Lennox International Inc Gas Units, G61MP Series Units Upflow Applications

Upflow Applications

The G61MP gas furnace can be installed as shipped in the upflow position. Refer to figure 8 for clearances.

Installation Clearances
	Top
Left Side	Right Side
	Bottom (Floor)
Top/Plenum	1 in. (25 mm)
*Front	0
Back	0
Sides	0†

Vent	0
Floor	0‡

*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.

‡For installations on a combustible floor, do not install the furnace directly on carpeting, tile or other combustible materials other than wood flooring.

FIGURE 8

Return Air −− Upflow Units

Return air can be brought in through the bottom or either side of the furnace installed in an upflow application. If the furnace is installed on a platform with bottom return, make an airtight seal between the bottom of the furnace and the platform to ensure that the furnace operates properly and safely. The furnace is equipped with a removable bottom panel to facilitate installation.

Markings are provided on both sides of the furnace cabinet for installations that require side return air. Cut the furnace cabinet at the maximum dimensions shown on page 2.

NOTE − When air volumes over 1800 cfm (850 L/s) are required with 60C or 60D models in an upflow applica- tion, the following return air options are available:

1 − Return air from single side with transition which will accommodate 20 x 25 x 1 in. (508 x 635 x 25 mm) air filter. (Required to maintain proper air velocity.) See figure 10.

2 − Return air from single side with optional RAB Return Air Base. See figure 9.

3 − Return air from bottom.

4 − Return air from both sides.

5 − Return air from bottom and one side.

Refer to Engineering Handbook for additional information.

Page 10