Lennox International Inc G61MP specifications Exhaust Pipe Termination Size Reduction

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Details of Intake and Exhaust Piping Terminations for Direct Vent Installations

NOTE − In Direct Vent installations, combustion air is taken from outdoors and flue gases are discharged to outdoors. Intake and exhaust pipes may be routed either horizontally through an outside wall or vertically through the roof. In at- tic or closet installations, vertical termination through the roof is preferred. Figures 20 through 28 show typical ter- minations.

1. Exhaust and intake exits must be in same pressure

zone. Do not exit one through the roof and one on the

side. Also, do not exit the intake on one side and the

exhaust on another side of the house or structure.

9. Based on the recommendation of the manufacturer, a multiple furnace installation may use a group of up to four termination kits WTK assembled together hori- zontally, as shown in figure 26.

TABLE 14

EXHAUST PIPE TERMINATION SIZE REDUCTION

G61MP

Exhaust Pipe Size

Termination Pipe Size

MODEL

 

 

 

 

 

045 and 070

2", 2−1/2", 3" or 4"

1−1/2"

090

2", 2−1/2", 3" or 4"

2"

110

2−1/2", 3" or 4"

2"*

135

3" or 4"

2"*

*Approved 3" concentric termination kit terminates with 2−5/8" ID pipe.

2. Intake and exhaust pipes should be placed as close

together as possible at termination end (refer to il-

lustrations). Maximum separation is 3" (76mm) on roof

terminations and 6" (152mm) on side wall termina-

Inches(mm)

3(76) MAX.

SIZE TERMINATION PIPE PER TABLE 14.

UNCONDITIONED

 

tions.

3.

If necessary, install a field−provided reducer to adapt

 

larger vent pipe size to termination pipe size.

4.

On roof terminations, the intake piping should termi-

 

nate straight down using two 90° elbows (See figure

 

20).

5.

Exhaust piping must terminate straight out or up as

 

shown. In rooftop applications, a reducer may be re-

 

quired on the exhaust piping at the point where it exits

 

the structure to improve the velocity of exhaust away

 

from the intake piping. See table 14.

8" (203) MIN

12" (305) ABOVE AVERAGE SNOW ACCUMULATION

3" (76) OR 2" (51) PVC

PROVIDE SUPPORT

FOR INTAKE AND

EXHAUST LINES

ATTIC SPACE

1/2" (13) FOAM INSULATION IN UNCONDITIONED SPACE

NOTE − Care must be taken to avoid recirculation of exhaust back into intake pipe.

6. On field supplied terminations for side wall exits, ex-

haust piping should extend a minimum of 12 inches

(305mm) beyond the outside wall. Intake piping

DIRECT VENT ROOF TERMINATION KIT

(15F75 or 44J41)

FIGURE 20

should be as short as possible. See figure 21.

7. On field supplied terminations, a minimum separation

distance between the end of the exhaust pipe and the

end of the intake pipe is 8 inches (203mm).

8. If intake and exhaust piping must be run up a side wall

to position above snow accumulation or other obstruc-

tions, piping must be supported every 3 ft. (.9m) as

shown in figure 12. Refer to figure 24 for proper piping

method. In addition, WTK wall termination kit must be

extended for use in this application. See figure 27.

When exhaust and intake piping must be run up an

outside wall, the exhaust piping is reduced to 1−1/2"

(38mm) after the final elbow. The intake piping may be

1/2" (13) ARMAFLEX

INSULATION IN

UNCONDITIONED SPACE

FIELD−

PROVIDED

REDUCER MAY

BE REQUIRED

TO ADAPT

LARGER VENT

PIPE SIZE TO

TERMINATION

OUTSIDE

WALL

2" (51) PVC COUPLING

12" (305) MAX.

(unless supported)

1/2" (13)

ARMAFLEX INSULATION

SIZE TERMINATION

PIPE PER

6" (152) TABLE 14. MAXIMUM

8" (203)

MINIMUM

Inches (mm)

equipped with a 90° elbow turndown. Using turndown

will add 5 feet (1.5m) to the equivalent length of the

pipe.

TOP VIEW WALL RING KIT

(15F74)

FIGURE 21

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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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