Gas Piping - Carrier 58TUA Installation, Start-Up, And Operating Instructions Manual

1. Lay furnace on its back. Locate and drill 5/16-in. diameter
hole in each bottom corner of furnace as shown in Fig. 7.
2. Install nut on bolt and install bolt and 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.
"
5
⁄
16
5
⁄
"
3
1 ⁄
4
"
5
⁄
16
"
3
1 ⁄
4
3
1 ⁄
4
Fig. 7—Leveling Leg Installation
Step 7—Gas Piping
Gas piping must be installed in accordance with national and local
codes. Refer to the NFGC NFPA 54-1996/ANSI Z223.1-1996.
Canadian installations must be installed in accordance with NSC-
NGPIC 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
recommended gas pipe size. Risers must be used to connect to
furnace and 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 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 54-1996.
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
"
16
"
3
1 ⁄
4
"
5
⁄
16
"
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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
GAS
SUPPLY
MANUAL
SHUTOFF
VALVE
(REQUIRED)
SEDIMENT
TRAP
UNION
Fig. 8—Typical Gas Pipe Arrangement
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. 7.) 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. 8.)
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 and adequate piping support 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.
50
73
151
Use a backup wrench at the furnace gas control when
285
connecting the gas pipe to the furnace to avoid damaging gas
580
controls or manifold.
900
8
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