Carrier 58PAV - Manual (Page 5)

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.
V. GAS PIPING
Gas piping must be installed in accordance with national
and local codes. Refer to the current edition of the National
Fuel Gas Code. Canada installations must be installed in
accordance with CAN/CGA.B149 Installation Codes, 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 Pipe
Size
Ins.
Internal
Diameter
Ins.
Length of Pipe, Ft
10 20 30 40 50
1/2 0.622 175 120 97 82 73
3/4 0.824 360 250 200 170 151
1 1.049 680 465 375 320 285
1-1/4 1.380 1400 950 770 660 580
1-1/2 1.610 2100 1460 1180 990 900
*Cubic ft of gas per hour, for gas pressures of 0.5 psig (14 ins. wc) or less,
and a pressure drop of 0.5 in. wc (based on a 0.60 specific gravity gas).
Ref; Table C-4 NFPA 54-1988.
A CAUTION
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-
ins. 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
Fig. 7—Typical Gas Pipe Arrangement
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.
A WARNING
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.
An accessible manual shut-off valve shall be installed
upstream of the furnace gas controls and within 6 ft of the
furnace. A 1/8-in. NPT plugged tapping, accessible for test
gauge 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.
A WARNING
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, per­
sonal injury, or death.
A CAUTION
Use a backup wrench when connecting the gas pipe to
the furnace to avoid damaging gas controls.
VI. ELECTRICAL CONNECTIONS
A. 115-Volt Wiring
Refer to the unit rating plate or Table 5 for equipment elec­
trical requirements. The control system requires an earth
ground for proper operation.
A CAUTION
Do not connect aluminum wire between disconnect
switch and furnace. Use only copper wire.