Bryant Model 378 - Manual (Page 3)

Outdoor Installation - Clearances (cont’d)
2. Provide adequate clearance for outlet and return
duct connections.
3. Clearance from combustibles:
From casing, all sides and top 6"
* From base ............................... 0”
*This permits use of combustible material as sup­
port.
Caution: When using rails, etc. as support, do not
enclose unit so as to interfere with drainage.
4. Service clearance:
Front - 24"
Side - Provide adequate side clearance for fil­
ter removal. Clearance on left side for blower
service; side clearance for coil service.
Provide adequate clearance when air conditioner is
located adjacent to unit.
INDOOR INSTALLATION
Mounting
Unit may be set flush with floor or mounted on sup­
ports. There is no need to provide clearance under
the base. Shim as required to make unit level.
Clearances
1. From combustible materials:
a. 0 " clearance on bottom.
b. 6" clearance from casing surface; line con­
tact allowed.
c. 6" vent and draft hood.
2. Service access: Same as for outdoor installa­
tion.
COMBUSTION AND VENTILATION AIR
When the furnace is installed in a confined space,
but in a building otherwise having adequate infiltra­
tion from the outside, air for combustion and venti­
lation may be taken from the building. Two openings
should be provided, each having a free area of one
square inch for each 1000 Btu per hour- one located
above the draft diverter relief opening and the other
near the floor.
When the furnace is installed in a building of un­
usually tight construction, air for combustion and
ventilation should be obtained from outdoors or from
spaces freely communicating with the outdoors. Two
openings should be provided, each having a free
area of one square inch for each 2000 Btu per hour -
one located above the draft diverter relief opening
and the other near the floor.
For further information on this subject, refer to
ASA Z21.30-1959, or later editions of this standard,
“Installation of Gas Appliances and Gas Piping.”
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 pressure loss as low as practi­
cal.
Never use pipe smaller than the gas connection to
the furnace. Observe local codes for all gas pipe
installation.
The following are pertinent recommendations:
1. Avoid low spots in long runs of pipe, it is best
to grade all pipe 1/4 inch in 15 feet to prevent
traps. All horizontal runs should grade 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
and condensate.
The 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 the tee. The capped nipple
should extend below the level of the gas controls
a minimum of 6 inches.
3. A manual shut-off valve should be installed in
the gas line within sight of and convenient to the
furnace. This shut-off valve is furnished.
4. Support all piping with appropriate hangers, etc.
Properly support gas piping at furnace to prevent
damage to weather tight seal.
5. After all connections are made, check for leak­
age using soap and water solution, or in accordance
with local utility regulations. Never use a match or
other open flame.
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EH 378