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R80ESN/R80ESL(Series A): Installation, Start–Up, Operating and Service and Maintenance Instructions
FURNACE
CASING
WIDTH
Upflow Applications on Combustible or Noncombustible Flooring
Downflow Applications on Noncombustible Flooring
14–3/16
(360)
Downflow Applications on Combustible Flooring
Downflow Applications on Combustible Flooring with Cased Coil
Upflow Applications on Combustible or Noncombustible Flooring
Downflow Applications on Noncombustible Flooring
17–1/2
(445)
Downflow Applications on Combustible Flooring
Downflow Applications on Combustible Flooring with Cased Coil
Upflow Applications on Combustible or Noncombustible Flooring
Downflow Applications on Noncombustible Flooring
21
(533)
Downflow Applications on Combustible Flooring
Downflow Applications on Combustible Flooring with Cased Coil
Upflow Applications on Combustible or Noncombustible Flooring
Downflow Applications on Noncombustible Flooring
24-1/2
(622)
Downflow Applications on Combustible flooring
Downflow Applications on Combustible Flooring with Cased Coil
WARNING
!
FIRE, EXPLOSION, AND CARBON MONOXIDE
POISONING HAZARD
Failure to follow this warning could result in personal injury, death,
and/or property damage.
Do not install the furnace on its back or hang furnace with control
compartment facing downward. Safety control operation will be
adversely affected. Never connect return-air ducts to the back of the
furnace.
HORIZONTAL INSTALLATION
The furnace can be installed horizontally in an attic or crawl space 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.
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.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Table 3 – Opening Dimensions - In. (mm)
APPLICATION
(subbase not required)
(subbase not required)
(subbase required)
(subbase not required)
(subbase not required)
(subbase not required)
(subbase required)
(subbase not required)
(subbase not required)
(subbase not required)
(subbase required)
(subbase not required)
(subbase not required)
(subbase not required)
(subbase required)
(subbase not required)
PLENUM OPENING
A
12-11/16
(322)
12-9/16
(319)
11-13/16
(284)
12-5/16
(319)
16
(406)
15-7/8
(403)
15-1/8
(384)
15-1/2
(394)
19-1/2
(495)
19-3/8
(492)
18-5/8
(473)
19
(483)
23
(584)
22-7/8
(581)
22-1/8
(562)
22-1/2
(572)
4. Reinstall bottom filler panel and screws. Side Return Air Inlet
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 side return air
inlet(s) is used without a bottom return air inlet.
Not all horizontal furnaces are approved for side return air connections
(see
Fig.
20).
FILTER ARRANGEMENT
!
CARBON MONOXIDE AND POISONING
HAZARD
Failure to follow this warning could result in personal injury, or death.
Never operate a furnace without a filter or with filter access door
removed.
There are no provisions for an internal filter rack in these furnaces.
A field-supplied accessory external filter is required.
Refer to the instructions supplied with the external filter rack for
assembly and installation options.
9
FLOOR OPENING
B
C
21-5/8
13-5/16
(549)
(338)
19
13-3/16
(483)
(335)
19
13-7/16
(483)
(341)
19
13-5/16
(483)
(338)
21-5/8
16-5/8
(549)
(422)
19
16-1/2
(483)
(419)
19
16-3/4
(483)
(425)
19
16-1/2
(483)
(419)
21-5/8
20-1/8
(549)
(511)
19
20
(483)
(508)
19
20-1/4
(483)
(514)
19
20
(483)
(508)
21-1/8
23-5/8
(537)
(600)
19
23-1/2
(483)
(597)
19
23-3/4
(483)
(603)
19
23-1/2
(483)
(597)
WARNING
D
22-1/4
(565)
19-5/8
(498)
20-5/8
(600)
20
(508)
22-1/4
(565)
19-5/8
(498)
20-5/8
(600)
20
(508)
22-1/4
(565)
19-5/8
(498)
20-5/8
(600)
20
(508)
22-1/4
(565)
19-5/8
(498)
20-5/8
(600)
20
(508)
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