 545 587 335 498 0.40 940 748 695 629 505 552 320 470 0.50 850 76 635 58 470 523 295 449 0.60 775 679 575 560 395 484 235 47 0.70 680 637 470 508 320 450 70 387 0.80 560 592 350 469 205 404 050 345 0.90 425 546 90 424 060 362 90 307 ML80UH0P60C PERFORMNCE (Less Filter) ir Volume / Watts at Different Blower Speeds Single Side Return ir ir volumes in bold require External Bottom Return ir, Side Return ir from Both Sides or Optional Return ir Base and field fabricated transition to Static Return ir from Bottom and One Side. accommodate 20 x 25 x in. air filter in order to maintain proper air velocity. in. w.g. High Medium-High Medium-Low Low High Medium-High Medium-Low Low cfm Watts cfm Watts cfm Watts cfm Watts cfm Watts cfm Watts cfm Watts cfm Watts 0.00 2575 39 2270 050 845 860 430 66 275 509 275 03 695 858 40 653 0.0 2520 359 2250 034 860 84 455 654 2605 454 260 060 740 848 430 65 0.20 2465 329 2230 08 870 823 480 647 2505 40 250 08 785 838 450 649 0.30 2385 307 280 98 885 809 540 646 2435 349 25 99 795 88 485 638 0.40 2295 256 205 942 865 778 570 638 2350 308 2070 965 805 80 480 63 0.50 2200 24 2055 909 845 762 570 69 2260 274 200 929 785 775 480 62 0.60 230 86 985 882 795 74 550 604 275 228 955 90 755 752 490 6 0.70 205 50 890 848 720 7 505 580 2085 86 850 853 70 722 460 594 0.80 905 05 80 85 675 687 470 565 965 47 785 88 640 689 425 567 0.90 795 054 70 779 545 647 375 533 830 094 700 794 555 662 355 545 ML80UH35P60D PERFORMNCE (Less Filter) ir Volume / Watts at Different Blower Speeds Single Side Return ir ir volumes in bold require External Bottom Return ir, Side Return ir from Both Sides or Optional Return ir Base and field fabricated transition to Static Return ir from Bottom and One Side. accommodate 20 x 25 x in. air filter in order to maintain proper air velocity. in. w.g. High Medium-High Medium-Low Low High Medium-High Medium-Low Low cfm Watts cfm Watts cfm Watts cfm Watts cfm Watts cfm Watts cfm Watts cfm Watts 0.00 2785 492 2205 083 665 840 345 632 280 528 285 00 705 835 260 622 0.0 2750 44 2220 056 725 825 395 625 2725 463 280 075 75 827 320 624 0.20 2720 392 2235 029 785 80 445 68 2640 400 280 05 720 89 380 626 0.30 2605 362 2220 002 820 800 460 623 2575 374 265 005 790 803 420 622 0.40 2495 32 285 968 845 779 485 66 2495 343 245 988 775 79 450 67 0.50 2420 275 235 939 825 767 505 605 2405 292 205 948 780 777 470 60 0.60 2335 234 2080 909 825 753 495 593 2305 257 2045 94 775 753 480 593 0.70 2220 90 995 864 760 76 475 576 225 24 970 884 740 727 455 583 0.80 220 57 890 835 680 686 435 558 20 70 890 85 675 699 430 565 0.90 985 02 790 794 605 656 390 536 985 22 790 8 600 667 380 543 ML80UH / Page 5

REVISIONS Sections Furnace/Coil Combined Dimensions Blower Data Optional ccessories Description of Change Updated to reflect latest coil offering. Blower Data for C and D Width Cabinets Updated Single Side Return ir requirements to include required Optional Return ir Base. Removed Universal Service Kit - Discontinued. Visit us at www.lennox.com For the latest technical information, www.lennoxpros.com Contact us at -800-4-LENNOX NOTE - Due to Lennox ongoing commitment to quality, Specifications, Ratings and Dimensions subject to change without notice and without incurring liability. Improper installation, adjustment, alteration, service or maintenance can cause property damage or personal injury. Installation and service must be performed by a qualified installer and servicing agency. 208 Lennox Industries, Inc.