Lennox International Inc Explore High-Efficiency Gas Furnaces for Your Home with G61MP
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G61MP

Service Literature

Corp. 0308−L6

Revised 10−2004

G61MP SERIES UNITS

G61MP series units are high−efficiency multi−position (up- flow, downflow, horizontal right and left) gas furnaces manufactured with Lennox Duralok Plust heat exchang- ers formed of aluminized steel. G61MP units are available in heating capacities of 44,000 to 132,000 Btuh (13.0.0 to

38.6kW) and cooling applications from 2 to 5 tons (7.0 kW to 17.5 kW)) up to 5 tons. Refer to Engineering Handbook for proper sizing.

Units are factory equipped for use with natural gas. Kits are available for conversion to LPG operation. G61MP model units are equipped with the Two−Stage Integrated SureLight control. All G61MP units meet the California Nitrogen Ox- ides (NOx) Standards and California Seasonal Efficiency re- quirements. All units use a redundant gas valve to assure safety shut−off as required by C.S.A.

All specifications in this manual are subject to change. Pro- cedures outlined in this manual are presented as a recom- mendation only and do not supersede or replace local or state codes. In the absence of local or state codes, the guidelines and procedures outlined in this manual (except where noted) are recommendations only and do not consti- tute code.

TABLE OF CONTENTS

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Blower Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Parts Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

I Unit Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

II Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

III Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

IV Heating System Service Checks . . . . . . . . . . . . . . 31

V Typical Operating Characteristics . . . . . . . . . . . . . . 34

VI Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

VII Wiring and Sequence of Operation . . . . . . . . . . . . 38

VIII Field Wiring and Jumper Setting . . . . . . . . . . . . . 46

IX Control Board Troubleshooting . . . . . . . . . . . . . . . . 48

IMPORTANT

Improper installation, adjustment, alteration, service or maintenance can cause property damage, person- al injury or loss of life. Installation and service must be performed by a qualified installer, service agency or the gas supplier.

WARNING

Electric shock hazard. Can cause injury or death. Before attempting to perform any service or maintenance, turn the electrical power to unit OFF at discon- nect switch(es). Unit may have multiple power supplies.

WARNING

Sharp edges.

Be careful when servicing unit to avoid sharp edges which may result in personal injury.

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♥2003 Lennox Industries Inc.

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Contents G61MP Table of ContentsOptional Accessories − Must be Ordered Extra SpecificationsAfue Direct Vent G61MP−36B−045 Performance Less Filter Blower Data1495 2340 1285 1385 2410 G61MP Parts Arrangement Glass AssemblyTOP CAP Sight BlowerCircuit Breaker CB8 Door Interlock Switch S51−Control Box Control Transformer T1 Integrated Control Board A92Page Integrated Control Board Terminals 120VAC Neutral TWO−STAGE Integrated Control Board120VAC Line Integrated Control Board 5 Pin TerminalSecondary Limit Controls S21 −Blower Compartment Blower Motor B3 and Capacitor C4DS1 DS2 Description Supply AIR BlowerIgnitor −Heating Components Flame SensorBurners Figure Ignitor Bracket Burners Front View Burners TOP ViewCombustion Air Inducer Prove Switch S18 Flame Rollout Switches S47Clamshell Heat Exchanger Primary Limit Control S10CAI & Cold END Header BOX Assembly Dual Combustion AIR Prove SwitchFirst stage Negative Pressure Second stage Positive Combustion Air Inducer B6 Outdoor Termination Kits and Corresponding Equivalencies II−PLACEMENT and Installation−Vent Piping Guidelines Minimum Vent Pipe Lengths −PVC Joint Cementing ProcedureMaximum Vent Pipe Lengths Upflow or Downflow Direct or NON-DIRECT Vent Applications − Venting PracticesTypical Exhaust Pipe Connections From indoors and flue gases are discharged outdoors Direct Vent applications where combustion air is takenReducer Plug ReducerSweep ELL Carbon Monoxide Poisoning HazardPage − G61MP Vent Termination − AIR Inlet of Other Appliance Exhaust Pipe Termination Size Reduction Side View Front ViewG61MP Direct Vent Application Using Existing Chimney ANGLE−CUT in DirectionCondensate Piping G61MP NON−DIRECT Vent Application Using Existing ChimneySide View NON−DIRECT Vent Wall Ring Termination Vent Nipple TEE Screw Coupling CLEAN−OUT Access Condensate AssemblyHose clamp −RINGS CAP HI/LO Screws−Preliminary and Seasonal Checks For Your Safety Read Before Operating−Heating Start-Up IV−HEATING System Service Checks A−C.S.A. Certification −Safety or Emergency Shutdown−Testing Gas Piping −Extended Period Shutdown−Check Manifold Pressure −Testing Gas Supply Pressure− Proper Gas Flow Approximate − Proper Combustion− Condensate pH Range − High Altitude−Temperature Rise −Flame Signal−External Static Pressure −Blower Speed Taps VI−MAINTENANCEPage Page VII− Wiring and Sequence of Operation Sequence of Operation On Next Heating Sequence of Operation Normal Operation DS1 and DS2 Simultaneous Slow Flash YES See BOX a LOW Flame Signal YESEN or Heat Demand is SATISFIED. a Five Cooling Sequence of Operation Continuous LOW Speed FAN Sequence of Operation Single VIII− Field Wiring Applications and Jumper SettingsTWO Transformer CoolLED#2−Off Miswiring of furnace or improper con − Both diagnostic lights fail to light upDoor interlock switch failure − Diagnostic lights flash the roll−out− Diagnostic lights flash the limit failure mode Uous fan demand Primary, secondary or backup seconLED#1−Slow Flash Miswiring of furnace or improper Connections at limit switchesLED#1−Off Prove switch lines damaged Switch failure code 2.5 minutes afterCondensate in prove switch line Prove switch does not close due to aSwitch code Terminating the unit − Diagnostic lights flash the pressureWith a heating demand Installed − After 5 tries the control diagnostics− Diagnostic lights flash roll−out fail − Roll−out switch trips duringFails to stay lit Operation. Problem is characterized − Combustion air inducer energizesNostic lights flash low flame sense Burner Mode Er motorLED#1−Slow Flash Sensor rod is contaminatedService Notes

G61MP specifications

Lennox International Inc. has long been a leader in HVAC solutions, and the G61MP gas furnace exemplifies the company's commitment to innovation and energy efficiency. This high-efficiency gas furnace operates with an Annual Fuel Utilization Efficiency (AFUE) of up to 96%, allowing homeowners to save significantly on energy costs while maintaining a comfortable indoor environment.

One of the primary features of the G61MP is its modulating gas valve. This technology enables the furnace to operate at multiple levels of heating output, ensuring that it can adjust its performance according to the home’s heating demands. By modulating the heating output, the G61MP maximizes efficiency and minimizes energy waste, providing a consistent temperature and improved comfort.

The G61MP also incorporates advanced two-stage heating, which enhances its performance by reducing temperature fluctuations in the home. This feature is especially beneficial during transitional weather periods when heating needs may vary widely. With its ability to operate on a lower stage most of the time, the furnace can produce quieter operation and reduced energy consumption.

In terms of design, the G61MP includes a sealed combustion chamber that draws air from outside the home for combustion, enhancing safety and efficiency. This design feature eliminates the need for indoor air, improving indoor air quality. The furnace is also equipped with a high-efficiency ECM blower motor that not only boosts comfort but operates quietly and uses less electricity compared to traditional motors.

Further enhancing its efficiency, the G61MP utilizes a variable-speed blower, which allows for precise control of airflow throughout the home. This results in better humidity control and improved air distribution, providing an overall more comfortable environment.

The Lennox G61MP is compatible with the iComfort S30 smart thermostat, allowing homeowners to control their heating remotely, adjust settings based on their schedules, and access energy usage data. This connectivity transforms the G61MP into an integral part of a smart home ecosystem, facilitating energy conservation and comfort optimization.

Lastly, the G61MP is designed with durability in mind. Its robust construction and high-quality materials ensure reliable performance and lengthy service life. Homeowners can feel assured that they are investing in a heating solution that will meet their needs for many winters to come. In summary, the Lennox G61MP gas furnace stands out with its high efficiency, advanced technology, and user-friendly features, making it a top choice for homeowners seeking exceptional heating performance.
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