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

2 screws through the casing side and into the filler strip to secure
it in place. Filter should rest on the top of the filler strip when
installed.
Never operate unit without a filter or with filter access door
removed. Failure to follow this warning can cause fire,
personal injury, or death.
Step 3—Leveling Legs (If Required)
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
⁄
"
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.
"
16
"
3
1 ⁄
4
"
5
⁄
16
"
A89014
Step 4—Gas Piping
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
gas valve and extend a minimum of 2 in. outside the furnace
casing.
Table 4—Maximum Capacity of Gas Pipe*
NOMINAL INTERNAL
IRON PIPE DIAMETER
SIZE (IN.) (IN.)
1/2 0.622
3/4 0.824
1 1.049
1-1/4 1.380
1-1/2 1.610
* Cubic ft of gas per hr for gas pressures of 0.5 psig (14-in. wc) or less, and a
supply line pressure drop of 0.5-in. wc (based on a 0.60 specific gravity gas).
Ref: Table 10-2, NFPA 54–1999.
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), the gas supply pipe
must be disconnected from the furnace and capped before pressure
test. If test pressure is equal to or less than 0.5 psig (14-in. wc),
turn OFF electric shutoff switch before test. (See Fig. 10.) It is
recommended that the ground joint union be loosened before
pressure testing. After all connections have been made, purge lines
and check for leakage with regulated gas supply pressure.
Install a sediment trap in riser leading to furnace. The trap can be
installed by connecting a tee to riser leading from the furnace.
Connect a capped nipple into lower end of the tee. The capped
nipple should extend below level of gas controls. (See Fig. 11.)
Apply joint compound (pipe dope) sparingly and only to male
threads of each joint. The compound must be resistant to action of
propane gas.
Install an accessible manual shutoff valve upstream of furnace gas
controls and within 72 in. of 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, acces-
sible for test gage connection, installed immediately upstream of
gas supply connection to furnace and downstream of manual
shutoff valve, is not required. Place ground joint union between
gas control manifold and manual shutoff valve.
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.
8
LENGTH OF PIPE (FT)
10 20 30 40
175 120 97 82
360 250 200 170
680 465 375 320
1400 950 770 660
2100 1460 1180 990
50
73
151
285
580
900