A caution, A warning – Carrier WEATHERMAKER 8000 58WAV User Manual
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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.
A89014
Fig. 6—Leveling Leg Installation
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.
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 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.)
Fig. 7—Typical Gas Pipe Arrangement
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 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.
A
WARNING
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.
A
CAUTION
Use a backup wrench when connecting the gas pipe to the
furnace to avoid damaging gas controls.
Table 4—Maximum Capacity of Pipe*
NOMINAL
IRON PIPE
SIZE (IN.)
INTERNAL
DIAMETER
(IN.)
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 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).
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