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987MB: Installation, Start-up, Operating and Service and Maintenance Instructions
FURNACE
CASING
WIDTH
IN. (mm)
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 Coil Assembly
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 Coil Assembly
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 Coil Assembly
CAUTION
!
CUT HAZARD
Failure to follow this caution may result in personal injury.
Sheet metal parts may have sharp edges or burrs. Use care and wear
appropriate protective clothing, safety glasses and gloves when
handling parts, and servicing furnaces.
Connect supply-air duct to supply-air outlet on furnace. Bend flange
inward past 90° with wide duct pliers, see
must be connected to ONLY the furnace supply outlet or air conditioning
coil casing (when used). When installed on combustible material,
supply-air duct must be connected to ONLY the factory-approved
accessory subbase, or a factory-approved air conditioning coil casing.
DO NOT cut main furnace casing to attach supply side air duct,
humidifier, or other accessories. All supply-side accessories MUST be
connected to duct external to furnace casing.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Table 5 – Opening Dimensions - In. (mm)
APPLICATION
(subbase not required)
(subbase not required)
(subbase required)
or coil box (subbase not required)
(subbase not required)
(subbase not required)
(subbase required)
or coil box (subbase not required)
(subbase not required)
(subbase not required)
(subbase required)
or coil box (subbase not required)
A
PLENUM
OPENING
B
D
FLOOR
OPENING
C
Fig. 24 – Installation on Combustible Flooring
Fig.
19. The supply-air duct
PLENUM OPENING
A
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)
FURNACE
(OR COIL CASING
WHEN USED)
COMBUSTIBLE
FLOORING
DOWNFLOW
SUBBASE
SHEET METAL
PLENUM
FLOOR
OPENING
Return Air Connections
!
FIRE HAZARD
A failure to follow this warning could cause personal injury, death
and/or property damage.
Never connect return-air ducts to the back of the furnace. Follow
instructions below.
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.
Supply Air Connections
For a furnace not equipped with a cooling coil, the outlet duct shall be
provided with a removable access panel. This opening shall be
accessible when the furnace is installed and shall be of such a size that
the heat exchanger can be viewed for possible openings using light
assistance or a probe can be inserted for sampling the air stream. The
cover attachment shall prevent leaks.
16
FLOOR OPENING
B
C
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)
FURNACE
APPROVED
COIL ASSEMBLY
OR
COIL BOX
COMBUSTIBLE
FLOORING
SHEET METAL
PLENUM
FLOOR
OPENING
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)
A10491
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