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Installer's Guide
The Furnace may be placed horizontally in a crawl
space on a pad or other noncombustible material which
will raise the unit for sufficient protection from mois-
ture.
The Furnace must be supported at both ends and
the middle when installed horizontally. The
Furnace must also be elevated approximately 4-6
inches to allow clearance for the condensate drain
to exit the cabinet in the horizontal position.
The horizontal Furnace may also be suspended from
the joists using all-thread rods with a substantial metal
support frame that supports the entire length of the
furnace. The rods need to be of sufficient length to
allow for proper clearances from combustible materials.
The frame needs to be at least 32" in length to allow for
access to service panels.
If the Furnace is suspended using steel strap, it must be
supported at all four corners and in the middle at the
front of the Furnace.
NOTE:
No
sheet-
metal screws may be
used from 0-4" from
the bottom of the
unit. Screws will in-
terfere with the air
cleaner.
Figure 4
NOTE: Do NOT install screws to the bottom of the
unit except with Duct Flanges and Screws provided.
GUIDE FOR THE INSTALLATION OF DUCT FLANGES
▲
!
Failure to use pre-drilled holes and the factory
provided screws can potentially damage air cleaner
components.
Materials
•
Duct Flanges
Two 23.5" Flanges
Two Additional Flanges
15.92" (for 17.5" cabinet)
19.42" (for 21" cabinet)
21.92" (for 24.5" cabinet)
•
Screws
Eight 5/16" Blunt Tip Screws with 5/16" Hex
Head
Steps
1. See Figures 5, 6, and 7 for flange orientation.
8
"
CAUTION
2. Attach flanges 1, 2, and 3 (Fig 7) to the unit using
the factory provided screws and the pre-drilled
holes in the wrapper. Flanges 1 and 2 are the
23.5" flanges that are generic to all units. Flange
3 will be one of two short flanges and the length
of which is dependent on the cabinet size.
3. Attach flange 4 (Fig 7) to the duct work (Flanges
should be inside duct work). Flange 4 is the
remaining short flange.
4. Place duct work with single flange over the
flanges that are currently attached to the unit
5. Attach duct work to remaining 3 flanges.
6. Attach the front flange from step 3 to the unit by
drilling 1/8" holes into the bottom channel. Use
the factory provided 5/16" blunt tip screws to
attach.
7. Use field supplied material to make an adequate
seal.
DO NOT use silicon based sealant in the
airstream.
Figure 5: Horizontal Left
Use pre-drilled
holes
Figure 6: Bottom View - Pre-drilled holes
Use pre-
drilled
holes
1
3
4
2
Use pre-
drilled
holes
18-CD25D1-2
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