Lennox International Inc Merit Series Gas Furnace Troubleshooting Heating Sequence of Operation

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Troubleshooting: Heating Sequence of Operation

NO

HEATING SEQUENCE OF OPERATION

NORMAL HEATING MODE

 

 

ABNORMAL HEATING MODE

 

 

 

 

 

 

 

 

 

 

 

 

 

POWER ON

 

 

 

 

 

 

 

 

 

GAS VALVE OFF. COMBUSTION AIR INDUCER OFF.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NO

INDOOR BLOWER DELAY OFF.

 

CONTROL SELF−CHECK OKAY?

 

 

LED #1 ON

 

 

 

 

 

 

 

 

 

LED #2 ON

 

 

 

 

 

 

 

 

 

(RESET CONTROL BY TURNING MAIN POWER OFF.)

 

 

 

YES

 

 

 

NO

 

 

 

 

 

 

 

POLARITY REVERSED.

 

 

 

 

 

 

 

 

 

 

IS POLARITY CORRECT?

 

 

LED #1 −− FAST FLASH

 

 

 

 

 

 

 

 

 

LED #2 −− SLOW FLASH

 

 

 

YES

 

 

 

 

 

 

 

 

 

 

 

 

NO

 

 

 

 

 

 

 

 

 

IMPROPER GROUND.

 

IS THERE A PROPER GROUND?

 

 

LED #1 −− ALTERNATING FAST FLASH

 

 

 

YES

 

 

 

 

 

LED #2 −− ALTERNATING FAST FLASH

 

 

 

 

 

NO

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LEDs SIGNAL FAST ALTERNATING FLASH.

 

 

 

IS VOLTAGE

 

 

 

 

 

 

 

 

 

 

 

CONTROL WILL NOT RESPOND TO A CALL FOR

 

 

 

ABOVE 90 VOLTS?

 

 

 

 

 

 

 

 

 

 

HEATING UNTIL VOLTAGE RISES ABOVE 95 VOLTS.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

YES

 

 

 

 

NO

GAS VALVE OFF. COMBUSTION AIR INDUCER ON.

 

 

 

 

 

INDOOR BLOWER ON.

 

ROLLOUT SWITCH CLOSED?

 

 

LED #1 −− ON. LED #2 −− SLOW FLASH.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SEQUENCE HOLDS UNTIL ROLLOUT SWITCH CLOSES

 

 

 

YES

 

 

 

 

AND POWER IS RESET OR T’STAT IS INTERRUPTED

 

 

 

 

 

 

 

 

 

FOR MINIMUM OF 1 SECOND.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NO

GAS VALVE OFF. COMBUSTION AIR INDUCER ON.

 

 

 

BURNER OFF?

 

INDOOR BLOWER ON HEATING SPEED.

 

 

 

 

 

 

(Flame sensed without gas valve energized)

 

 

LED #1 −− SLOW FLASH

 

 

 

 

 

 

YES

 

 

 

 

 

LED #2 −− OFF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NORMAL OPERATION:

LED #1 −− SLOW FLASH

LED #2 −− SLOW FLASH

YES

THERMOSTAT CALLS FOR HEAT:

LED #1 −− FAST FLASH

LED #2 −− FAST FLASH

YES

PRIMARY AND SECONDARY LIMIT SWITCH.

CLOSED?

YES

IS COMBUSTION AIR

PRESSURE SWITCH OPEN?

YES

IS COMBUSTION AIR INDUCER

ENERGIZED?

NO

NO

COMBUSTION AIR INDUCER OFF.

INDOOR BLOWER ON

LED #1 SLOW FLASH RATE

LED #2 −− ON

GAS VALVE OFF.

COMBUSTION AIR INDUCER OFF. INDOOR BLOWER OFF WITH DELAY. LED #1 OFF

LED #2 SLOW FLASH

(Sequence holds until pressure switch opens or thermostat resets control.)

YES

HAS COMBUSTION AIR PRESSURE SWITCH CLOSED IN 2.5 MINUTES?

YES

CONTINUED NEXT PAGE

PRESSURE SWITCH IS IN WATCHGUARD MODE. NO GAS VALVE OFF. COMBUSTION AIR INDUCER OFF.

INDOOR BLOWER OFF WITH DELAY.

LED #1 −− OFF. LED #2 −− SLOW FLASH.

IS 5-MINUTE RESET PERIOD COMPLETE?

YES

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Contents Installation Instructions ML180UH Table of ContentsUnit Dimensions − inches mm TOP ViewParts Arrangement ML180UH Gas Furnace Safety InformationShipping 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 Plenum Right Horizontal Application Installation Clearances Top LeftEnd Bottom Filters Duct SystemVenting Upflow PositionTop Vent Discharge Left Side Vent DischargeHorizontal Right Position Horizontal Left PositionSide Vent Discharge Vent 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 112 175 169 278 Carbon Monoxide Poisoning Hazard Ers or straps. Install a drip leg in vertical pipe runs to − In some localities, codes may require the installationGas Piping Every 8 to 10 feet 2.44 to 3.01 m with suitable hangLeft−Side Air Discharge Horizontal ApplicationRight−Side Air Discharge Electrical Interior MAKE−UP BOX InstallationElectrostatic Discharge ESD Thermostat Designations ML180UH Schematic Wiring Diagram and Sequence of Operation Typical ML180UH Field Wiring Diagram Integrated ControlFor Your Safety Read Before Lighting Unit Start−UpProper Combustion Gas Pressure AdjustmentHigh Altitude Other Unit Adjustments Manifold Pressure Settings at all AltitudesHeat FAN-OFF Time in Seconds No Jumper453 900 750680 885Single Side Return Air − Air volumes in bold require field 1391860 653Service Electrical SHOCK, Fire Or Explosion HazardML180UH BURNER, Combustion AIR Inducer Assembly Heat Exchanger Removal−090, −110 −135 units −045 and −070 unitsPage Planned Service Repair Parts ListIntegrated Control Diagnostic Codes DescriptionTroubleshooting Heating Sequence of Operation Normal Heating Mode Abnormal Heating ModeHeating Sequence Troubleshooting Cooling Sequence of Operation Normal Cooling Mode Abnormal Cooling ModeTroubleshooting Continuous Fan Sequence of Operation Continuous Heat Speed FAN Sequence of Operation

Merit Series Gas Furnace specifications

Lennox International Inc. is a leading name in the heating and cooling industry, and their Merit Series Gas Furnace embodies the commitment to quality and efficiency that the company is known for. The Merit Series is designed to provide reliable heating in a sustainable manner, making it an excellent choice for homeowners seeking comfort without excessive energy bills.

One of the standout features of the Merit Series Gas Furnace is its efficiency ratings. The units in this series typically boast Annual Fuel Utilization Efficiency (AFUE) ratings of up to 95%. This level of efficiency means that the furnace converts a significant portion of the fuel it uses into heat, ultimately lowering operating costs. Such energy-efficient performance is not only beneficial for the wallet but also promotes environmental sustainability.

The Merit Series also incorporates advanced technologies that enhance its operation. The inclusion of a multi-speed blower motor is a notable feature that provides thoughtful airflow management throughout the home. By adjusting the speed according to the heating needs, the furnace optimizes comfort levels while minimizing noise and energy consumption. Homeowners can enjoy a warm environment without the disruptive sounds often associated with traditional furnaces.

Moreover, the Merit Series comes equipped with durable construction materials designed to withstand the test of time. From the robust heat exchanger to the heavy-gauge cabinet, Lennox focuses on longevity and reliability. This ensures that homeowners can trust their furnace to operate effectively even in the harshest winter conditions.

Safety features are also integral to the design of the Merit Series Gas Furnace. With an integrated Flame Sensor and a built-in safety shut-off system, the furnace ensures that any irregularities in operation are promptly detected and addressed. Such measures provide peace of mind for families using the heating system throughout the cold months.

Installation and maintenance are further simplified with the Merit Series. Its design facilitates easier access for HVAC professionals, allowing for quicker installations and routine service, ensuring that homeowners spend less time and money on upkeep.

In conclusion, Lennox International Inc.'s Merit Series Gas Furnace combines efficiency, advanced technology, and robust construction, making it a top choice for families looking to enhance their home's heating system. With its energy-saving innovations and commitment to reliability, the Merit Series stands as an exemplary option in today’s market.