Bryant 378 User Manual
378
Installation Instructions
ALL WEATHER HEATING & COOL!!^iG
GENERAL
The Model 378 is approved by the American &
Association for:
1. Use with natural, mixed, and propane gases.
2. Outdoor installation
a. On a roof
b. At ground level
3. Indoor installation (when equipped with Bryant
draft hood assembly. Part No, 36154C8 and special
front door in place of door furnished.)
a. Attic
b. Basement, utility room, etc.
4. Use with 36W, 54W, 90W, and 108W water coils.
5. Use with 48R, 60R, 90R, and 120R direct expan
sion coils.
Series B
bpi|ont
39378 D9
5/10/65
INSPECTION
Be sure available gas supply is the same as shown
on American Gas Association rating plate.
Check electric supply - voltage, phase, and fre
quency - to be sure that it is the same as required
on the rating plate. Check to be sure that adequate
power is available to handle the increased electri
cal load when the unit is used for cooling.
Installation of the all-weather heating and cooling
unit consists of the following:
1. Locating the Unit
2. Gas Piping
3. Venting
4. Electric Connections
5. Start-up and Adjustment
6. Connection with Electric Air Conditioner (when
used)
7. Connection with Gas Air Conditioner (when
used)
LOCATING THE UNIT
When installing in conjunction with a cooling sys
tem refer to the applicable section of this instruc
tion for additional information.
Before locating the unit, refer to local codes.
OUTDOOR INSTALLATION
Mounting
The unit design permits use of four corner posts,
rails, or any other method of support sufficiently
strong to accommodate the weight; however, consult
local codes - particularly for roof installation.
Units must be level.
Clearances
1. Provide a minimum 1 inch clearance on bottom
for water drainage (rain, sleet, and snow).
m
3;
co
00
378 ALL WEATHER INDOOR/OUTDOOR UNIT
48R-378 60R-378
Heating input Btuh 150-100,000
Bonnet capacity
Btuh 112-75,000
DX Coil rating Btuh 48,000
Water Coil rating
Btuh
— —
Air flow CFM 1600
External static
Blower motor
In. water 0.20
H.P.
Volts
Phase
150-100,000
112-75,000 112-75,000
60,000
2000
0.20 0.15
1/2 3/4
230 230
1 1 1
Cycle 60
FLA
4
Suction line In. o.d. 1-1/8 7/8
Liquid line
Inlet water line
Outlet water line NPT
Condensate drain In. o.d. 7/8
Refrigerant R 500
Filters (disposable) In.
Approx, shipping wt. Lbs.
In. o.d.
NPT
1/2
3/8
- -
- 7/8
500
(2)25x20x1 (2)25x20x1
580
600
36W-378 54W-378
150-100,000
- -
36,000
1200 1800 3000 ' 4000
1/2
230
60
60
5 4
- - 1-1/8
1-1/4
JTTpri
7/8
- -
(2) 25x20x1
595 605 975 985
90R-378 120R-378 90W-378
150-100,000
300-200,000
300-200,000
112-75,000 225-150,000 225-150,000
54,000
0.20
90,000
—
0.25 0.30 0.25
110,000
■ — 90,000
3/4 1 Ir 1/2
230 230 230
1 1 1
60
60
5 7
1-3/8
1-1/4
1-1/4 ■■
7/8
5/8 5/8
-
—
7/8
-
7/8
22 500
(2) 25x20x1
(4) 25x20x1
(4)25x20x1 (4) 25x20x1
■ 300-200,000
225-150,000 225-150,000
: 3000
1 1- 1/2
: ; (230
1
60 60
9 7
- - - —
1-1/4
1-1/4
7/8
—
710
108W-378
300-200,000
__
108.000
3600
0.30
230
1
60
9
' -
1-1/4
1-1/4
7/8
(4)25x20x1
995
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”
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.
*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.
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 straightthrough 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.
- 3
EH 378
VENTING
INDOOR INSTALLATION
Consult local codes. Unless the local codes direct
otherwise, the unit may be vented to a permanent
chimney, or to a listed Type B or Type C gas vent.
The Model 378 furnace is approved for indoor instal
lation only when used with draft hood, Bryant Part
No. 36154C8.
To install indoor draft hood:
a. Remove upper front access panel to gain en
trance to flue collector.
8. If more than oiie appliance is vented into the
same chimney, the cross-sectional area of the chim
ney must be as large as the largest flue pipe being
connected, plus 50 per cent of the cross-sectional
areas of the additional flue pipes being connected.
9. If more than one appliance is manifolded into the
same flue connecting pipe, the cross-sectional area
of this manifold pipe must be as large as the sum of
the cross-sectional areas of the pipes connecting
into it.
10. Flue pipe must be at least 6 inches from any
combustible materials.
b. Insert draft hood inside furnace casing collar
and push it down over the flue collector collar to
form snug connection.
c. Fasten draft hood to flue collector collar with
sheet metal screws.
The following recommendations are made:
1. Select flue connection material that is satis
factory for the installation and that meets the
requirements of the local codes.
2. The flue connection pipe must be the same size
as the outlet collar on the furnace. No reduction in
this size is permissible in the pipe run.
3. Run pipe as directly as possible with a minimum
number of turns.
4. Maintain a minimum of 1/4 inch per linear foot
upward slope on all horizontal runs.
5. Rigidly support the flue pipe with hangers and
straps to insure that there will be no movement after
installation.
6. Extend the flue connection pipe through the
chimney wall, flush with the inner face of the chim
ney liner. Never connect into a chimney serving an
open fireplace unless the fireplace opening is
sealed off.
Do not use dampers or other adjustable restrictions
in flue.
Any part of the vent which is outdoors must be ade
quately insulated to assure proper chimney action
and prevent condensation.
OUTDOOR INSTALLATION
The Model 378 all-weather unit is shipped with out
door vent as standard equipment and must be instal
led in accordance with the following instructions
and without alterations.
Installing Outdoor Vent
1. Remove upper front access panel to gain en
trance to flue collector.
2. Insert cap and pipe assembly through furnace
casing.
Important: Be sure the outer wall of the double
walled pipe extends over the furnace casing con
nector collar to assure weather tight connection and
that the inner wall connects to the flue collector
collar.
3. Fasten the flue pipe assembly to the flue col
lector collar with sheet metal screws. Note: Addi
tional venting is not required on outdoor units.
7. The chimney or gas vent should extend high
enough above the roof or neighboring obstruction
so that wind from any direction will not create a
positive pressure in the vicinity of the outlet of the
chimney or gas vent. The installer is referred to
Part V of American Standard “Installation of Gas
Appliances and Gas Piping”, ASA Z21.30, 1959 for
detailed information on chimney and gas vent use.
In general, the chimney or gas vent should extend
3 feet higher than the point of emergence through
the roof, and at least 2 feet higher than any object
within a radius of 15 feet.
EH 378
ELECTRIC CONNECTIONS
1. All electrical connections are to be made in
accordance with National Electrical Codes and
local codes governing such wiring.
Field connections are to be made in accordance
with wiring label attached to unit. See Figures 1 and
2.
2. Weather tight connections must be made at elec
trical entrance to the unit on all outdoor installa
tions.
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