Lennox International Inc MERIT SERIES GAS FURNACE DOWNFLOW AIR DISCHARGE Setting Equipment

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ML193DF09048C BLOWER MOTOR RIGID LEG

remove shipping bolt and washer

FIGURE 8

Installation − Setting Equipment

WARNING

Allow for clearances to combustible materials as indicated on the unit nameplate. Minimum clearances for closet or al- cove installations are shown in figure 11.

WARNING

Blower access panel must be securely in place when blower and burners are operating. Gas fumes, which could contain carbon monoxide, can be drawn into living space resulting in personal injury or death.

SETTING EQUIPMENT

Do not install the furnace on its front, back or in the horizontal position. See figure 10. Do not connect the return air ducts to the back of the furnace. Doing so will adversely affect the operation of the safety con- trol devices, which could result in personal injury or death.

Select a location that allows for the required clearances that are listed on the unit nameplate. Also consider gas supply connections, electrical supply, vent connection, condensate trap and drain connections, and installation

AIR FLOW

FRONT VIEW

AIR FLOW

AIR FLOW

1/2"

max.

SIDE VIEW

SIDE VIEW

and service clearances [24 inches (610 mm) at unit

front]. The unit must be level from side to side. Unit may be positioned from level to 1/2" toward the front to aid in draining. See figure 9.

Unit must be level side−to−side. Unit may be positioned from level to 1/2" toward the front to aid in draining.

FIGURE 9

Front

Horizontal

 

Back

NOTE − Do not install the furnace on its front, back or in the horizontal position

FIGURE 10

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Image 9
Contents Table of Contents Installation Instructions ML193DFML193DF ML193DF Unit Dimensions − inches mmML193DF Parts Arrangement BAG AssemblyControl BOX Blower MotorDirect Vent Installation NON−DIRECT Vent Safety InformationML193DF Gas Furnace Shipping and Packing ListUse 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 RemovalInstallation − Setting Equipment Setting EquipmentFront Horizontal Back NC‡ NON−COMBUSTIBLE Floor Opening SizeCombustible Flooring Base Opening Size Side View− Seal the cabinet and check for air leaks Piping and Fittings Specifications Pipe & Fittings SpecificationsFilters Duct SystemOutdoor Termination Kits Usage Venting Practices Joint Cementing ProcedurePiping Suspension Guidelines ScheduleVent Piping Guidelines Minimum Vent Pipe LengthsML193DF MIN. Vent Length Model Maximum Allowable Intake or Exhaust Vent Length in Feet Typical Exhaust Pipe Connections Typical Intake Pipe ConnectionsIntake Exhaust Typical AIR Intake Pipe Connections Inches 305mm or 12 in mm Inside Corner DetailUS Installations1 Canadian Installations2 − On field supplied terminations, a minimum distance Direct Vent Roof Termination KITFLUSH−MOUNT Side Wall Termination KIT 51W11 51mm 76mm Vent Pipe Required to Adapt Reducer MAY beUnconditioned Space SupportTop 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 Precautions and Procedures ElectricalElectrostatic Discharge ESD Interior MAKE−UP BOX FACTORY− Installed Left Side MAKE−UPExterior MAKE−UP BOX BOX InsideThermostat Designations Typical ML193DF Field Wiring DiagramTypical ML193DF Wiring Diagram Unit Start−Up For Your Safety Read Before OperatingIntegrated Control Automatic Hot Surface Ignition SystemPage GAS Meter Clocking Chart Gas Pressure AdjustmentProper Combustion High Altitude Information2286 − 3038m 2286m 3048m73W37 73W81 68W68 74W90 74W91 69W73 Other Unit Adjustments Heat FAN-OFF Time in SecondsNo Jumper High Low In. w.g Cfm Watts Cfm Watts cfm Watts Blower DataElectrical SHOCK, Fire Or Explosion Hazard ServicePage Ignition Control Board Diagnostic Codes Planned ServiceDiagnostic Codes LED #1 Red LED #2 GreenTroubleshooting Heating Sequence of Operation Normal Heating Mode Abnormal Heating ModeHeating Sequence of Operation Heating Sequence Troubleshooting Cooling Sequence of Operation Normal Cooling Mode Abnormal Cooling ModeCooling Sequence of Operation Continuous Heat Speed FAN Sequence of Operation Troubleshooting Continuous Fan Sequence of OperationRepair Parts List GAS Supply Start−Up & Performance Check ListReturn AIR Duct System Supply AIR Duct Intake / Exhaust PipeTotal External Static Drain Line Temperature RiseCondensate Line Thermostat Vent PipeLY BELOW. Keep Clear of ALL OBSTRUC- Tions Requirements for Commonwealth of Massachusetts