Lennox International Inc MERIT SERIES GAS FURNACE DOWNFLOW AIR DISCHARGE, ML193DF Side View

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TABLE 2

COMBUSTIBLE FLOORING BASE OPENING SIZE

	Cabinet	Catalog	Front to Rear		Side to Side
	Cabinet	Catalog
	Width	Number	in.	mm	in.	mm
			in.	mm	in.	mm

	B Cabinet	11M60	22	559	18 − 3/4	476
	(17.5")	11M60	22	559	18 − 3/4	476
	(17.5")

	C Cabinet	11M61	22	559	22 − 3/4	578
	(21")	11M61	22	559	22 − 3/4	578
	(21")

FURNACE

	COOLING COIL
PROPERLY
SIZED FLOOR
OPENING	PLENUM

FURNACE

PROPERLY SIZED FLOOR OPENING

SUPPLY AIR

PLENUM

COMBUSTIBLE FLOORING BASE

FIGURE 14

Return Air Opening −− Downflow Units

Return air may be brought in only through the top opening of a furnace installed in the downflow position. The follow- ing steps should be taken when installing plenum:

1 − Bottom edge of plenum should be flanged with a hemmed edge (See figure 15 or 16).

FIGURE 13

2 − After opening is cut, set the combustible flooring base into opening.

3 − Check fiberglass strips on the combustible flooring base to make sure they are properly glued and posi- tioned.

4 − Lower supply air plenum into the combustible flooring base until plenum flanges seal against fiberglass strips.

NOTE − Be careful not to damage fiberglass strips. Check for a tight seal.

5 − Set the furnace over the plenum.

6 − Ensure that the seal between the furnace and plenum is adequate.

Installation on Cooling Coil Cabinet Figure 14

2 − Sealing strips should be used to ensure an airtight seal between the cabinet and the plenum.

3 − In all cases, plenum should be secured to top of fur- nace using sheet metal screws.

4 − Make certain that an adequate seal is made.

PLENUM

(Field Provided) SECURE FROM OUTSIDE CABINET

	SEALING STRIP	CABINET
		SIDE PANEL
	(Field Provided)

Side View

FIGURE 15

NOTE − Downflow combustible flooring kit is not used..

1 − Refer to reverse−flow coil installation instructions for correctly sized opening in floor and installation of cabi- net.

2 − When cooling cabinet is in place, set and secure the furnace according to the instructions that are provided with the cooling coil. Secure the furnace to the cabinet.

PLENUM

(Field Provided)

SECURE FROM
INSIDE CABINET	Side View

SEALING STRIP (Field Provided)

CABINET

SIDE PANEL

3 − Seal the cabinet and check for air leaks.

FIGURE 16

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Contents Table of Contents Installation Instructions ML193DFML193DF ML193DF Unit Dimensions − inches mmBlower Motor BAG AssemblyML193DF Parts Arrangement Control BOXShipping and Packing List Safety InformationDirect Vent Installation NON−DIRECT Vent ML193DF Gas FurnaceUse of Furnace as Construction Heater Combustion, Dilution & Ventilation Air GeneralEquipment in Confined Space − ALL AIR from Inside Equipment in Confined Space − ALL AIR from Outside Shipping Bolt RemovalFront Horizontal Back Installation − Setting EquipmentSetting Equipment NC‡ NON−COMBUSTIBLE Floor Opening Size− Seal the cabinet and check for air leaks Combustible Flooring Base Opening SizeSide View Duct System Pipe & Fittings SpecificationsPiping and Fittings Specifications FiltersOutdoor Termination Kits Usage Schedule Joint Cementing ProcedureVenting Practices Piping Suspension GuidelinesML193DF MIN. Vent Length Model Vent Piping GuidelinesMinimum Vent Pipe Lengths Maximum Allowable Intake or Exhaust Vent Length in Feet Intake Exhaust Typical Exhaust Pipe ConnectionsTypical Intake Pipe Connections Typical AIR Intake Pipe Connections Inches 305mm or 12 in mm Inside Corner DetailUS Installations1 Canadian Installations2 FLUSH−MOUNT Side Wall Termination KIT 51W11 − On field supplied terminations, a minimum distanceDirect Vent Roof Termination KIT 51mm 76mm Vent Pipe Support Reducer MAY beRequired to Adapt Unconditioned SpaceTop View Front ViewExhaust NON−DIRECT Vent Roof Termination KIT 203mm − 305mmML193DF NON−DIRECT Vent Application Using Existing Chimney To drain ML193DF with Evaporator CoilTrap / Drain Assembly Using 1/2 PVC or 3/4 PVC Furnace Isolate GAS Valve Gas PipingGAS Pipe Capacity − FT3/HR kL/HR Electrostatic Discharge ESD Precautions and ProceduresElectrical BOX Inside FACTORY− Installed Left Side MAKE−UPInterior MAKE−UP BOX Exterior MAKE−UP BOXThermostat Designations Typical ML193DF Field Wiring DiagramTypical ML193DF Wiring Diagram Automatic Hot Surface Ignition System For Your Safety Read Before OperatingUnit Start−Up Integrated ControlPage High Altitude Information Gas Pressure AdjustmentGAS Meter Clocking Chart Proper Combustion73W37 73W81 68W68 74W90 74W91 69W73 2286 − 3038m2286m 3048m No Jumper Other Unit AdjustmentsHeat FAN-OFF Time in Seconds High Low In. w.g Cfm Watts Cfm Watts cfm Watts Blower DataElectrical SHOCK, Fire Or Explosion Hazard ServicePage LED #1 Red LED #2 Green Planned ServiceIgnition Control Board Diagnostic Codes Diagnostic CodesHeating Sequence of Operation Troubleshooting Heating Sequence of OperationNormal Heating Mode Abnormal Heating Mode Heating Sequence Cooling Sequence of Operation Troubleshooting Cooling Sequence of OperationNormal Cooling Mode Abnormal Cooling Mode Continuous Heat Speed FAN Sequence of Operation Troubleshooting Continuous Fan Sequence of OperationRepair Parts List Intake / Exhaust Pipe Start−Up & Performance Check ListGAS Supply Return AIR Duct System Supply AIR DuctVent Pipe Temperature RiseTotal External Static Drain Line Condensate Line ThermostatLY BELOW. Keep Clear of ALL OBSTRUC- Tions Requirements for Commonwealth of Massachusetts