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General
 WARNING
This prodcut contains a chemical known to the State 
of California to cause cancer, birth defects, or other 
reproductive harm.
 CAUTION
SLP98DFV unit should not be installed in areas normally 
subject to freezing temperatures.
These instructions are intended as a general guide and do 
not supersede local codes in any way. Consult authorities 
having jurisdiction before installation.
In addition to the requirements outlined previously, the 
following general recommendations must be considered 
when installing a SLP98DFV furnace:
•    Place the furnace as close to the center of the air 
distribution system as possible. The furnace should 
also be located close to the chimney or vent termi-
nation point.
•   When the furnace is installed in an attic or other 
insulated space, keep insulation away from the fur-
nace.
•   When the furnace is installed in an unconditioned 
space, consider provisions required to prevent 
freezing of condensate drain system.
Installation - Setting Equipment
 WARNING
Do not install the furnace on its front, back or in the 
horizontal  position.  See  gure  5.  Do  not  connect  the 
return air ducts to the back of the furnace. Doing so 
will adversely affect the operation of the safety control 
devices, which could result in personal injury or death.
Select a location that allows for the required clearances 
that are listed on the unit nameplate. Also consider gas 
supply connections, electrical supply, vent connection, 
condensate trap and drain connections, and installation 
and service clearances [24 inches (610 mm) at unit front]. 
The unit must be level from side to side. Unit may be posi-
tioned from level to 1/2” toward the front to aid in draining. 
See gure 4.
SETTING EQUIPMENT
FRONT VIEW SIDE VIEW
AIR FLOW
AIR FLOW
1/2”
AIR FLOW
SIDE VIEW
Unit must be level side-to-side. Unit may be positioned
from level to 1/2” toward the front to aid in draining.
FIGURE 4 
Front
NOTE - Do not install the furnace on its front, back or in the horizontal position
Back
Horizontal
FIGURE 5