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

Fig. 9—Horizontal Furnace Installation on Blocks
Since horizontal furnace crawlspace installation is very similar to
attic, refer to Horizontal Furnace Attic Installation section. The
installation of a sheet metal shield in front of the louvered control
panel is covered in Horizontal Furnace Attic Installation section.
For a crawlspace installation, this same sheet metal shield must be
installed above the louvered control panel. Extend sheet metal
shield over furnace top far enough to cover gas pipe entry hole.
Step 4—Leveling Legs (If Required For Upflow)
When furnace is used with side inlet(s) and leveling legs are
required, refer to Fig. 10 and install field-supplied, corrosion-
resistant 5/16-in. machine bolts and nuts.
NOTE: The length of the bolt should not exceed 1-1/2 in.
"
5
⁄
16
5
⁄
16
"
3
1 ⁄
4
"
5
⁄
16
"
3
1 ⁄
4
"
3
1 ⁄
4
Fig. 10—Leveling Leg Installation
1. Lay furnace on its back. Locate and drill 5/16-in. diameter
hole in each bottom corner of furnace as shown in Fig. 10.
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.
A95235
"
"
3
1 ⁄
4
"
5
⁄
16
A89014
Step 5—Gas Piping
Emissions control devices located at the 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. Canadian installations must be installed
in accordance with NSCNGPIC and all authorities having juris-
diction.
The gas supply line should be a separate line running directly from
gas meter to furnace, if possible. Refer to Table 4 for recom-
mended gas pipe size. Risers must be used to connect furnace to
gas meter.
If a flexible connector is required or allowed by the authority
having jurisdiction, black iron pipe shall be installed at the
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.
Use the proper length of pipes to avoid stress on the gas
control manifold. A failure to follow this warning can cause
a gas leak resulting in a fire, explosion, personal injury, or
death.
Use a backup wrench at the furnace gas control when
connecting the gas pipe to the furnace to avoid damaging gas
controls or manifold.
Never purge a line into a combustion chamber. Never use
matches, candles, flame, or other sources of ignition for the
purpose of checking leakage. Use a soap-and-water solution
to check for leakage. A failure to follow this warning can
cause a fire, explosion, personal injury, or death.
Install a sediment trap in the riser leading to the furnace. The trap
can be installed by connecting a tee to the riser leading from the
furnace. Connect a capped nipple into the lower end of the tee. The
capped nipple should extend below the level of the gas controls.
(See Fig. 11.)
Apply joint compound (pipe dope) sparingly and only to the male
threads of each joint. The compound must be resistant to the action
of propane gas.
Install an accessible manual shutoff valve upstream of the furnace
gas controls and within 72 in. of the furnace. A 1/8-in. NPT
plugged tapping is provided on the gas valve for test gage
connection. Installation of an additional 1/8-in. NPT plugged
tapping, accessible for test gage connection, installed immediately
upstream of the gas supply connection to the furnace and down-
stream of the manual shutoff valve, is not required. Place ground
joint union between the gas control manifold and the manual
shutoff valve.
Piping should be pressure tested in accordance with local and
national plumbing and gas codes BEFORE furnace has been
attached. If test pressure exceeds 0.5 psig (14-in. wc), gas supply
pipe must be disconnected from furnace and capped before
9