507270-03Page 12 of 60 Issue 1917
Removing the Bottom Panel
Remove the two screws that secure the bottom cap to the 
furnace. Pivot the bottom cap down to release the bottom 
panel. Once the bottom panel has been removed, reinstall 
the bottom cap. See Figure 16.
Figure 16. Removing the Bottom Panel
Horizontal Applications
Do not install the furnace  on  its  front  or  its back. See 
Figure 17.
 WARNING
Figure 17. 
This furnace can be installed in horizontal applications with 
either right or left hand air discharge.
Refer to Figure 18 for clearances in horizontal applications.
Figure 18. Horizontal Application
Installation Clearances
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.
‡ For installations on a combustible oor, do not install 
the furnace directly on carpeting, tile or other combustible 
materials other than wood ooring.
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 oor 
joists, as  shown  in Figure  19,  or install  the  furnace on  a 
platform, as shown in Figure 20. A horizontal suspension 
kit (51W10)  may  be  ordered  from your  distributor  or use 
equivalent.
Figure 19. Typical Horizontal Application