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Settingan UpflowUnit
Whenthesidereturnairinletsareusedin an upflow ap-
plication, itmaybenecessary toinstall shims onthebottom
ofthefurnace. I f desired, u sefield-supplied c orrosion-re-
sistant 5 /16inchmachine bolts(4)andnuts(8)tolevel t he
furnace, S eefigure8,
NOTE - The maximum length of the bolt is 1-1/2 inches.
1 - Lay the furnace on its back and drill a 5/16 inch diame-
ter hole in each corner of the furnace's bottom, See fig-
ure 8 for the correct location of the holes, Drill through
the bottom panel and the bottom flange of the cabinet.
2 - Install one bolt and two nuts into each hole. Screw the
first nut onto a bolt and then insert the bolt into a hole. A
flat washer may be added between the nut and the bot-
tom of the unit.
3 - Screw another nut onto the bolt on the inside of the fur-
nace base. A flat washer may be added between the
nut and the bottom of the unit,
4 - Adjust the outside nut to the appropriate
height and
tighten the inside nut to secure the arrangement,
Leveling
Bolt Installation
Inches (mm)
3/8
Furnace Front
_¢
3/8
1-3/4
(44)
1-3/4
(44)
Leveling
Bolt
Locati,
Furnace
Bottom
Leveling
Bolt
Locations
3/8
(10)
3/8
1-3/4
(10)
(44)
I-3/4 (44)
FIGURE 8
Downflow
Applications
The unit may be installed three ways in downflow applica-
tions: on non-combustible flooring, on combustible flooring
using an additive base, or on a reverse-flow cooling coil
cabinet. Do not drag the unit across
the floor in the
downflow
position.
Flange damage will result.
Refer to figure 9 for clearances
in downflow
applica-
tions.
Downflow Application Installation Clearances
Top
Left Side
_
Right Side
Boffom
Top
0
*Front
0
Back
0
Sides
0t
Vent
0
Floor
NC$
*Front clearance
in alcove
installation
must be 24 in. (610 ram).
Maintain a minimum of 24 in. (610 ram) for front service access.
tAllow
proper clearances
to accommodate
condensate
trap and
vent pipe installation.
SThe furnace may be installed on a combustible
wood floor if an
optional additive
base is installed
between the furnace and the
combustible floor.
FIGURE 9
Installation on Non-Combustible
Flooring
1 - Cut floor opening keeping in mind clearances listed on
unit rating plate. Also keep in mind gas supply connec-
tions, electrical supply, flue and air intake connections
and sufficient installation and servicing clearances,
See table 1 for correct floor opening size.
2 - Flange warm air plenum and lower the plenum into the
opening.
3 - Set the unit over the plenum and seal the plenum to
the unit,
4 - Ensure that the seal is adequate,
TABLE
1
NON-COMBUSTIBLE
FLOOR
Front to Rear
Model No.
mm
B Cabinet
(17.5")
502
C Cabinet (21")
502
D Cabinet
(24.5")
502
in.
19 - 3/4
19 - 3/4
19 - 3/4
)PENING
SIZE
Side to Side
in.
mm
16 - 5/8
422
20-1/8
511
23 - 5/8
600
NOTE - Floor opening dimensions listed are 1/4 inch (6 mm) larger than
the unit opening. See dimension drawing on page 2.
Page 9
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