Lenox ML180UHE Horizontal Left Position Horizontal Right Position, Side Vent Discharge

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HORIZONTAL LEFT POSITION

HORIZONTAL RIGHT POSITION

Top Vent Discharge

Vent Pipe

Pressure

Switch

Flue

Transition

Top Vent Discharge

AIR

FLOW

Vent Pipe

Pressure Switch

Flue

Transition

Cover Plate

AIR

FLOW

Collector Box

Cover Plate

Make−Up Box

Collector Box

DDisconnect pressure switch hose from barbed fitting on the pressure switch assembly. Remove pressure switch assembly (1 screw) and cut wire tie to free pressure switch wires. Re− install pressure switch on the other side of orifice plate and re− connect pressure switch hose.

DRe−secure pressure switch wires: Either pull excess wires through the blower compartment and secure using supplied wire tie, or coil excess wire and secure to the gas manifold.

FIGURE 19

HORIZONTAL LEFT POSITION

Side Vent Discharge

Pressure Switch

AIR

FLOW

Vent Pipe

Make−Up Box

Collector Box

 

DCut combustion air inducer tubing from 9" to 7" to avoid inter- ference with inducer motor

DDisconnect pressure switch hose from barbed fitting on the pressure switch assembly. Remove pressure switch assembly (1 screw) and cut wire tie to free pressure switch wires. Re− install pressure switch on the other side of orifice plate and re− connect pressure switch hose.

DRe−secure pressure switch wires: Either pull excess wires through the blower compartment and secure using supplied wire tie, or coil excess wire and secure to the gas manifold.

FIGURE 20

Make−Up Box

DGas supply piping must be brought into the unit from the bot- tom in order to accommodate the flue pipe.

DCut combustion air inducer tubing from 9" to 8" to avoid inter- ference with inducer motor

DRemove make−up box assembly (2 screws) and cut wire tie to free make−up box wires. Re−install make−up box on other side of cabinet.

DRe−secure make−up box wires: Either pull excess wires through the blower compartment and secure using supplied wire tie, or coil excess wire and secure to the gas manifold.

FIGURE 21

HORIZONTAL RIGHT POSITION

Side Vent Discharge − no modifications necessary

Make−Up Box

Pressure Switch

Vent Pipe

AIR

FLOW

Flue Transition

Collector Box

FIGURE 22

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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 ValveShipping and Packing List Safety InformationML180UHE Gas Furnace 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 Left Right 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. dropRight−Side Air Discharge Horizontal ApplicationLeft−Side Air Discharge Electrostatic Discharge ESD Interior MAKE−UP BOX InstallationElectrical 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