Lennox International Inc ML193DF installation instructions Typical AIR Intake Pipe Connections

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Intake Piping

The ML193DF furnace may be installed in either direct vent or non−direct vent applications. In non−direct vent applications, when intake air will be drawn into the furnace from the surrounding space, the indoor air quality must be considered. Guidelines listed in Combustion, Dilution and Ventilation Air section must be followed.

Follow the next two steps when installing the unit in Direct Vent applications, where combustion air is taken from outdoors and flue gases are discharged outdoors. The provided air intake screen must not be used in direct vent applications (outdoors).

1 − Use cement to secure the intake pipe to the inlet air connector.

2 − Route piping to outside of structure. Continue with installation following instructions given in general guide lines for piping terminations and intake and ex- haust piping terminations for direct vent sections. Re- fer to table 7 for pipe sizes.

TYPICAL AIR INTAKE PIPE CONNECTIONS

NON−DIRECT VENT APPLICATIONS

AIR

INTAKE SCREEN (Provided)

NOTE − Air intake screen and elbow may be rotated, so that screen may be positioned to face forward or to either side.

FIGURE 22

Follow the next two steps when installing the unit in Non- Direct Vent applications where combustion air is taken from indoors and flue gases are discharged outdoors.

1 − Use field−provided materials and the factory−provided air intake screen to route the intake piping as shown in figure 22. Maintain a minimum clearance of 3" (76mm) around the air intake opening. The air intake opening (with the protective screen) should always be directed forward, or sideways.

2 − Use cement to secure the intake pipe to the connector, if desired.

General Guidelines for Vent Terminations

In Non-Direct Vent applications, combustion air is taken from indoors and the flue gases are discharged to the out- doors. The ML193DF is then classified as a non-direct vent, Category IV gas furnace.

In Direct Vent applications, combustion air is taken from outdoors and the flue gases are discharged to the out- doors. The ML193DF is then classified as a direct vent, Category IV gas furnace.

In both Non-Direct Vent and Direct Vent applications, the vent termination is limited by local building codes. In the absence of local codes, refer to the current National Fuel Gas Code ANSI Z223−1/NFPA 54 in U.S.A., and current CSA−B149 Natural Gas and Propane Installation Codes in Canada for details.

Position termination according to location given in figure 23 or 24. In addition, position termination so it is free from any obstructions and 12" above the average snow accumula- tion.

At vent termination, care must be taken to maintain protective coatings over building materials (prolonged exposure to exhaust condensate can destroy protective coatings). It is recommended that the exhaust outlet not be located within 6 feet (1.8m) of a condensing unit because the condensate can damage the painted coating.

NOTE − If winter design temperature is below 32°F (0°C), exhaust piping should be insulated with 1/2" (13mm), Ar- maflex or equivalent when run through unheated space. Do not leave any surface area of exhaust pipe open to out- side air; exterior exhaust pipe should be insulated with 1/2" (13mm) Armaflex or equivalent. In extreme cold cli- mate areas, 3/4" (19mm) Armaflex or equivalent may be necessary. Insulation on outside runs of exhaust pipe must be painted or wrapped to protect insulation from de- terioration. Exhaust pipe insulation may not be necessary in some specific applications.

NOTE − During extremely cold temperatures, below approximately 20°F (6.7°C), units with long runs of vent pipe through unconditioned space, even when insulated, may form ice in the exhaust termination that prevents the unit from operating properly. Longer run times of at least 5 minutes will alleviate most icing problems. Also, a heating cable may be installed on exhaust piping and termination to prevent freeze−ups. Heating cable installation kit is available from Lennox. See Condensate Piping section for part numbers.

IMPORTANT

Do not use screens or perforated metal in exhaust terminations. Doing so will cause freeze−ups and may block the terminations.

IMPORTANT

For Canadian Installations Only:

In accordance to CSA International B149 installation codes, the minimum allowed distance between the combustion air intake inlet and the exhaust outlet of other appliances shall not be less than 12 inches (305mm).

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Contents Installation Instructions ML193DF Table of ContentsML193DF Unit Dimensions − inches mm ML193DFControl BOX BAG AssemblyML193DF Parts Arrangement Blower MotorML193DF Gas Furnace Safety InformationDirect Vent Installation NON−DIRECT Vent Shipping and Packing ListUse of Furnace as Construction Heater General Combustion, Dilution & Ventilation AirEquipment in Confined Space − ALL AIR from Inside Shipping Bolt Removal Equipment in Confined Space − ALL AIR from OutsideInstallation − Setting Equipment Setting EquipmentFront Horizontal Back NON−COMBUSTIBLE Floor Opening Size NC‡Combustible Flooring Base Opening Size Side View− Seal the cabinet and check for air leaks Filters Pipe & Fittings SpecificationsPiping and Fittings Specifications Duct SystemOutdoor Termination Kits Usage Piping Suspension Guidelines Joint Cementing ProcedureVenting Practices 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 Inside Corner Detail Inches 305mm or 12 in mmUS 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 Unconditioned Space Reducer MAY beRequired to Adapt SupportFront View Top ViewExhaust 203mm − 305mm NON−DIRECT Vent Roof Termination KITML193DF NON−DIRECT Vent Application Using Existing Chimney ML193DF with Evaporator Coil To drainTrap / Drain Assembly Using 1/2 PVC or 3/4 PVC Gas Piping Furnace Isolate GAS ValveGAS Pipe Capacity − FT3/HR kL/HR Precautions and Procedures ElectricalElectrostatic Discharge ESD Exterior MAKE−UP BOX FACTORY− Installed Left Side MAKE−UPInterior MAKE−UP BOX BOX InsideTypical ML193DF Field Wiring Diagram Thermostat DesignationsTypical ML193DF Wiring Diagram Integrated Control For Your Safety Read Before OperatingUnit Start−Up Automatic Hot Surface Ignition SystemPage Proper Combustion Gas Pressure AdjustmentGAS Meter Clocking Chart High Altitude Information2286 − 3038m 2286m 3048m73W37 73W81 68W68 74W90 74W91 69W73 Other Unit Adjustments Heat FAN-OFF Time in SecondsNo Jumper Blower Data High Low In. w.g Cfm Watts Cfm Watts cfm WattsService Electrical SHOCK, Fire Or Explosion HazardPage Diagnostic Codes Planned ServiceIgnition Control Board Diagnostic 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 Troubleshooting Continuous Fan Sequence of Operation Continuous Heat Speed FAN Sequence of OperationRepair Parts List Return AIR Duct System Supply AIR Duct Start−Up & Performance Check ListGAS Supply Intake / Exhaust PipeCondensate Line Thermostat Temperature RiseTotal External Static Drain Line Vent PipeRequirements for Commonwealth of Massachusetts LY BELOW. Keep Clear of ALL OBSTRUC- Tions