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R80ESN/R80ESL(Series A): Installation, Start–Up, Operating and Service and Maintenance Instructions
INSTALLATION
UPFLOW INSTALLATION
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 two screws holding bottom filler
panel (see
Fig.
8).
2. Rotate bottom filler panel downward to release holding tabs.
3. Remove bottom closure panel.
4. Reinstall bottom filler panel and screws.
Bottom
Closure Panel
Bottom Filler Panel
Fig. 8 – 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 3 accessories are
used:
• Downflow combustible floor subbase
• Cased Coil numbers END4X, 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 shown (see
model number END4X, ENW4X or Coil Casing model number
NAEA is used, install as shown (see
NOTE: It is required 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.
16) 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 two screws holding bottom filler
panel (see
Fig.
8).
2. Rotate bottom filler panel downward to release holding tabs.
3. Remove bottom closure panel.
4. Reinstall bottom filler panel and screws
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Table
3.
Table 3
and
Fig.
9).
Table 3
and
Fig.
10). If Coil
Fig.
11).
Fig. 9 – Floor and Plenum Opening Dimensions
A10273
Fig. 10 – Furnace, Plenum, and Subbase Installed on a
Fig.
9).
Fig. 11 – Furnace, Plenum, and Coil Assembly or
8
A
PLENUM
OPENING
B
D
FLOOR
OPENING
C
FURNACE
(OR COIL CASING
WHEN USED)
COMBUSTIBLE
FLOORING
DOWNFLOW
SUBBASE
SHEET METAL
PLENUM
FLOOR
OPENING
Combustible Floor
FURNACE
APPROVED
COIL ASSEMBLY
OR
COIL BOX
COMBUSTIBLE
FLOORING
SHEET METAL
PLENUM
FLOOR
OPENING
Coil Box Installed on a Combustible Floor
A96283
A96285
A08556
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