Benutzeranleitung / Produktwartung Lennox Merit Series Gas Furnace Upflow/Horizontal Air Discharge des Produzenten Lennox International Inc.
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Page 1 08/13 *2P0813* 507121-01 *P507121-01* E 2013 Lennox Industries Inc. Dallas, Texas, USA AIR FLOW UPFLOW AIR FLOW AIR FLOW HORIZONTAL RIGHT HORIZONTAL LEFT INSTALLATION INSTRUCTIONS ML193UH MERIT.
Page 2 ML193UH Unit Dimensions - inches (mm) 6−9/16 (167) Left 9 (229) Right 23 (584) (19) 3/4 (19) 1 Bottom Return Air Opening GAS PIPING INLET (Either Side) Side Return Air Opening (Either Side) 1.
P age 3 ML193UH Gas Furnace The ML193UH Category IV gas furnace is shipped ready for installation in the upflow or horizontal position. The fur nace is shipped with the bottom panel in place. The bottom panel must be removed if the unit is to be installed in hori zontal or upflow applications with bottom return air.
Page 4 Gas Code is available from the following address: American National Standards Institute, Inc. 11 West 42nd Street New York, NY 10036 In Canada, installation must conform with current National Standard of Canada CSA‐B149 Natural Gas and Propane Installation Codes, local plumbing or waste water codes and other applicable local codes.
P age 5 D Air filters must be replaced upon construction comple tion. D The input rate and temperature rise must be set per the furnace rating plate. D One hundred percent (100%) outdoor air must be pro vided for combustion air requirements during construc tion.
Page 6 will build to the point that a downdraft can occur in the fur nace vent pipe or chimney. As a result, combustion gases enter the living space creating a potentially dangerous situ ation.
P age 7 Air from Outside If air from outside is brought in for combustion and ventila tion, the confined space shall be provi ded with two perma nent openings. One opening shall be within 12” (305mm) of th e top of the enclosure and one within 12” (305mm) of the bottom.
Page 8 FIGURE 8 EQUIPMENT IN CONFINED SPACE - ALL AIR FROM OUTSIDE (All Air Through Ventilated Attic) NOTE -The inlet and outlet air openings shall each have a free area of at least one square inch per 4,000 Btu (645mm 2 p er 1.17kW) per hour of the total input rating of all equipment in the enclosure.
P age 9 FIGURE 11 SETTING EQUIPMENT UPFLOW APPLICA TION HORIZONTAL APPLICATION FRONT VIEW SIDE VIEW FRONT VIEW END VIEW UNIT FRONT AIR FLOW UNIT FRONT 1/2” max. 1/2” max. AIR FLOW AIR FLOW SIDE VIEW UNIT FRONT Unit must be level side-to-side. Unit may be positioned from level to 1/2” toward the front to aid in draining.
Page 10 WARNING Improper installation of the furnace can result in per sonal injury or death. Combustion and flue products mus t never be allowed to enter the return air system or air in th e living space. Use sheet metal screws and joint tape to seal return air system to furnace.
P age 11 FIGURE 14 Optional Return Air Base (Upflow Applications Only) NOTE- Optional side return air filter kits are not for use with return air base. 1 Both the unit return air opening and the base return air opening must be covered by a single plenum or IAQ cabinet.
Page 12 The ML193UH furnace can be installed in horizontal ap plications with either right- or left-hand air discharge. Refer to fig ure 17 for clearances in horizontal applications.
P age 13 FIGURE 19 *GAS CONNECTION RAISED PLA TFORM SERVICE PLA TFORM INT AKE PIPE EXHAUST PIPE Return Air -- Horizontal Applications Return air may be brought in only through the end of a fur nace installed in the horizontal position. The furnace is equipped with a removable bottom panel to facilitate instal lation.
Page 14 CAUTION Solvent cements for plastic pipe are flammable liq uids and should be kept away from all sources of ignition. Do not use excessive amounts of solvent ce me nt when making joints. Good ventilation should be maintained to reduce fire hazard and to minimize breathing of solvent vapors.
P age 15 TABLE 3 OUTDOOR TERMINATION USAGE* Input Size Vent Pipe Dia. in. STANDARD CONCENTRIC Flush Mount Kit Wall Kit Wall Ring Kit Field Fabricated 1-1/2 inch 2 inch 3 inch 2 inch 3 inch 2 inch 5.
Page 16 NOTE - Assembly should be completed within 20 sec onds after last application of cement. Hammer blows should not be used when inserting pipe. 8 - After assembly, wipe excess cement from pipe at end of fitting socket. A properly made joint will show a bead around its entire perimeter.
P age 17 Vent Piping Guidelines The ML193UH can be installed as either a Non-Direct Vent or a Direct Vent gas central furnace. NOTE - In Non‐Direct Vent installations, combustion air is taken from indoors and flue gases are discharged out doors.
Page 18 TABLE 5 Maximum Allowable Intake or Exhaust Vent Length in Feet NOTE - Size intake and exhaust pipe length separately. Values in table are for Intake OR Exhaust, not combined total.
P age 19 FIGURE 24 TYPICAL EXHAUST PIPE CONNECTIONS IN UPFLOW DIRECT OR NON-DIRECT VENT APPLICATIONS TRANSITION 2” 2” 2” 3” 2” 2” or Pipe size determined in table 5 DO NOT transition from smaller to larger pipe in horizontal runs of exhaust pipe.
Page 20 FIGURE 26 TYPICAL AIR INTAKE PIPE CONNECTIONS IN UPFLOW DIRECT VENT APPLICATIONS *2” TRANSITION 2” 3” Pipe size determined in table 5 2” 2” 2” 2” or AIR INTAKE * When transitioning up in pipe size, use the shortest length of 2” PVC pipe possible.
P age 21 Intake Piping The ML193UH furnace may be installed in either direct vent or non-direct vent applications. In non-direct vent applications, when intake air will be drawn into the furnace from .
Page 22 CAUTION If this unit is being installed in an application with combustion air coming in from a space serviced by an exhaust fan, power exhaust fan, or other device which may create a negative pressure in the space, take care when sizing the inlet air opening.
P age 23 TABLE 7 Maximum Allowable Exhaust Vent Pipe Length (in ft.) Without Insulation In Unconditioned Space For Winter Design Temperatures Single - Stage High Efficiency Furnace Winter Design Temperatures 1 °F (°C) Vent Pipe Diameter Unit Input Size 045 070 090 110 135 32 to 21 (0 to -6) PVC PVC PVC PVC PVC 2 in.
Page 24 FIGURE 33 ** VENT TERMINATION CLEARANCES FOR NON-DIRECT VENT INSTALLATIONS IN THE USA AND CANADA K D E L B C F G A B J A M I H INSIDE CORNER DETAIL VENT TERMINAL AIR SUPPLY INLET AREA WHERE TE.
P age 25 FIGURE 34 VENT TERMINATION CLEARANCES FOR DIRECT VENT INSTALLATIONS IN THE USA AND CANADA K D E L B C F G A B J A M I H INSIDE CORNER DETAIL VENT TERMINAL AIR SUPPLY INLET AREA WHERE TERMINAL.
Page 26 Details of Intake and Exhaust Piping Terminations for Direct Vent Installations NOTE - In Direct Vent installations, combustion air is taken from outdoors and flue gases are discharged to outdoors. NOTE - Flue gas may be slightly acidic and may adversely affect some building materials.
P age 27 7 - If intake and exhaust piping must be run up a si de wall to position above snow accumulation or other ob structions, piping must be supported. At least one bracket must be used within 6” from the top of the el bow and then every 24” (610mm) as shown in figure 42, to prevent any movement in any direction.
Page 28 FIGURE 42 * Use wall support every 24” (610 mm). Use two wall supports if extension is greater than 24” (610 mm) but less than 48” (1219 mm). NOTE − One wall support must be within 6” (152 mm) from top of each pipe (intake and exhaust) to prevent movement in any direction.
P age 29 ML193UH DIRECT VENT APPLICATION USING EXISTING CHIMNEY NOTE - Do not discharge exhaust gases directly into any chimney or vent stack. If ver tical discharge through an existing unused chimney or stack is required, insert piping inside chimney until the pipe open end is above top of chimney and terminate as illus trated.
Page 30 NOTE - If necessary the condensate trap may be installed up to 5’ away from the furnace. Use PVC pipe to connect trap to furnace condensate outlet.
P age 31 FIGURE 48 (Unit shown in upflow position with remote trap) *5’ max. T o Drai n PV C Pipe Only Field Provided V ent Min. 1” Above Condensate Drain Connection 1” Min. 2” Max. CONDENSATE TRAP LOCA TIONS *Piping from furnace must slope down a minimum of 1/4” per ft.
Page 32 FIGURE 51 ML193UH with Evaporator Coil Using a Separate Drain (Unit shown in horizontal left-hand discharge position) . 5’ max. PVC Pipe Only 4”min 5”max Evaporator Coil Drain Pan Condensate Drain Connection Field Provided Vent (4” min.
P age 33 FIGURE 54 Drain T rap Assembly (Furnished) V ent Drain T rap Clean Out 5 Feet Maximum Coupling 3/4 inch slip X slip (Not Furnished) 90 ° Elbow 3/4 inch PVC (Not Furnished) 3/4 inch PVC Pipe .
Page 34 Gas Piping CAUTION If a flexible gas connector is required or allowed by the authority that has jurisdiction, black iron pipe shall be installed at the gas valve and extend outside the furnace cabinet. The flexible connector can then be added between the black iron pipe and the gas supply line.
P age 35 GROUND JOINT UNION AUTOMATIC GAS VALVE (with manual shut-off valve) FIELD PROVIDED AND INSTALLED Left Side Piping (Standard) DRIP LEG MANUAL MAIN SHUT-OFF VALVE Right Side Piping (Alternate) .
Page 36 TABLE 9 GAS PIPE CAPACITY - FT 3 /HR (kL/HR) Nominal Iron Pipe Size -Inches(mm) Internal Diameter -Inches(mm) Length of Pipe-Feet(m) 10 (3.048) 20 (6.096) 30 (9.144) 40 (12.192) 50 (15.240) 60 (18.288) 70 (21.336) 80 (24.384) 90 (27.432) 100 (30.
P age 37 Electrical ELECTROSTATIC DISCHARGE (ESD) Precautions and Procedures CAUTION Electrostatic discharge can affect elec tronic components. Take precautions to neutralize electrostatic charge by touching your hand and tools to metal prior to handling the control.
Page 38 Generator Use - Voltage Requirements The following requirements must be kept in mind when specifying a generator for use with this equipment: D The furnace requires 120 volts + 10% (Range: 108.
P age 39 Integrated Control FIGURE 1 INTEGRATED CONTROL (Automatic Hot Surface Ignition System) BLOWER OFF DELAY JUMPER PUSH BUTTON LED TWIN TERMINAL DESIGNA TIONS HUM LINE XFMR EAC COOL HEAT PARK CON.
Page 40 Unit Start-Up FOR YOUR SAFETY READ BEFORE OPERATING WARNING Do not use this furnace if any part has been under water. A flood-damaged furnace is extremely dan gerous.
P age 41 4 - Move gas valve switch to OFF. 5 - Replace the upper access panel. Failure To Operate If the unit fails to operate, check the following: 1 - Is the thermostat calling for heat? 2 - Are acc.
Page 42 Proper Combustion Furnace should operate minimum 15 minutes with correct manifold pressure and gas flow rate before checking com bustion. Take combustion sample beyond the flue outlet and compare to the tables below. TABLE 12 ML193 Unit CO 2 % For Nat CO 2 % For L.
P age 43 Testing for Proper Venting and Sufficient Combustion Air for Non-Direct Vent Applications WARNING CARBON MONOXIDE POISONING HAZARD! Failure to follow the steps outlined below for each appliance connected to the venting system being placed into operation could result in carbon monox ide poisoning or death.
Page 44 Other Unit Adjustments Primary Limit . The primary limit is located on the heating compartment vestibule panel. This limit is factory set and requires no ad justment. Flame Rollout Switches (Two) These manually reset switches are located on the front of the burner box.
P age 45 Twinning the ML193UH The control board in this furnace is equipped with a provi sion to ”t w in” (interconnect) two(2) adjacent furnaces with a common plenum such that they operate as one (1) large unit. When twinned, the circulating blower speeds are synchro nized between the furnaces.
Page 46 Service WARNING ELECTRICAL SHOCK, FIRE, OR EXPLOSION HAZARD. Failure to follow safety warnings exactly could result in dangerous operation, serious injury, death or property damage. Improper servicing could result in dangerous opera tion, serious injury, death, or property damage.
P age 47 Repair Parts List The following repair parts are available through Lennox dealers. When ordering parts, include the complete furnace model num be r listed on the CSA nameplate -- Example: ML193UH045XP36B-01. All service must be performed by a licensed professional installer (or equivalent), service agency, or gas supplier.
Page 48 Start-Up & Performance Check List Gas Supply Pressure SUPPL Y AIR Line V oltage GAS SUPPLY Natural Gas LP Propane Gas Piping Connections Tight Leak Tested Supply Line Pressure “W.
P age 49 Contractor's: Name_________________________Telephone_____________Checklist Completed____________________ Job Address_____-________________________________Technician's Name___________________________________ 1 HEATING MODE GAS MANIFOLD PRESSURE “W.
Page 50 Requirements for Commonwealth of Massachusetts Modifications to NFPA-54, Chapter 10 Revise NFPA-54 section 10.8.3 to add the following re quirements: Fo r all side wall, horizontally vente.
P age 51 FOR THE PROVINCE OF ONTARIO, HORIZONTAL SIDEWALL VENT APPLICATIONS ONLY For exterior horizontal venting applications, the 2” X 1.5” reducer for 2” venting at the point where the exhaust pipe exits th e st ruc tur e i s no t r equired in direct or nondirect vent applications in the Province of Ontario.
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