Bryant 479 D User Manual

Installation Instructions

479

Sizes 180 & 240

Series D

ALL WEATHER HEATING and COOLING UNIT

Figure 1—Model 479,

Cancels: 39479D6

brqant

39479D8 9/20/71

A70680

Important - Read before Installing

1. Check all local or other applicable codes for infor mation 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.

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 dimensionah drawing on page 2 for electrical, gas, duct and drain connections prior to set

ting the unit in place.

GENERAL

The Bryant Model 479 is an all weather heating and cooling unit designed for outdoor installation only. It can be installed at ground level or on a rooftop. The

479 is factory assembled, pre-wired and charged with

the primary refrigerant. Installation consists of the following:

Locating the Unit

Installing Vent Caps

II. III. Duct Connections IV.

Gas Connections

V. Electrical Connections VI. Chilled Water System

VII. Start-Up and Adjustments

VIII. Furnace Operation

IX, Cooling Operation

Maintenance

Read the entire Installation Instructions before star ting installation.

I. LOCATE AND MOUNT THE UNIT

The condenser air discharges upward; therefore, avoid locations where obstructions will deflect the hot condenser discharge air back into the condenser inlet air supply. In all cases, the condenser should be at least 2 feet from any wall or obstruction and outside of the plumb line from any overhang.

Use caution to prevent damage when moving the unit. Use an adequate rope or cable sling and keep the unit in an upright position at all times during rigging and

moving operations. CAUTION: Protect the top and sides so that the

rigging sling will not damage the unit.

22|^

.THERMOMETER WELL (4)

Í16

SIZE

180 240

A B 175 68 195 88

C 39-1/8 16-15/16 39-13/16

Approximate Shipping Weights 180-479. 240-479.

...

..........

...

..................

...................

...............

....

4900 lbs. 5700 lbs,

21-1/32

fil

lio

V M.RT GAS CONNECTION

28á

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-76-^

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ERT. DRAIN CONNECTION

18-^

Figure 2—Dimensional Drawing

HEATING RATINGS and CAPACITIES 180/240-479

Input 1st stage Output 1st Stage Input 1st and 2nd Stage Output 1st and 2nd Stage Approved Temp Rise

Model 180-479 Model 240-479

-B-

®16

66^

TABLE I

Btuh Btuh Btuh Btuh 337,000

°F 45 - 75 °F 20 - 50

225,000 168,000 450,000

TABLE II

COOLING RATINGS and CAPACITIES

MODEL 180-479 240-479

Capacity (Total Cooling) Btuh Air Flow External Static Pressure Entering Air Temperature Entering Water Temperature Gas Input (Total) Electrical Input (Total) Refrigerant Type

Amount per Chiller Lbs. Total Solution per Chiller Lbs. 55 79

CFM In. wg. 0.3 0.4 °F °F Btuh 450,000 600,000 KW 5.0

180,000 6,000 8,000

80/67 80/67 45 45

R717 18

240,000

6.0 R717

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Mounting Bases

The mounting base should comply with local codes

and be made of noncombustible material. The recom mended types of mounting bases for all installations are:

a. Precase concrete lintels. Use three lintels run the depth of the unit; one under the right end, one under the left end, and one at the center of the unit.

b. Steel beams. Use three I-beams run the depth of

the unit; one under each end and one at the center. c. Concrete Slab. A minimum thickness of four inches

is required.

Rooftop Installation

When installing the 479 on a roof or other com bustible material, use noncombustible supports and

allow a 6 inch clearance beneath the unit’s subbase for proper air circulation. Be sure the roof construc tion will support the weight of the equipment. Locate the unit above a load-bearing wall whenever possible.

Condensate Drain

The 479 is furnished with a 3/4 inch FPT drain con nection. If the installation requires draining the con densate away from the roof of the building, connect

tubing, pipe, hose or trough and pitch downward one inch for every ten feet of horizontal run.

Ground Level Installation

The 479 should be placed on a concrete slab at least 4 inches thick. Level the unit on the slab and be sure

there is adequate drainage away from its base.

Clearances

The minimum clearances are 6 inches from the duct side and 24 inches from all other sides.

II. INSTALLING VENT CAPS

The vent cap assemblies are packaged and shipped in the heating section coil compartment. Install the vent cap assemblies as follows. See Figure 3.

1. Remove the cover on each of the vents on the roof

of the unit.

2. Use the FAJ5606B screws supplied with the assem blies to fasten the base section of the vent cap assem bly.

3. Remove the three self-tapping screws in the top

cover, located approximately 7 inches behind each vent cap. Attach one of the air deflectors in this location for each vent cap, using the screws removed.

III. DUCT CONNECTIONS

Before attaching the ducting to the unit, remove the sheet metal panel that is used to protect the outlet and return openings. The ductwork may be screwed or

bolted to the unit flange with suitable gaskets to in

sure a weathertight seal. Be sure the sheet metal

overlaps the flange on the unit.

CAUTION: Take care not to puncture the evaporator

coil when drilling the duct flange. All duct work external of the structure must be

properly insulated and water-proofed.

All openings in the structure must be properly flashed

and vibration isolated in accordance with local codes and good building practices. Supply and return duct work should be provided with an approved vibration eliminator. The vibration eliminator must be located within the structure.

IV. GAS CONNECTIONS

The gas supply pipe for the Model 479 should be a

direct line from the gas meter or propane supply tank. The gas supply pipe should terminate at the unit with a tee.

The size of the gas pipe used depends upon the length of run and allowable pressure loss established by the utility. Never use pipe smaller than the gas connection

to the unit manifold. 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 up to risers.

2. A drip leg must be provided at any point in the line of pipe where condensate may collect. Such drip leg or

drip legs shall be installed in locations readily ac cessible to permit cleaning or emptying. The drip legs should not be located where they are subject to freezing. See Figure 4. Check local codes for size and capacity of drip legs.

3. Three manual shutoff valves should be installed; one valve between the gas supply pipe and heating

section, and one between each chiller and the gas sup ply pipe.

4. A ground joint union should be installed between the individual gas controls manifold and each manual shutoff valve.

DRIP LEG WITHIN'STRUCTURE

Figure 4—Drip Leg Location

5. The joint compound (pipe dope) used must be

resistant to the action of propane gas.

6. Support all piping with appropriate hangers. Use a minimum of one hanger every ten feet.

7. After all gas connections are made, check for leakage using soap and water solution, or leak-check unit in accordance with local utility regulations.

WARNING: NEVER USE A MATCH OR OPEN FLAME FOR LEAK TESTING.

Purging Gas Lines

After making all gas connections and checking for leaks, it is now necessary to purge the supply lines to eliminate trapped air.

WARNING: NEVER PURGE GAS LINES INTO THE COMBUSTION CHAMBERS OF THE FUR NACE OR CHILLERS.

1. With the furnace manual gas valve and pilot shutoff valve closed, disconnect the pilot supply tube at the pilot shutoff valve on the furnace.

2. Open the manual shutoff valve; then open the pilot shutoff valve and allow the supply line to purge until the odor of gas is detected. Immediately upon detec

ting a gas odor, turn off the gas and reconnect the pilot supply tube. Allow at least five minutes to elapse before lighting pilot.

3. Purge the gas line to each chiller in the same man

ner as described for the furnace.

V. ELECTRICAL CONNECTIONS

The Model 479 requires a 3 wire, 230 volt, 60 cycle, 3 phase power supply. Check the unit rating plate to make sure the power supply meets all the electrical

specifications. Electrical connections must be made in accordance with the National Electrical Code and the electrical code of the local area.

The field high voltage connections are made to the disconnect box located between the two chillers at the right end of the unit.

The field low voltage wiring consists of running seven wires from the thermostat subbase to the low voltage terminal block in the furnace. See Figure 5 for low

voltage field wiring.

Thermostat P/N 34427D55

and

Subhase P/N 34427D59

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