Carrier 58DHL - Manual (Page 3)

Fig. 7—Furnace, Plenum, and
Base Installed on a Combustible Floor
2 .
3.
Cut and frame hole in floor per dimensions in Table 1 of
Installation Instructions packaged with combustible
floor base. If this requires cutting of a floor joist, tie
ends of cut joist into adjacent joists so that proper
floor support wül be maintained.
Assemble and install combustible floor base per
instructions packaged with base.
4. When completed, combustible floor base, plenum, and
furnace (or coil casing when used) should be installed as
shown in Fig. 7.
VI. HORIZONTAL ATTIC INSTALLATION
A WARNING
Do not install the furnace on its back. Fusible link oper­
ation will be adversely affected. Never connect return-
air ducts to the sides or back of the furnace. A failure to
adhere to this warning can cause a fire, physical injury,
or death.
LINE CONTACT ONLY PERMISSIBLE BETWEEN
LINES FORMED BY INTERSECTIONS OF
THE TOP AND TWO SIDES OF THE FURNACE
JACKET AND BUILDING JOISTS.
STUDS OR FRAMING.'
The furnace can be installed horizontally on either the LH
or RH side. A typical attic installation is shown in Fig. 8.
NOTE;
The National Fuel Gas Code requires the use of a
t
5
q>e B1 vent in an attic or concealed space.
A. Construct a working platform.
1. Place working platform in location where all required
furnace clearances are obtainable. See Table 1.
2. Use materials in platform that will support installer
and service persons.
3. Secure platform to building joists.
B. Install furnace
1. Position furnace in desired location.
2. Connect gas supply pipe. See Fig. 8 for typical piping
entry. It is important to install a sediment trap in the
gas pipe riser.
3. Connect supply- and return-air ducts.
a. Install field-supplied duct flanges as shown in
Fig. 9.
b. Using appropriate fasteners for type of supply-air
duct being used, connect duct to furnace.
c. Install field-supphed filter retainers as indicated in
Fig. 10 and Table 5 before coimecting return-air
duct to furnace.
NOTE:
For ease of servicing, a return-air filter can be
installed in a common return-air grille. The air velocity rat­
ing must not exceed 300 ft/min for disposable filters. The air
velocity through permanent-type filters shall not exceed the
mEuiufacturer’s recommendation.
d. Using appropriate fasteners for type of duct being
used, connect return-air duct to furnace.
4. Install 24-x24-in. sheet metal shield on platform in
front of louvered control panel, as shown in Fig. 8.
VII. CRAWL SPACE INSTALLATION
The furnace can be installed horizontally with either the LH
or RH side up. In a crawl space, the furnace can either be
hung from the floor joist or installed on suitable blocks or
pad. The furnace can be suspended from each corner by
SEDIMENT TRAP
Fig. 8—Typical Attic installation