Lennox International Inc G61MP specifications Vent Piping Guidelines

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A−Vent Piping Guidelines

The G61MP can be installed as either a Non−Direct Vent or a Direct Vent gas central furnace.

NOTE − In Non-Direct Vent installations, combustion air is taken from indoors and flue gases are discharged outdoors. In Direct Vent installations, combustion air is taken from out- doors and flue gases are discharged outdoors.

Intake and exhaust pipe sizing in Direct Vent applications and exhaust pipe sizing in Non-Direct Vent applications −− Size pipe according to tables 12 and 13. Table 12 lists the minimum equivalent vent pipe lengths permitted. Table 13 lists the maximum equivalent pipe lengths permitted.

Maximum vent length is defined as:

Total length (linear feet) of pipe,

Plus Equivalent length (feet) of fittings,

Plus Equivalent length (feet) of termination.

NOTE − Include ALL pipe and ALL fittings, both in doors and outdoors.

Regardless of the diameter of pipe used, the standard roof and wall terminations described in section Exhaust Piping Terminations should be used. Exhaust vent termination pipe is sized to optimize the velocity of the exhaust gas as it exits the termination. Refer to table 14.

*NOTE − The exhaust pipe should be offset a minimum of 12 inches to avoid the possibility of water droplets being re- leased from the exhaust termination. The minimum ex- haust vent length is 15 ft. Shorter exhaust vent lengths may result in the discharge of water droplets from the exhaust termination, in spite of the 12−inch vertical offset.

Each 90° elbow (including those provided with the furnace) of any diameter is equivalent to 5 feet (1.52m) of vent pipe of the same diameter. Two 45° elbows are equivalent to one 90° elbow of the same diameter. One 45° elbow is equal to 2.5 feet (.76m) of vent pipe of the same diameter. In some applications which permit the use of several differ- ent sizes of vent pipe, a combination vent pipe may be used. Contact the Application Department for assistance in sizing vent pipe in these applications.

NOTE − The flue collar on all models is sized to accommo- date 2" Schedule 40 flue pipe. When vent pipe which is larger than 2" must be used in an upflow application, a 2" elbow must be applied at the flue collar in order to proper- ly transition to the larger diameter flue pipe. This elbow must be added to the elbow count used to determine ac- ceptable vent lengths. Assign an equivalent feet value to this elbow according to the larger size pipe being used. Contact the Application Department for more information concerning sizing of vent systems which include multiple pipe sizes.

Exhaust Pipe Offset

12" Min.

Upflow and Downflow Application

Rooftop Termination

12" Min.

12" Min.

Upflow and Downflow Application

Side Wall Termination

12" Min.

Horizontal Application Rooftop Termination

Horizontal Application Side Wall Termination

FIGURE 11

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Contents G61MP Table of ContentsAfue SpecificationsOptional Accessories − Must be Ordered Extra 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 S10First stage Negative Pressure Second stage Positive Dual Combustion AIR Prove SwitchCAI & Cold END Header BOX Assembly Combustion Air Inducer B6 Outdoor Termination Kits and Corresponding Equivalencies II−PLACEMENT and Installation−Vent Piping Guidelines Maximum Vent Pipe Lengths −PVC Joint Cementing ProcedureMinimum 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 DirectionSide View NON−DIRECT Vent Wall Ring Termination G61MP NON−DIRECT Vent Application Using Existing ChimneyCondensate Piping Vent Nipple TEE Screw Coupling CLEAN−OUT Access Condensate AssemblyHose clamp −RINGS CAP HI/LO Screws−Heating Start-Up For Your Safety Read Before Operating−Preliminary and Seasonal Checks 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−External Static Pressure −Flame Signal−Temperature Rise −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 TWO VIII− Field Wiring Applications and Jumper SettingsSingle 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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