Lennox International Inc ML193UH installation instructions Horizontal Suspension Kit

The ML193UH furnace can be installed in horizontal ap­ plications with either right- or left-hand air discharge.

Refer to figure 17 for clearances in horizontal applications.

HORIZONTAL SUSPENSION KIT
Metal Strap	Internal Brace
	(provided with kit)

Horizontal Application

Installation Clearances

Right-Hand Discharge

Left End

Air

Flow

Right End

Air

Flow

(typical)

Bracket

(typical)

Air

Flow

Bottom (Floor)**

Left-Hand Discharge

Top

Left End

Air

Flow

Right End

Air

Flow

FIGURE 18

	Bottom (Floor)**
Top		0
Front*		0
Back		0
Ends		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. **An 8” service clearance must be maintained below the unit to provide for servicing of the condensate trap.

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

FIGURE 17

Suspended Installation of Horizontal Unit

This furnace may be installed in either an attic or a crawl­ space. Either suspend the furnace from roof rafters or floor joists, as shown in figure 18, or install the furnace on a plat­ form, as shown in figure 19. A horizontal suspension kit (51W10) may be ordered from Lennox or use equivalent.

NOTE - Heavy-gauge sheet metal straps may be used to suspend the unit from roof rafters or ceiling joists. When straps are used to suspend the unit in this way, support must be provided for both the ends. The straps must not in­ terfere with the plenum or exhaust piping installation. Cool­ ing coils and supply and return air plenums must be supported separately.

NOTE - When the furnace is installed on a platform or with the horizontal suspension kit in a crawlspace, it must be elevated enough to avoid water damage, accommodate drain trap and to allow the evaporator coil to drain.

Platform Installation of Horizontal Unit

1 - Select location for unit keeping in mind service and other necessary clearances. See figure 17.

2 - Construct a raised wooden frame and cover frame with a plywood sheet. If unit is installed above finished space, fabricate an auxiliary drain pan to be installed under unit. Set unit in drain pan as shown in figure 19. Leave 8 inches for service clearance below unit for condensate trap.

3 - Provide a service platform in front of unit. When instal­ ling the unit in a crawl space, a proper support platform may be created using cement blocks.

4 - Route auxiliary drain line so that water draining from this outlet will be easily noticed by the homeowner.

5 - If necessary, run the condensate line into a conden­ sate pump to meet drain line slope requirements. The pump must be rated for use with condensing furnaces. Protect the condensate discharge line from the pump to the outside to avoid freezing.

6 - Continue with exhaust, condensate and intake piping installation according to instructions.

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