Lennox International Inc ML193DF Troubleshooting Continuous Fan Sequence of Operation

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Troubleshooting: Continuous Fan Sequence of Operation

CONTINUOUS HEAT SPEED FAN SEQUENCE OF OPERATION

LED: SLOW FLASH RATE REMAINS

UNCHANGED THROUGHOUT SEQUENCE.

MANUAL FAN SELECTION MADE AT THERMOSTAT. CONTROL (G) ENERGIZES SYSTEM FAN AT HEAT SPEED. EAC TERMINAL IS ENERGIZED.

THERMOSTAT CALLS FOR HEAT (W).

NOYES

HUM TERM. ENERGIZES WITH COMB. AIR INDUCER.

THERMOSTAT CALLS FOR COOLING.

YES	NO

SYSTEM FAN SWITCHED TO COOL SPEED.

EAC TERM. REMAINS ON.

THERMOSTAT OPENS.

MANUAL FAN SELECTION MADE AT THERMOSTAT. CONTROL (G) ENERGIZES SYSTEM FAN AT HEAT

SPEED. EAC TERM. ENERGIZED.

SYSTEM FAN REMAINS ON

HEATING SPEED.

THERMOSTAT OPENS.

HUM TERM. DE−ENERGIZES WITH COMB. AIR INDUCER

SYSTEM FAN REMAINS ON

HEATING SPEED.

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Contents Installation Instructions ML193DF Table of ContentsML193DF Unit Dimensions − inches mm ML193DFBAG Assembly ML193DF Parts ArrangementControl BOX Blower MotorSafety Information Direct Vent Installation NON−DIRECT VentML193DF Gas Furnace 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 Pipe & Fittings Specifications Piping and Fittings SpecificationsFilters Duct SystemOutdoor Termination Kits Usage Joint Cementing Procedure Venting PracticesPiping 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 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 Reducer MAY be Required to AdaptUnconditioned Space 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 FACTORY− Installed Left Side MAKE−UP Interior MAKE−UP BOXExterior MAKE−UP BOX BOX InsideTypical ML193DF Field Wiring Diagram Thermostat DesignationsTypical ML193DF Wiring Diagram For Your Safety Read Before Operating Unit Start−UpIntegrated Control Automatic Hot Surface Ignition SystemPage Gas Pressure Adjustment GAS Meter Clocking ChartProper Combustion 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 Planned Service Ignition Control Board Diagnostic CodesDiagnostic 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 Start−Up & Performance Check List GAS SupplyReturn AIR Duct System Supply AIR Duct Intake / Exhaust PipeTemperature Rise Total External Static Drain LineCondensate Line Thermostat Vent PipeRequirements for Commonwealth of Massachusetts LY BELOW. Keep Clear of ALL OBSTRUC- Tions