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F80CTL and G80CTL: Installation, Start–Up, Operating and Service and Maintenance Instructions
Bottom
Closure Panel
Bottom Filler Panel
Fig. 9 – Removing Bottom Closure Panel
Side Return Air Inlet
These furnaces are shipped with bottom closure panel installed in bottom
return-air opening. This panel MUST be in place when only side return
air is used.
NOTE: Side return-air openings can be used in UPFLOW and most
HORIZONTAL configurations. Do not use side return-air openings in
DOWNFLOW configuration.
DOWNFLOW INSTALLATION
NOTE: For downflow applications, this furnace is approved for use on
combustible flooring when any one of the following accessories are
used:
•Downflow combustible factory-approved floor subbase
•Coil model numbers EAM4X, EDM4X, EMA4X, END4X or ENW4X
•Coil casing model number NAEA
1. Determine application being installed from
2. Construct hole in floor, see
3. Construct plenum to dimensions specified, see
4. If downflow subbase is used, install as, see
numbers END4X, ENW4X or coil casing model number NAEA are
used, install as, see
Fig.
12.
NOTE: It is recommended that the perforated supply-air duct flanges be
completely folded over or removed from furnace when installing the
furnace on a factory-supplied cased coil or coil box. To remove the
supply-air duct flange, use wide duct pliers or hand seamers to bend
flange back and forth until it breaks off. Be careful of sharp edges. Refer
to Duct Flanges
(Fig.
17) in the "Air Ducts" section.
Bottom Return Air Inlet
These furnaces are shipped with bottom closure panel installed in bottom
return-air opening. Remove and discard this panel when bottom return
air is used. To remove bottom closure panel, perform the following:
1. Tilt or raise furnace and remove 2 screws holding bottom filler
panel,
Fig.
9.
2. Rotate bottom filler panel downward to release holding tabs.
3. Remove bottom closure panel.
4. Reinstall bottom filler panel and screws.
Fig. 10 – Floor and Plenum Opening Dimensions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Table
3.
Table 3
and
Fig.
10.
Table 3
and
Fig.
11. If coil model
A
PLENUM
OPENING
B
D
FLOOR
OPENING
C
A10273
Fig. 11 – Furnace, Plenum, and Subbase Installed on a Combustible
Fig.
10.
Fig. 12 – Furnace, Plenum, and Coil Assembly or Coil Box Installed
HORIZONTAL INSTALLATION
The furnace can be installed horizontally in an attic or crawlspace on
either the left-hand (LH) or right-hand (RH) side. The furnace can be
hung from floor joists, rafters or trusses or installed on a
non-combustible platform, blocks, bricks or pad.
Suspended Furnace Support
The furnace may be supported under each end with threaded rod, angle
iron or metal plumber's strap as shown, see
angle iron to bottom of furnace as shown. Heavy-gauge sheet metal
straps (plumber's straps) may be used to suspend the furnace from each
bottom corner. To prevent screws from pulling out, use 2 #8 x in. screws
into the side and 2 #8 x in. screws in the bottom of the furnace casing for
each strap, see
Fig. 14
If the screws are attached to ONLY the furnace sides and not the bottom,
the straps must be vertical against the furnace sides and not pull away
from the furnace sides, so that the strap attachment screws are not in
tension (are loaded in shear) for reliable support.
Platform Furnace Support
Construct working platform at location where all required furnace
clearances are met, see
mm) clearance requirement on side, set furnace on non-combustible
blocks, bricks or angle iron. For crawlspace installations, if the furnace
A96283
is not suspended from the floor joists, the ground underneath furnace
must be level and the furnace set in blocks or bricks.
9
FURNACE
(OR COIL CASING
WHEN USED)
COMBUSTIBLE
FLOORING
DOWNFLOW
SUBBASE
SHEET METAL
PLENUM
FLOOR
OPENING
Floor
FURNACE
APPROVED
COIL ASSEMBLY
OR
COIL BOX
COMBUSTIBLE
FLOORING
SHEET METAL
PLENUM
FLOOR
OPENING
on a Combustible Floor
Fig. 14
and
and
Fig.
15.
Fig. 2
and
Fig.
13. For furnaces with 1-in. (25
A96285
A08556
Fig.
15. Secure
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