5
240011511 REV. C [05/31/2017]
WARNING
Fire hazard. Do not install furnace on tiled floors or
carpeting. Failure to follow these instructions could
result in death or serious injury.
!
5. Locating the Unit - [See Table 2]
•
Locate furnace so flue connection to chimney is short, direct
and consists of as few elbows as possible.
• Centralize furnace location with respect to supply and return
air ductwork. Central location minimizes trunk duct sizing.
•
All models may be installed on combustible floors.
•
Do not install furnace on carpet or tiled floors.
Table 2: Minimum Installation Clearance
s
Location
Clearance to Combustibles
LRF and LRFV
Top
1" (26mm)
Bottom
0"
Plenum
1" (26 mm)
Rear
6" (152 mm)*
Sides
1" (26 mm)**
Front
1" (26 mm) *
Flue Pipe
5" (127 mm)
Enclosure
Closet
* 24" (610 mm) Service Clearance
** 18" (457 mm) required from on side for access to rear
Maintain all clearances to combustibles. See Table 2.
6. Furnace Used In Conjunction With Air
Conditioning
• Install furnace in parallel with or upstream from evaporator
coil to avoid condensation in heat exchanger.
• When installed in parallel, prevent chilled air from entering
furnace by use of dampers or other air controlling means.
• Manually operated dampers must have a control to prevent
operation of either system unless dampers are in full heat or
full cool position.
• Air heated by the furnace shall not pass through evaporator
coil unless coil is specifically approved for such service.
• Check and adjust blower speed to compensate for pressure
drop caused by evaporator coil.
• Maintain required clearance between bottom of coil drain pan
and top of heat exchanger as specified by coil manufacturer.
• Cased evaporator coils with cases that are slightly larger
than the furnace cabinet may be used by employing field
fabricated block off plates to close gap between furnace
cabinet and coil casing. See Figures 1a and 1b.
• Cased evaporator coils with cases that are smaller than
the furnace cabinet should not be used as they will restrict
airflow.
FIGURE 1b: Evaporator Coil Centered Over
Narrow Furnace
FIGURE 1a: Evaporator Coil
Block-Off Plates
