Horizontal Attic Installation; Horizontal Crawlspace Installation; Filter Arrangement; Leveling Legs (If Required) - Carrier 58UHV Installation, Start-Up, And Operating Instructions Manual

1. Position furnace in desired location.
2. Connect gas supply pipe.
3. Connect supply- and return-air ducts.
Step 2—Horizontal Attic Installation
Do not install the furnace on its back; safety control operation
will be adversely affected. Never connect return-air ducts to
the sides or back of the furnace. A failure to follow this
warning could result in fire, personal injury, or death.
The furnace can be installed horizontally with either the left-hand
(LH) or right-hand (RH) side down. A typical attic installation is
shown in Fig. 4.
CONSTRUCT A WORKING PLATFORM
Construct working platform on location where all required
furnace clearances are met. (See Table 1 and Fig. 4.)
INSTALL FURNACE
1. Position furnace in desired location.
2. Connect gas supply pipe. See Fig. 4 for typical piping entry.
3. Connect supply- and return-air ducts.
4. Install 24- X 24-in. sheet metal shield on platform in front of
louvered control panel as shown in Fig. 4.
Step 3—Horizontal Crawlspace Installation
The furnace can be installed horizontally with either the LH or RH
side down. In a crawlspace, the furnace can either be hung from
the floor joist (See Fig. 5) or installed on suitable blocks or pad.
(See Fig. 6.) The furnace can be suspended from each corner by
hanger bolts (4 each 3/8-in. all-thread rod) cut to desired length.
Use 1- X 3/8-in. flat washer, 3/8-in. lockwasher, and 3/8-in. nuts
on hanger rods. (See Fig. 5.) Dimples are provided for hole
locations. (See Fig. 1.)
Fig. 6—Horizontal Installation on Blocks
Since the horizontal crawlspace installation is very similar to the
attic, refer to Attic Installation section. The installation of a sheet
metal shield in front of the louvered control panel is covered in
Attic Installation section. For a crawlspace installation, this same
sheet metal shield must be installed above the louvered control
panel. Extend the sheet metal shield over the furnace top far
enough to cover the gas pipe entry hole.
Step 4—Filter Arrangement
Never operate unit without a filter or with filter access door
removed. A failure to follow this warning could result in fire,
personal injury, or death.
The factory-supplied filter(s) are 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.)
FILTER
RETAINER
Fig. 7—Side Filter Arrangement
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 side 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 the 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.
A95235
Fig. 8—Bottom Filter Arrangement
Step 5—Leveling Legs (If Required For Upflow)
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.
7
WASHABLE
FILTER
A95284
A93046