Bryant 394U - Gas Piping Installation and Capacity

GAS PIPING
The gas supply line should be a separate line direct
from the meter to the furnace. Check local utility for.
recommendations concerning existing lines. Choose
a supply pipe size large enough to. keep the pres-
sure loss as low as practicable. The supply pipe
should never be smaller than the inlet to the gas
valve. For pipe capacities at 0.3 inches w.c. pres-
sure drop, see Iron Pipe Capacity table below.
. Observe local codes for all gas pipe installation.
The following are pertinent recommendations: |
1. Avoid low spots in long runs of pipe. These low
spots may trap water in the supply line. It is best
to slope all pipe 1/4 inch in 15 feet to prevent
.traps. All horizontal runs should slope to risers.
Risers should be used to connect to the furnace and
to the meter. |
2. Install a drip leg in the riser leading to the
furnace. This drip leg will serve as a trap for dirt
. or.condensate.
This drip leg can be installed by connecting a TEE
to the riser leading to the furnace, so that the
straight-through ‘section of the TEE is vertical.
^ Then connect a capped nipple to this TEE. The
capped nipple should extend below the level of the
gas controls, with the cap resting on the floor.
3. Install the main manual gas shut-off valve in the |
supply line five feet above the floor. Install the
valve (supplied) so that the pilot manual cock is on
the inlet side of the valve.
. MAIN MANUAL SHUT-OFF
5 FEET ABOVE FLOOR.
Figure 5 — Gas Piping
Figure 6
Lenath
of
Pi
wipe
ES
in
Cubic
Feet
Per
Hour
Multiplier
to
Use
Eb
x
ud
for
ee
ΩΝ
Shown
for
Different
Specific
Gravit
uii
a wei tr
1. All values shown are based on a pressure drop of 0. a w.c. and using gas with a specific gravity value
of 0.60 Consult local utility for local variations.
2. To convert to capacities for gas of different specific gravity, multiply the capacity values by the multi-
pliers shown at the extreme right on table.
394U