Lenox ML180UHE installation instructions Continuous FAN Sequence of Operation

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Troubleshooting: Continuous Fan Sequence of Operation

CONTINUOUS FAN SEQUENCE OF OPERATION

LED: SLOW FLASH RATE REMAINS

UNCHANGED THROUGHOUT SEQUENCE.

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

THERMOSTAT CALLS FOR HEAT (W).

NOYES

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 FAN

SPEED. EAC TERM. ENERGIZED.

SYSTEM FAN CONTINUES FAN SPEED WITHOUT INTERRUPTION. EAC TERMINAL REMAIN ON.

HUM TERMINAL IS ENERGIZED WITH COMBUSTION

AIR BLOWER.

SYSTEM FAN SWITCHES TO HEAT SPEAD AFTER 30 SECOND DELAY. EAC AND HUM TERMINAL REMAIN ON.

THERMOSTAT OPENS.

HUM. TERMINAL OFF AFTER POST PURGE BY COMBUSTION AIR BLOWER. SYTEM FAN SWITCHES TO FAN SPEED AFTER BLOWER OFF DELAY. EAC CONTINUES WITHOUT INTERRUPTION.

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Contents Installation Instructions ML180UHE Table of ContentsUnit Dimensions − inches mm TOP ViewBurner Box Parts ArrangementMake−Up Box Heat Exchanger Combustion Air Inducer Gas ValveSafety Information ML180UHE Gas FurnaceShipping and Packing List Use of Furnace as Construction Heater GeneralCombustion, Dilution & Ventilation Air Equipment in Confined Space ALL AIR from Inside Equipment in Confined Space Setting Equipment Return Air End Bottom Horizontal Application Installation Clearances Top LeftRight Typical Horizontal ApplicationFilters Duct SystemTop Vent Discharge VentingUpflow Position Left Side Vent DischargeSide Vent Discharge Horizontal Left Position Horizontal Right PositionHorizontal Left Position Side Vent Discharge − no modifications necessaryVent Connection Upflow and Horizontal Position Common Venting Using Metal−Lined Masonry Chimney −1/2 Cated or common venting system, you must inspect 18 − The common vent diameter must always be at least asFeet FAN + FAN FAN + NAT 130 Carbon Monoxide Poisoning Hazard Gas Piping Ers or straps. Install a drip leg in vertical pipe runs to− In some localities, codes may require the installation Gas supply piping should not allow more than 0.5W.C. dropHorizontal Application Left−Side Air DischargeRight−Side Air Discharge Interior MAKE−UP BOX Installation ElectricalElectrostatic Discharge ESD Thermostat Designations ML180UHE Schematic Wiring Diagram and Sequence of Operation Typical ML180UHE Field Wiring Diagram Integrated ControlFor Your Safety Read Before Lighting Unit Start−UpProper Combustion Gas Pressure AdjustmentGAS Meter Clocking Chart High AltitudeOther Unit Adjustments Manifold Pressure Settings at all AltitudesHeat FAN-OFF Time in Seconds No Jumper975 115 945 1380995 1345640 1940 420 1750 310 Single Side Return Air − Air volumes in bold require fieldOrder to maintain proper air velocity 230Service Electrical SHOCK, Fire Or Explosion Hazard−090, −110 −135 units ML180UHE BURNER, Combustion AIR Inducer AssemblyHeat Exchanger Removal −045 and −070 unitsPlanned Service Repair Parts ListIntegrated Control Diagnostic Codes RED LEDNormal Heating Mode Abnormal Heating Mode Heating Sequence of OperationHeating Sequence Normal Cooling Mode Abnormal Cooling Mode Cooling Sequence of OperationContinuous FAN Sequence of Operation Start−Up & Performance Check List Unit Operation Cooling ModeTemperature Rise Drain Line

Lennox Merit Series Gas Furnace Upflow/Horizontal air discharge, ML180UHE specifications

The Lenox ML180UHE is a reliable and efficient gas furnace that falls within the Lennox Merit Series. This model is designed for upflow or horizontal air discharge, making it versatile for various installation requirements. With its robust construction and advanced technology, the ML180UHE is ideal for homeowners seeking a dependable heating solution that combines comfort and efficiency.

One of the main features of the ML180UHE is its impressive 80% Annual Fuel Utilization Efficiency (AFUE) rating. This efficiency means that 80 cents of every dollar spent on fuel is used to heat your home while minimizing waste. This furnace is equipped with a multi-speed blower motor that enhances the overall air circulation in your home, providing consistent temperatures and improved comfort.

The ML180UHE features a durable heat exchanger made of high-quality materials, which ensures longevity and reliable performance. The design of the heat exchanger maximizes heat transfer efficiency, allowing the furnace to quickly warm your home while also maintaining optimal efficiency levels throughout its lifespan.

Lennox has integrated advanced technologies into the ML180UHE to enhance its operation and user experience. The unit is compatible with a variety of thermostats, including Lennox's innovative iComfort S30 Smart Thermostat, allowing for easy temperature control and programming capabilities. This smart technology can learn your preferences, optimize energy usage, and enable remote access through a smartphone app.

In addition to its energy efficiency, the ML180UHE offers quiet operation, making it an excellent choice for residential environments. The well-insulated cabinet helps to reduce noise levels, providing a peaceful indoor atmosphere.

Installation and maintenance are simplified with the ML180UHE due to its compact design and accessible components. The furnace is designed to fit into tight spaces, allowing for flexible installation options. Regular maintenance is uncomplicated, ensuring that homeowners can keep the unit running at peak performance with minimal effort.

Overall, the Lennox ML180UHE gas furnace provides users with a reliable, efficient, and quiet heating solution. With its combination of advanced technology, durable design, and ease of use, it is an excellent choice for anyone looking to enhance the comfort of their home while optimizing energy consumption.