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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Lennox International Inc G61MP specifications Table of Contents

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.