Bryant 551B manual 551A/558F/559F155-300, Guide Specifications - Sizes, PART 1 - GENERAL

GUIDE SPECIFICATIONS — SIZES 155-300

PACKAGED ROOFTOP ELECTRIC COOLING UNIT WITH ELECTRIC OR GLYCOL HEAT — CONSTANT VOLUME APPLICATION

HVAC GUIDE SPECIFICATIONS

SIZE RANGE: 13 to 25 TONS, NOMINAL COOLING, 14 to 80 kW (ELECTRIC HEAT)

123,000 to 405,000 BTUH (GLYCOL HEATING) BRYANT MODEL NUMBERS: 551A, 558F, 559F

PART 1 — GENERAL

1.01SYSTEM DESCRIPTION

Unit is an outdoor rooftop mounted, electrically controlled heating and cooling unit utilizing scroll hermetic compres- sors for cooling duty. Supply air shall be discharged down- ward or horizontally (with horizontal supply/return curb adapter assembly), as shown on contract drawings. Standard unit shall include a manual outdoor-air inlet.

1.02QUALITY ASSURANCE

A.Unit shall be rated in accordance with ARI Standards 270 and 360 and all units shall be designed in accordance with UL Standard 1995.

B.Unit shall be designed to conform to ASHRAE 15.

C.Unit shall be ETL and ETL, Canada tested and certified in accordance with ANSI Z21.47 Standards as a total package.

D.Roof curb shall be designed to conform to NRCA Standards.

E.Insulation and adhesive shall meet NFPA 90A require- ments for flame spread and smoke generation.

F.Unit casing shall be capable of withstanding 500-hour salt spray exposure per ASTM B117 (scribed specimen).

G.Unit shall be manufactured in a facility registered to ISO 9002/BS5750, Part 2.

1.03DELIVERY, STORAGE, AND HANDLING

Unit shall be stored and handled per manufacturer’s recommendations.

PART 2 — PRODUCTS

2.01EQUIPMENT (STANDARD)

A.General:

The unit shall be a factory assembled, single-piece heat- ing and cooling unit. Contained within the unit enclosure shall be all factory wiring, piping, controls, refrigerant charge (R-22), and special features required prior to field start-up.

B.Unit Cabinet:

1.Constructed of galvanized steel (G90 — 1.8 oz. of zinc per square foot [550 grams per square meter] of sheet metal), bonderized and primer-coated on both sides and coated with a baked polyester thermoset- ting powdercoating finish on the outer surface.

2.Indoor blower compartment interior surfaces shall be

insulated with a minimum 1/2-in. thick, 1 lb density fiberglass insulation.

3.Cabinet panels shall be easily removable for servic- ing. Cabinet panels are minimum 20 gage. Panels shall have 1/2-in. thick, 1.5-lb. density insulation.

4.Filters shall be accessible through an access panel.

5.Holes shall be provided in the base rails (minimum 12 gage) for rigging shackles to facilitate overhead rigging.

6.Unit shall contain a sloped drain pan, to prevent standing water from accumulating. Pan shall be fabri- cated of hot dipped zinc coated minimum spangle steel. Zinc coating shall be G90 designation accord- ing to ASTM Standard A653. Unit shall contain a factory-installed nonferrous main condensate drain connection.

C.Fans:

1.Indoor blower (evaporator fan):

a.Fan shall be belt driven. Belt drive shall include an adjustable pulley. The standard fan drive shall have a factory-installed low-medium static pres- sure fan drive. The alternate fan drive option shall have a factory-installed high static pressure fan drive.

b.Fan wheel shall be made from steel with a corro- sion resistant finish. It shall be a dynamically bal- anced, double-inlet type with forward-curved blades.

2.Condenser fans shall be of the direct-driven propeller type, with corrosion-resistant blades riveted to corro- sion-resistant steel supports. They shall be dynami- cally balanced and discharge air upwards.

D.Compressor(s):

1.Fully hermetic, scroll type, internally protected.

2.Factory spring-shock mounted and internally spring mounted for vibration isolation.

3.On electrically and mechanically independent refrig- erant circuits.

4.All compressors shall have 70 W crankcase heaters.

E.Coils:

1.Standard evaporator and condenser coils shall have aluminum plate fins mechanically bonded to seam- less internally grooved copper tubes with all joints brazed.

2.Coils shall be leak tested at 150 psig (1034 kPa) and pressure tested at 450 psig (3103 kPa).

3.Optional precoated aluminum-fin coils shall have a durable epoxy-phenolic coating to provide protection in mildly corrosive coastal environments. Coating shall be applied to the aluminum fin stock prior to the fin stamping process to create an inert barrier between the aluminum fin and copper tube. Epoxy- phenolic barrier shall minimize galvanic action between dissimilar metals.

4.Copper-fin coils shall be constructed of copper fins mechanically bonded to copper tubes and copper tube sheets. Galvanized steel tube sheets shall not be acceptable. A polymer strip shall prevent coil assembly from contacting the sheet metal coil pan to minimize potential for galvanic corrosion between coil and pan. All copper construction shall provide pro- tection in moderate coastal environments.

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