Bryant 379A User Manual
Installation Instructions
379A
Models
48W- & 60W-379A
Series C
OUTDOOR HE ATI N G UNIT
Bryant Models 48W-379A and 60W-379A are outdoor
heating units designed for installation on a rooftop or
at ground level. Both models have a chilled water coil
factory installed. Model 48W-379A is equipped with a
48.000 Btuh coil while Model 60W-379A is equipped
with a 60,000 Btuh coil.
These units were designed for use in split systems with
matching Bryant gas-fired water chillers. Both models
have 150,000 Btuh heating input rating and a 112,500
Btuh heating output rating. Model 48W-379A has a
48.000 Btuh cooling rating when connected to a
Bryant Model 48-453 Gas-Fired Water Chiller. Model
60W-379A has 60,000 Btuh cooling rating when con
nected to a matching Bryant Model 60-452 Gas-Fired
Water Chiller.
Important—Read before Installing
1. Check all local or other applicable codes for in
formation concerning proximity to property lines,
height above roof, obstructions, etc.
2. Be sure the power supply available (voltage,
frequency, and phase) corresponds to that specified
on the unit rating plate.
3. Check the electrical service provided by the utility
for the building to be sure that the service capacity is
sufficient to handle the load imposed by this unit.
4. Refer to the regulations of the serving gas supplier
and the local building, heating, plumbing, or other
codes in effect in the area in which installation is to
be made.
5. Refer to the dimensional drawing on page 2 for
location of electrical, gas, and chilled water con
nections prior to setting the unit in place.
GENERAL
The design of this unit is certified by A.G.A. for use
with natural or propane gases with appropriate con
trols and orifices. This unit is designed for outdoor in
stallation only.
Installation of the unit consists of the following:
I. Locating the Unit
II. Gas Piping
III. Duct Connections
IV. Venting
V. Coil Connections
VI. Electrical Connections
VII. Start-up and Adjustments
fariiant
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’REMOVc- '
Figure 1—Model 48W-379A
In addition, the following section should be reviewed
by the equipment owner.
VIII. Maintenance
I. LOCATING THE UNIT
Extreme caution should be used when rigging and
moving the unit to prevent damage. The unit should
be kept upright during all rigging and moving
operations. To facilitate lifting and moving, place the
unit in an adequate sling made of rope or cable.
CAUTION: Be sure to protect the top and sides of the
unit from cable damage when rigging the unit to be
lifted.
Rooftop Installation
Level the unit on a base that is at least 6 inches above
the roof to provide drainage from beneath the unit.
Consult local codes for installation requirements. Be
sure that the roof will support the additional weight.
Ground Level Installation
If the unit is to be installed on the ground, it should
be placed on a level concrete slab with a minimum
thickness of 4 inches.
LINE VOLTAGE
LOW VOLTAGE
LEFT SIDE
1 FP.T. WATER
CONNECTIONS-
GAS CONNECTION
FRONT RIGHT SIDE
Figure 2—Dimensional Drawing
RETURN
AIR
43
1
4 IH*'....................M
rIN
2
=16
23|
'
■H i
|0.D.
CONDENSATE DRAIN
REAR
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TABLE 1 - HEATING
Model
Heating Input Btuh
Heating Output
Approved Temp Rise °F
Buth
CAPACITY
48W-379A & 60W-379A
150,000
112,500
45 - 75
TABLE II • «RATINGS AND PERFORMANCE
Model 48W-379A
Cooling Capacity
Airflow
External Static Pressure
Entering Air Temp
Entering Water Temp °F 45
Water Flow GPM
Water Pressure Drop Ft w.c. 18.1
Btuh 48,000
CFM
In. w.c. 0.43 0.52
°F 80DB/67WB 80DB/67WB
1600 2000
10
*Ratings given in Table II are for Model 48W-379A connected to a Model 48-453
Chiller and Model 60W-379A connected to a Model 60-452 Chiller.
60W-379A
60,000
TABLE III—ELECTRICAL CONNECTIONS
Model 48W-379A
Nameplate Voltage-Hertz-Phase
Unit Ampacity for Electrical Conductor Sizing
Min Branch Circuit Wire Size (75°C copper*) AWG
Max Branch Circuit Fuse Size Amps
Amps
208-60-1
6.2
14 14
15
45
12.5
9.8
230-60-1
4.9
15
60W-379A
208-60-1 230-60-1
8.6 6.9
14 14
15 15
*If other than 75°C copper is used, determine size from unit ampacity and the National Electric Code. Voltage drop of wire
selected must be less than 2% of unit rated voltage. Connections of aluminum wire must be in accordance with the National
Electric Code.
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NOTE: It is important that the unit be installed in a
level position.
Clearances
The rm'nimmn clearance is 6 inches from the duct
side, 24 inches on all other sides, and 0 inches on the
bottom. This permits the use of combustible materials
for supports.
CAUTION: When using rails, etc., as support, make
allowances for surface water drainage under the unit.
II. GAS PIPING
2. A separate gas supply line should be installed to
run directly from the meter to the furnace. Check your
local utility for recommendations concerning existing
lines. Choose a supply pipe sized large enough to keep
the pressure loss as low as practical.
CAUTION: Never use pipe smaller than the gas con
nection to the furnace. Observe local codes for all gas
pipe installations.
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 every 15 feet to prevent
traps. All horizontal runs should grade downward to
risers. Risers should be used to coimect 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 con
densate. Drip legs should be installed where con
densate will not freeze. (See Figure 3 for drip leg
location.)
3. A manual shutoff valve should be installed in the
gas supply pipe near the furnace where it can be
easily reached.
4. Place a ground joint union close to the unit be
tween the gas controls manifold and the manual
shutoff valve.
5. Support all piping with appropriate hangers, etc.
The maximum distance between hangers should be 10
feet.
6. Joint compound (pipe dope) must be resistant to
the action of propane gas.
WARNING: Never use a match or other open flame
to check for gas leakage.
7. After all connections are made, check for leakage
by using soap-and-water solution (or in accordance
with local utility regulations).
III. DUCT CONNECTIONS
Before ductwork can be attached to the unit, remove
and discard the cover panel that is located over the
outlet and return air openings. The ductwork may be
screwed or bolted to the unit flange with suitable
gaskets to insure weathertight seal. Be sure that the
sheet metal overlaps the flange on the unit.
All ductwork external of the structure must be
properly insulated and waterproofed. All openings in
the structure must be properly flashed and vibrationisolated in accordance with local codes and good
building practices. The supply and return ductwork
should be provided with an approved vibration
eliminator.
NOTE: The vibration eliminator must be located
within the structure.
NOTE: An external filter must be supplied and in
stalled where easily accessible for service. For the
minimum filter area, see the: unit rating plate.
IV. VENTING
A vent cap assembly and a sheet metal angle (air
deflector) are packaged and shipped with the unit.
The package is located in the blower compartment.
DRIP LEG
WITHIN STRUCTURE
Figure 3—Drip Leg Location
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