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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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

=16

23|

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|0.D.

CONDENSATE DRAIN

REAR

A69163

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

*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

12.5

9.8

230-60-1

4.9

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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-2

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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