Filter Arrangement; Leveling Legs (If Required); Gas Piping - Carrier 58UXT Installation, Start-Up, And Operating Instructions Manual

LINE CONTACT ONLY PERMISSIBLE BETWEEN
LINES FORMED BY INTERSECTIONS OF
THE TOP AND TWO SIDES OF THE FURNACE
JACKET, BUILDING JOISTS,
STUDS, OR FRAMING.
FLUE VENT
sheet metal shield in front of the louvered control panel is covered
in Horizontal Attic Installation. For a crawlspace installation, this
same sheet metal shield must be installed above the louvered
control panel. Extend the sheet metal shield over furnace top far
enough to cover gas pipe entry hole.
Step 6—Filter Arrangement
Never operate unit without a filter or with filter access door
removed. A failure to follow this warning can cause a fire,
personal injury, or death.
The factory-supplied filter(s) is shipped in the blower compart-
ment. Determine location for the filter and move filter retaining
hardware, if necessary, before attaching the return-air duct. After
the return-air duct has been connected to the furnace, install the
filter(s) inside the furnace blower compartment. See Fig. 7 for side
return application and Fig. 8 for bottom return application.
A bottom closure panel is factory installed in the bottom of the
furnace. When bottom return inlet is desired, remove and discard
the enclosure panel.
Filter retaining brackets, supports, and retainers are factory as-
sembled and shipped installed for side return application, with 1
set of all required hardware on each furnace. (See Fig. 7.)
For bottom return applications, remove the front and back brackets
and supports from each side. The back bracket(s) are installed in
the rear of the furnace casing. Dimples are provided to mark
mounting screw locations.
The front bracket(s) are installed on the bottom front plate, as
shown in Fig. 8, once the bottom enclosure has been removed.
Rotate filter supports 180° so filter will rest on support and
reinstall. Install small U-shaped end of filter retaining rod in the
rear bracket. Install the front of filter retainer rod as shown in Fig.
8. Two sets of hardware are needed for furnaces in 24-1/2 in.
casings using 2 filters for bottom return. All hardware is provided
for filter installation.
Step 7—Leveling Legs (If Required)
When the furnace is used with side inlet(s) and leveling legs are
required, refer to Fig. 9 and install field-supplied, corrosion-
resistant 5/16-in. machine bolts and nuts.
GAS
ENTRY
I N
6 " M
SHEET
METAL
CLEARANCE
TO COMBUSTABLE
MATERIALS
Fig. 4—Horizontal Attic Installation
MANUAL SHUTOFF
GAS VALVE
30-IN. MIN
WORK AREA
24"
24"
SEDIMENT TRAP
NOTE: The length of the bolt should not exceed 1-1/2 in.
1. Lay furnace on its back. Locate and drill 5/16-in. diameter
hole in each bottom corner of furnace as shown in Fig. 9.
2. Install nut on bolt and install bolt with nut in hole. (Install flat
washer if desired.)
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.
Step 8—Gas Piping
Emissions control devices located at heat exchanger inlets
MUST be removed for propane installations. (Refer to gas
conversion kit for instructions.)
Gas piping must be installed in accordance with national and local
codes. Refer to the NFGC in U.S. Canadian installations must be
installed in accordance with NSCNGPIC and all authorities having
jurisdiction.
The gas supply line should be a separate line running directly from
the gas meter to the furnace, if possible. Refer to Table 4 for the
recommended gas pipe size. Risers must be used to connect to the
furnace and the meter.
If a flexible connector is required or allowed by the authority
having jurisdiction, black iron pipe shall be installed at
furnace gas control valve and extend a minimum of 2 in.
outside the furnace casing. A failure to follow this warning
could result in fire, personal injury, or death.
Piping should be pressure tested in accordance with local and
national plumbing and gas codes BEFORE the furnace has been
attached. If the test pressure exceeds 0.5 psig (14-in. wc), the gas
supply pipe must be disconnected from the furnace and capped
before the pressure test. If the test pressure is equal to or less than
0.5 psig (14-in. wc), close the manual shut-off valve before the
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