Manuals / Lennox International Inc / Household Appliance / Gas Heater

Lennox International Inc Importan T, ML193UH with Evaporator Coil Using a Common Drain

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

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Drain Connection

ML193UH with Evaporator Coil Using a Separate Drain

(Unit shown in horizontal left-hand discharge position)

Evaporator

Coil

4”min

5”max

5’ max.

PVC Pipe Only

Field Provided Vent

(4” min. to 5” max. above condensate connection)

		Condensate
		Drain Connection
Drain Pan	(Trap at coil is optional)	*Piping from furnace and evaporator coil must
		slope down a minimum 1/4” per ft. toward trap
		FIGURE 51	.
			.

ML193UH with Evaporator

Coil Using a Common Drain

Evaporator drain

line required

(Trap at coil is optional)

(1” min. to 2” Max.above condensate drain connection)

Condensate

DrainConnection

IMPORTAN

T

When combining the furnace and evaporator coil drains together, the A/C condensate drain outlet must be vented to relieve pressure in or der for the furnace pressure switch to operate properly.

FIGURE 52

ML193UH with Evaporator Coil Using a Common Drain

(Unit shown in horizontal left−hand discharge position)

Evaporator

Coil

(Trap at coil is optional)

Drain Pan

4”min

5”max

5’ max.

PVC Pipe Only

Condensate

Drain Connection

*Piping from furnace and evaporator coil must slope down a minimum 1/4” per ft. toward trap

(4” min. to 5” Max.above condensate drain connection)

FIGURE 53

Page 32

Image 32

Lennox International Inc Importan T, ML193UH with Evaporator Coil Using a Common Drain, Drain Connection

Contents

Table of Contents INSTALLATION INSTRUCTIONS ML193UH2P0813 P507121-01ML193UH Unit Dimensions - inches mm SUPPLY AIROPENING ML193UHSafety Information DANGERML193UH Gas Furnace Shipping and Packing ListUse of Furnace as Construction Heater Installation LocationsInstalled in Combination with a Cooling Coil General Combustion, Dilution & Ventilation AirUnconfined Space Confined SpaceAir from Inside Air from Outside Installation - Setting Equipment Shipping Bolt RemovalUpflow Applications ML193UH090P48CSETTING EQUIPMENT UPFLOW APPLICA TIONHORIZONTAL APPLICATION FRONT VIEWReturn Air Guidelines Side Return Air with transition and filterHorizontal Applications Optional Return Air BaseUpflow Applications Only Removing the Bottom PanelHorizontal Application Installation Clearances FIGURE Suspended Installation of Horizontal UnitPlatform Installation of Horizontal Unit HORIZONTAL SUSPENSION KITPipe & Fittings Specifications FiltersDuct System FIGURE Return Air --Horizontal ApplicationsTABLE PIPING AND FITTINGS SPECIFICATIONS Joint Cementing Procedure TABLE OUTDOOR TERMINATION USAGEDANGER DANGER OF EXPLOSIONVenting Practices Piping Suspension GuidelinesWall Thickness Guidelines FIGURE Exhaust Piping Figures 24 andVent Piping Guidelines Exhaust PipePiping Size Process FIGURE TABLE MINIMUM VENT PIPE LENGTHSAttic or Crawl Space For Intake Air in Feet Standard Termination at Elevation 0 - 10,000Number Of 2” PipeNON-DIRECTVENT APPLICATIONS NON-DIRECTVENT APPLICATIONSPipe size determined in table RIGHT HAND DISCHARGE SHOWNRIGHT HAND DISCHARGE SHOWN APPLICATIONSPipe size determined in table TYPICAL AIR INTAKE PIPE CONNECTIONS Intake PipingTYPICAL AIR INTAKE PIPE CONNECTIONS General Guidelines for Vent Terminations For Canadian Installations OnlyTemperatures1 F C Winter DesignVent Pipe Unit Input SizeVENT TERMINATION CLEARANCES INSIDE CORNER DETAILVENT TERMINATION CLEARANCES INSIDE CORNER DETAILFIGURE Exiting Exhaust and Intake Vent different pressure zonesFIGURE Exiting Exhaust and Intake Vent different pressure zonesSide View FIELD FABRICATED WALL TERMINATION USING EXISTING CHIMNEY ML193UH DIRECT VENT APPLICATIONML193UH NON-DIRECTVENT APPLICATION FIGURE Condensate PipingField Provided Drain Components Coil Using A Separate Drain Condensate Trap With Optional Overflow SwitchTo Drain FIGURE ML193UH With EvaporatorML193UH with Evaporator Coil Using a Common Drain IMPORTAN TML193UH with Evaporator Coil Using a Common Drain Drain Connection3/4 inch TRAP / DRAIN ASSEMBLY USING 1/2” PVC OR 3/4” PVC1/2 inch LOW INLET PRESSURE SWITCH Gas PipingS145 LOCATION Leak CheckPossible Gas Piping Configurations Horizontal ApplicationsLeft Side Piping Standard Right Side Piping AlternateCARBON MONOXIDE POISONING HAZARD TABLE GAS PIPE CAPACITY - FT3/HR kL/HRRemoval of the Furnace from Common Vent Precautions and Procedures INTERIOR MAKE-UPBOX INSTALLATIONAccessory Terminals ElectricalTYPICAL ML193UH WIRING DIAGRAM Generator Use - Voltage RequirementsIntegrated Control Diagnostic Codes DIAGNOSTIC CODESIntegrated Control INTEGRATED CONTROLUnit Start-Up Placing the furnace into operationPriming Condensate Trap Gas Valve Operation FigureGas Pressure Adjustment GAS METER CLOCKING CHARTFailure To Operate Heating Sequence Of OperationProper Combustion High Altitude InformationML193 UnitCARBON MONOXIDE POISONING HAZARD Other Unit Adjustments Flame Rollout Switches TwoPressure Switch Temperature RiseTwinning the ML193UH FIELD WIRING FOR TWINNINGService Cleaning the Burner AssemblyBlower FiltersRepair Parts List Cabinet PartsHeating Parts Control Panel PartsStart-Up& Performance Check List UNIT SET UP Terminations Installed ProperlyHeat Cable Installed and Operable if applicable RETURN DUCT Sealed Filter Installed and CleanTEMPERATURE DROP Return Duct TemperatureSupply Duct Temperature TEMPERATURE RISERequirements for Commonwealth of Massachusetts Modifications to NFPA-54,ChapterEXEMPTIONS The following equipment is exempt from 24 CMR 5.082a 1 throughPage