58SB0B/58SB1B: Installation, Start–Up, Operating and Service and Maintenance Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
10
3. Install another nut on other side of furnace base. (Install flat washer
if desired.)
4. Adjust outside nut to provide desired height, and tighten inside nut
to secure arrangement.
5. Reinstall bottom closure panel if removed.
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:
• Manufacturer’s approved downflow combustible floor subbase
• Manufacturer’s approved cased evaporator coil
• Manufacturer’s approved evaporator coil casing
1. Determine application being installed from Table 4.
2. Construct hole in floor (see Table 4 and Fig. 11).
3. Construct plenum to dimensions specified (see Table 4 and Fig. 11).
4. If downflow subbase is used, install as shown in Fig. 12. If
manufacturer’s cased evaporator coil or coil casing is used, install
as shown in see Fig. 13.
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. 17) in the “Air Ducts” section.
A96283
Fig. 11 – Floor and Plenum Opening Dimensions
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. 9).
2. Rotate bottom filler panel downward to release holding tabs.
3. Remove bottom closure panel.
4. Reinstall bottom filler panel and screws
A96285
Fig. 12 – Furnace, Plenum, and Subbase Installed on a
Combustible Floor
A08556
Fig. 13 – Furnace, Plenum, and Coil Assembly or
Coil Box Installed on a Combustible Floor
CAUTION
!
EQUIPMENT OR PROPERTY DAMAGE
Failure to follow this caution could result in equipment or property
damage
When furnace is installed in a downflow application, make sure water
lines and other sources of water cannot drip or fail in such a way that
water can collect on the blower motor, wiring, and furnace control
board.
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