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Lennox International Inc Lennox Merit Series Gas Furnace Upflow/Horizontal Air Discharge, ML193UH

Models: Lennox Merit Series Gas Furnace Upflow/Horizontal Air Discharge ML193UH

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Image 35

Left Side Piping

(Standard)

AUTOMATIC GAS VALVE (with manual

Right Side Piping

(Alternate)

MANUAL

MAIN SHUT-OFF

VALVE

GROUND

JOINT

UNION

shut-off valve)

Gas Valve

Plug

Gas Valve

Bellows Grommet

MANUAL

MAIN SHUT-OFF

VALVE

GROUND

JOINT

UNION

DRIP LEG

Bellows Grommet

FIELD

PROVIDED

AND INSTALLED

NOTE - BLACK IRON PIPE ONLY TO BE ROUTED INSIDE OF CABINET
FIGURE 57
Horizontal Applications
Possible Gas Piping Configurations
	MANUAL
	MAIN SHUT-OFF
MANUAL	VALVE	Horizontal Application
MANUAL		Left-Side Air Discharge
MAIN SHUT-OFF		Left-Side Air Discharge
VALVE
	GROUND
	JOINT
	UNION
GROUND		Bellows Grommet
JOINT	DRIP LEG
UNION
Bellows Grommet
DRIP LEG
		Gas Valve
Horizontal Application		MANUAL
Right-Side Air Discharge		MANUAL
Right-Side Air Discharge		MAIN SHUT-OFF
		VALVE
Gas Valve		GROUND
		GROUND
FIELD	Bellows Grommet	JOINT
PROVIDED		UNION
PROVIDED
AND INSTALLED

Plug	NOTE - BLACK IRON PIPE ONLY TO BE ROUTED INSIDE OF CABINET	DRIP LEG

FIGURE 58

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Image 35

Lennox International Inc Lennox Merit Series Gas Furnace Upflow/Horizontal Air Discharge, ML193UH Horizontal Applications

Contents

P507121-01 Table of ContentsINSTALLATION INSTRUCTIONS ML193UH 2P0813ML193UH ML193UH Unit Dimensions - inches mmSUPPLY AIR OPENINGShipping and Packing List Safety InformationDANGER ML193UH Gas FurnaceUse of Furnace as Construction Heater Installation LocationsInstalled in Combination with a Cooling Coil Combustion, Dilution & Ventilation Air GeneralUnconfined Space Confined SpaceAir from Inside Air from Outside ML193UH090P48C Installation - Setting EquipmentShipping Bolt Removal Upflow ApplicationsFRONT VIEW SETTING EQUIPMENTUPFLOW APPLICA TION HORIZONTAL APPLICATIONSide Return Air with transition and filter Return Air GuidelinesRemoving the Bottom Panel Horizontal ApplicationsOptional Return Air Base Upflow Applications OnlyHORIZONTAL SUSPENSION KIT Horizontal Application Installation ClearancesFIGURE Suspended Installation of Horizontal Unit Platform Installation of Horizontal UnitFIGURE Return Air --Horizontal Applications Pipe & Fittings SpecificationsFilters Duct SystemTABLE PIPING AND FITTINGS SPECIFICATIONS DANGER OF EXPLOSION Joint Cementing ProcedureTABLE OUTDOOR TERMINATION USAGE DANGERFIGURE Exhaust Piping Figures 24 and Venting PracticesPiping Suspension Guidelines Wall Thickness GuidelinesFIGURE TABLE MINIMUM VENT PIPE LENGTHS Vent Piping GuidelinesExhaust Pipe Piping Size Process2” Pipe Attic or Crawl Space For Intake Air in FeetStandard Termination at Elevation 0 - 10,000 Number OfRIGHT HAND DISCHARGE SHOWN NON-DIRECTVENT APPLICATIONSNON-DIRECTVENT APPLICATIONS Pipe size determined in tableRIGHT HAND DISCHARGE SHOWN APPLICATIONSPipe size determined in table TYPICAL AIR INTAKE PIPE CONNECTIONS Intake PipingTYPICAL AIR INTAKE PIPE CONNECTIONS For Canadian Installations Only General Guidelines for Vent TerminationsTemperatures1 F C Winter DesignVent Pipe Unit Input SizeINSIDE CORNER DETAIL VENT TERMINATION CLEARANCESINSIDE CORNER DETAIL VENT TERMINATION CLEARANCESdifferent pressure zones FIGURE Exiting Exhaust and Intake Ventdifferent pressure zones FIGURE Exiting Exhaust and Intake VentSide View FIELD FABRICATED WALL TERMINATION FIGURE Condensate Piping USING EXISTING CHIMNEYML193UH DIRECT VENT APPLICATION ML193UH NON-DIRECTVENT APPLICATIONField Provided Drain Components FIGURE ML193UH With Evaporator Coil Using A Separate DrainCondensate Trap With Optional Overflow Switch To DrainDrain Connection ML193UH with Evaporator Coil Using a Common DrainIMPORTAN T ML193UH with Evaporator Coil Using a Common Drain3/4 inch TRAP / DRAIN ASSEMBLY USING 1/2” PVC OR 3/4” PVC1/2 inch Leak Check LOW INLET PRESSURE SWITCHGas Piping S145 LOCATIONRight Side Piping Alternate Possible Gas Piping ConfigurationsHorizontal Applications Left Side Piping StandardCARBON MONOXIDE POISONING HAZARD TABLE GAS PIPE CAPACITY - FT3/HR kL/HRRemoval of the Furnace from Common Vent Electrical Precautions and ProceduresINTERIOR MAKE-UPBOX INSTALLATION Accessory TerminalsGenerator Use - Voltage Requirements TYPICAL ML193UH WIRING DIAGRAMINTEGRATED CONTROL Integrated Control Diagnostic CodesDIAGNOSTIC CODES Integrated ControlGas Valve Operation Figure Unit Start-UpPlacing the furnace into operation Priming Condensate TrapHeating Sequence Of Operation Gas Pressure AdjustmentGAS METER CLOCKING CHART Failure To OperateUnit Proper CombustionHigh Altitude Information ML193CARBON MONOXIDE POISONING HAZARD Primary Limit Other Unit AdjustmentsFlame Rollout Switches Two Pressure SwitchFIELD WIRING FOR TWINNING Twinning the ML193UHFilters ServiceCleaning the Burner Assembly BlowerControl Panel Parts Repair Parts ListCabinet Parts Heating PartsRETURN DUCT Sealed Filter Installed and Clean Start-Up& Performance Check List UNIT SET UPTerminations Installed Properly Heat Cable Installed and Operable if applicableCOOLING MODE Adjusted and ProgrammedUNIT OPERATION HEATING MODEfrom 24 CMR 5.082a 1 through Requirements for Commonwealth of MassachusettsModifications to NFPA-54,Chapter EXEMPTIONS The following equipment is exemptPage

Left Side Piping

Right Side Piping

Horizontal Applications

Possible Gas Piping Configurations

Horizontal Application

Left-Side Air Discharge

Right-Side Air Discharge