Setting an Upflow Unit

When the side return air inlets are used in an upflow ap- plication, it may be necessary to install leveling bolts on the bottom of the furnace. Use field−supplied corrosion−resist- ant 5/16 inch machine bolts (4) and nuts (8). See figure 12. NOTE − The maximum length of the bolt is 1−1/2 inches.

1 − Lie the furnace on its back and drill a 5/16 inch diame- ter hole in each corner of the furnace’s bottom. See fig- ure 12 for the correct location of the holes. Drill through the bottom panel and the bottom flange of the cabinet.

2 − Install one bolt and two nuts into each hole. Screw the first nut onto a bolt and then insert the bolt into a hole. A flat washer may be added between the nut and the bot- tom of the unit.

3 − Screw another nut onto the bolt on the inside of the fur- nace base. A flat washer may be added between the nut and the bottom of the unit.

4 − Adjust the outside nut to the appropriate height and tighten the inside nut to secure the arrangement.

NOTE − The unit may be tilted back−to−front a maximum of 1". This will ensure proper draining of the heat exchanger.

Leveling Bolt Installation

 

3/8

Inches (mm)

 

 

 

(10)

 

Furnace Front

 

 

3/8

 

1−3/4

(10)

 

(44)

1−3/4

 

Leveling Bolt

(44)

 

 

Furnace

Locations

 

 

 

Bottom

 

Leveling Bolt

 

3/8

 

(10)

Locations

 

 

 

3/8

 

1−3/4

(10)

 

(44)

 

1−3/4 (44)

 

FIGURE 12

Downflow Applications

The unit may be installed three ways in downflow applica- tions: on non−combustible flooring, on combustible flooring using an additive base, or on a reverse−flow cooling cabi- net. Do not drag the unit across the floor in the down- flow position. Flange damage will result.

After unit has been properly set in place, position provided logo over existing logo and affix sticker on front panel.

Refer to figure 13 for clearances in downflow applica- tions.

Downflow Application Installation Clearances

 

Top

Left Side

Right Side

 

Bottom

Top

0

*Front

0

Back

0

Sides

0†

Vent

0

Floor

NC‡

*Front clearance in alcove installation must be 24 in. (610 mm). Maintain a minimum of 24 in. (610 mm) for front service access. †Allow proper clearances to accommodate condensate trap and vent pipe installation.

‡The furnace may be installed on a combustible wood floor if an op- tional additive base is installed between the furnace and the com- bustible floor.

FIGURE 13

Installation on Non−Combustible Flooring

1 − Cut floor opening keeping in mind clearances listed on unit rating plate. Also keep in mind gas supply connec- tions, electrical supply, flue and air intake connections and sufficient installation and servicing clearances. See table 1 for correct floor opening size.

2 − Flange warm air plenum and lower the plenum into the opening.

3 − Set the unit over the plenum and seal the plenum to the unit.

4 − Ensure that the seal is adequate.

TABLE 1

NON−COMBUSTIBLE FLOOR OPENING SIZE

 

Front to Rear

Side to Side

Model No.

in.

mm

in.

mm

 

B Cabinet (17.5")

19 − 3/4

502

16 − 5/8

422

C Cabinet (21")

19 − 3/4

502

20−1/8

511

D Cabinet (24.5")

19 − 3/4

502

23 − 5/8

600

NOTE − Floor opening dimensions listed are 1/4 inch (6 mm) larger than the unit opening. See dimension drawing on page 2.

Page 12

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Page 12
Image 12
Lennox International Inc Gas Units Setting an Upflow Unit, Furnace Locations Bottom Leveling Bolt, Nc‡
Page 11 Page 13

G61MP Series Units, Gas Units specifications

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One of the main features of the G61MP Series is its variable speed motor, which offers significantly enhanced comfort over traditional single-stage gas units. This technology allows for precise temperature control and improved humidity management. By adjusting its speed according to the heating demand, the unit minimizes temperature fluctuations, leading to a more consistent indoor climate.

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Safety is a paramount consideration in the design of the G61MP Series. These units are built with advanced safety features, including a self-diagnostic control system that continuously monitors the unit’s performance. This system alerts homeowners to any potential issues, allowing for proactive maintenance and ensuring the longevity of the equipment.

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In conclusion, Lennox International Inc.'s G61MP Series Gas Units deliver a combination of advanced technology, energy efficiency, and reliability, making them an excellent choice for homeowners looking to enhance their heating systems. With features designed to maximize comfort, minimize energy costs, and ensure safety, these units represent a significant advancement in residential heating solutions.
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