Gas Piping; Electrical Connections; 115-V Wiring - Carrier 58GFA Installation, Starting-Up And Operation Manual

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 5—Gas Piping
Gas piping must be installed in accordance with national and local
codes. Refer to the current edition of the NFGC. 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.
Table 4—Maximum Capacity of Pipe*
NOMINAL IRON INTERNAL
PIPE SIZE (IN.) DIAMETER (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
pressure drop of 0.5-in. wc (based on a 0.60 specific gravity gas). Ref: Table
C-2 NFPA 54-1992.
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.
Piping should be pressure tested in accordance with local and
national plumbing and gas codes before the furnace has been
attached. If the 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 located on the
gas valve before the test. It is recommended that the ground joint
union be loosened before pressure testing. After all connections
have been made, purge the lines and check for leakage with
regulated gas supply pressure.
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. 7.)
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.
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. Failure to follow this warning can cause
fire, explosion, personal injury, or death.
Install accessible manual shut-off valve upstream of the furnace
gas controls and within 72 in. of the furnace. A 1/8-in. NPT
plugged tapping, accessible for test gage connection, must be
installed immediately upstream of the gas supply connection to the
furnace and downstream of the manual shut-off valve. Place
ground joint union between the gas control manifold and the
manual shut-off valve.
LENGTH OF PIPE (FT)
10 20 30 40 50
175 120 97 82 73
360 250 200 170 151
680 465 375 320 285
1400 950 770 660 580
2100 1460 1180 990 900
Fig. 7—Typical Gas Pipe Arrangement
Use the proper length of pipes to avoid stress on the gas
control manifold. Failure to follow this warning can cause a
gas leak resulting in fire, explosion, personal injury, or death.
Connect the gas pipe to the furnace using a backup wrench to
avoid damaging gas controls.
Step 6— Electrical Connections
115-V WIRING — Refer to the unit rating plate or Table 5 for
equipment electrical requirements. The control system requires an
earth ground for proper operation.
Do not connect aluminum wire between disconnect switch
and furnace. Use only copper wire.
Make all electrical connections in accordance with the National
Electrical Code ANSI/NFPA 70-1990 and local codes or ordi-
nances that might apply. For Canadian installations, all electrical
connections must be made in accordance with Canadian Electrical
Code CSA C22.1 or authorities having jurisdiction.
The cabinet MUST have an uninterrupted or unbroken ground
according to National Electrical Code ANSI/NFPA 70-1990
and Canadian Electrical Code CSA C22.1 or local codes to
minimize personal injury if an electrical fault should occur.
This may consist of electrical wire or conduit approved for
electrical ground when installed in accordance with existing
electrical codes. Do not use gas piping as an electrical ground.
The auxiliary junction box can be moved to the right-hand side of
the furnace when a right side power supply is desired. Remove the
2 screws holding the auxiliary junction box. Mount the junction
box on the right-hand side of the furnace (holes have been
predrilled in casing). The blower door interlock switch must also
be moved to the right-hand side of the furnace due to the length of
the wiring harness. When moved, tuck the wiring harness behind
the clip provided to keep extra wire lengths out of the way.
6
A89417