Bryant 581C - Manual (Page 281)

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GUIDE SPECIFICATIONS — 579F/580F180-300 AND 581A155,180 SIZE UNITS
PACKAGED ROOFTOP ELECTRIC COOLING UNIT WITH
GAS HEAT — CONSTANT VOLUME APPLICATION
HVAC GUIDE SPECIFICATIONS
SIZE RANGE: 13 AND 15 TONS (581A), 15 TO 25 TONS
(579F, 580F), NOMINAL (COOLING)
230,000 TO 360,000 BTUH, NOMINAL (INPUT
HEATING) (GAS UNITS)
BRYANT MODEL NUMBERS: 580F, 579F, 581A
PART 1 — GENERAL
1.01 SYSTEM DESCRIPTION
Unit is an outdoor rooftop mounted, electrically controlled
heating and cooling unit utilizing scroll hermetic compres-
sors for cooling duty and gas combustion for heating duty.
Supply air shall be discharged downward or horizontally
(with horizontal supply/return curb adapter assembly), as
shown on contract drawings. Standard unit shall include a
manual outdoor-air inlet.
1.02 QUALITY 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.
NOTE: Size 300 units are beyond the scope of ARI certifi-
cation guidelines.
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 9001:2000.
1.03 DELIVERY, STORAGE, AND HANDLING
Unit shall be stored and handled per manufacturer’s
recommendations.
PART 2 — PRODUCTS
2.01 EQUIPMENT (STANDARD)
A. General:
Each 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 of sheet metal), bonderized and
primer-coated on both sides and coated with a baked
polyester thermosetting powdercoating finish on the
outer surface. The color of this pre-painted steel is
referred to as “American Sterling,” a gray color.
Bryant’s paint specification for this color is PH184.
Color: American Sterling, this gray color is to match
federal standard 595a, #26231.
Gloss (per ASTM 0523, 60 deg. F): 60.
Hardness of paint film: H-2H pencil hardness.
2. Indoor blower compartment interior surfaces shall be
insulated with a minimum 1 /
2
-in. thick, 1 lb density
fiberglass insulation. Fiberglass insulation shall be
bonded with a thermosetting resin (8 to 12% by
weight nominal, phenol formaldehyde typical), and
coated with an acrylic or other material that meets
the NFPA 90 flame retardance requirements and has
an ‘‘R’’ Value of 3.70. Aluminum foil-faced fiber-
glass insulation shall be used in the gas heat
compartment.
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 external
static pressure capable fan drive. The alternate
fan drive option shall have a factory-installed
external high static pressure capable fan drive.
b. Fan wheel shall be made from steel with a
corrosion-resistant finish. It shall be a dynamically
balanced, double-inlet type with forward-curved
blades.
2. Condenser fans shall be of the direct-driven propeller
type, with corrosion-resistant blades riveted to
corrosion-resistant steel supports. They shall be
dynamically balanced and discharge air upwards.
3. Induced-draft blower shall be of the direct-driven,
single inlet, forward-curved, centrifugal type. It shall
be made from steel with a corrosion-resistant finish
and shall be dynamically balanced.
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 and pressure
tested at 450 psig.
F. Heating Section:
1. Induced-draft combustion type with energy saving
direct-spark ignition system and redundant main gas
valve.
2. a. The heat exchanger shall be of the tubular-
section type constructed of a minimum of 20-gage
steel coated with a nominal 1.2 mil aluminum-
silicone alloy for corrosion resistance.
b. The optional stainless steel heat exchangers shall
be tubular-section design and shall be constructed
of a minimum 20 gage, 409 stainless steel.