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

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IMPORTANT

ML193DF exhaust and intake connections are made of PVC. Use PVC primer and solvent cement when using PVC vent pipe. When using ABS vent pipe, use transitional solvent cement to make connections to the PVC fittings in the unit.

Use PVC primer and solvent cement or ABS solvent cement meeting ASTM specifications, refer to Table 4. As an alter- nate, use all purpose cement, to bond ABS, PVC, or CPVC pipe when using fittings and pipe made of the same materi- als. Use transition solvent cement when bonding ABS to ei- ther PVC or CPVC.

Low temperature solvent cement is recommended during cooler weather. Metal or plastic strapping may be used for vent pipe hangers. Uniformly apply a liberal coat of PVC primer for PVC or use a clean dry cloth for ABS to clean in- side socket surface of fitting and male end of pipe to depth of fitting socket.

Canadian Applications Only − Pipe, fittings, primer and solvent cement used to vent (exhaust) this ap- pliance must be certified to ULC S636 and supplied by a single manufacturer as part of an approved vent (ex- haust) system. In addition, the first three feet of vent pipe from the furnace flue collar must be accessible for inspection.

TABLE 5

OUTDOOR TERMINATION KITS USAGE

STANDARD

CONCENTRIC

Outdoor

Outdoor

VENT

Exhaust

Exhaust

2" Wall Plate

3" Wall Plate

2" Wall

Flush-

1−1/2"

2"

3"

Accelerator

Accelerator

Mount

Concentric

Concentric

Concentric

Kit

Kit

Ring Kit

ML193

PIPE

(Dia. X

(Dia. X

Kit

Kit

Kit

Kit

UNIT

DIA.

Length)

Length)

(in.)

22G44

44J40

71M80

69M29

60L46

1−1/2" X 12"

2" X 12"

15F74

51W11**

or

or

or 30G28

or 81J20

or 44W93

44W92

44W92

2

YES

YES

YES*

YES

YES

YES

045

2−1/2

YES

YES

YES*

YES

YES

YES

3

YES

YES

YES*

YES

YES

YES

2

YES

YES

YES*

YES

YES

YES

070

2−1/2

YES

YES

YES*

YES

YES

YES

3

YES

YES

YES*

YES

YES

YES

2

YES

YES

YES

YES

YES

YES

090

2−1/2

YES

YES

YES

YES

YES

YES

3

YES

YES

YES

YES

YES

YES

110

3

YES

YES

YES

YES

YES

YES

*Requires field−provided and installed 1−1/2" exhaust accelerator.

**Kit 51W11 is provided with a 1−1/2" accelerator which must be used for all ML193DF−045, −070 and −090 installations. ermination kits 44W92, 44W93, 30G28 and 81J20 approved for use in Canadian installations to meet CSAB149.

The 44W92 Concentric kit is provided with a 1−1/2" accelerator which must be installed on the exhaust outlet when this kit i s used with the ML193DF045P36B and ML193DF070P36B furnaces.

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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 RemovalSetting Equipment Installation − Setting EquipmentFront Horizontal Back NC‡ NON−COMBUSTIBLE Floor Opening SizeSide View Combustible Flooring Base Opening Size− 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 ScheduleMinimum Vent Pipe Lengths Vent Piping GuidelinesML193DF MIN. Vent Length Model Maximum Allowable Intake or Exhaust Vent Length in Feet Typical Intake Pipe Connections Typical Exhaust Pipe ConnectionsIntake Exhaust Typical AIR Intake Pipe Connections Inches 305mm or 12 in mm Inside Corner DetailUS Installations1 Canadian Installations2 Direct Vent Roof Termination KIT − On field supplied terminations, a minimum distanceFLUSH−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 Electrical Precautions and ProceduresElectrostatic 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 Information2286m 3048m 2286 − 3038m73W37 73W81 68W68 74W90 74W91 69W73 Heat FAN-OFF Time in Seconds Other Unit AdjustmentsNo 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 GreenNormal Heating Mode Abnormal Heating Mode Troubleshooting Heating Sequence of OperationHeating Sequence of Operation Heating Sequence Normal Cooling Mode Abnormal Cooling Mode Troubleshooting Cooling Sequence of OperationCooling 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