Bryant 702B - Manual (Page 26)

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GUIDE SPECIFICATIONS
PACKAGED ELECTRIC COOLING UNITS
CONSTANT VOLUME APPLICATION
HVAC Guide Specifications
Size Range: 2 to 5 Tons, Nominal Cooling
Bryant Model Number: 702B
Part 1—General
SYSTEM DESCRIPTION
Outdoor rooftop or ground mounted, electric cooling unit
utilizing a hermetic compressor for cooling duty and op-
tional electric heating. Unit shall discharge supply air ver-
tically or horizontally as shown on contract drawings.
Condenser fan/coil section shall have a draw-thru design
with vertical discharge for minimum sound levels.
QUALITY ASSURANCE
A. Unit shall be rated in accordance with ARI Standards 210/
240-94 and 270-95.
B. Unit shall be designed in accordance with UL Standard
1995.
C. Unit shall be manufactured in a facility registered to ISO
9001 manufacturing quality standard.
D. Unit shall be UL listed and c-UL certified as a total package
for safety requirements.
E. Roof curb shall be designed to conform to NRCA Stan-
dards.
F. Insulation and adhesives shall meet NFPA 90A require-
ments for flame spread and smoke generation.
G. Cabinet insulation shall meet ASHRAE Standard 62P.
DELIVERY, STORAGE AND HANDLING
Unit shall be stored and handled per manufacturer’s rec-
ommendations.
Part 2 — Products
EQUIPMENT
A. General:
Factory-assembled, single-piece, cooling unit. Contained
within the enclosure shall be all factory wiring, piping, con-
trols, refrigerant charge (R-410A), and special features re-
quired prior to field start-up.
B. Unit Cabinet:
1. Unit cabinet shall be constructed of phosphated, zinc-
coated, pre-painted steel capable of withstanding 500
hours of salt spray.
2. Normal service shall be through a single removable
cabinet panel.
3. The unit shall be constructed on a rust proof basepan
that has an externally trapped, integrated sloped drain
pan.
4. Evaporator fan compartment top surface shall be insu-
lated with a minimum 1/2-in. thick, flexible fiberglass in-
sulation, coated on the air side and retained by
adhesive and mechanical means. The evaporator wall
sections will be insulated with a minimum semi-rigid
foil-faced board capable of being wiped clean. Alumi-
num foil-faced fiberglass insulation shall be used in the
entire indoor air cavity section.
5. Unit shall have a field-supplied condensate trap.
C. Fans:
1. The evaporator fan shall be 3-speed, direct-drive, as
shown on equipment drawings, or factory installed op-
tional variable speed motor and control.
2. Fan wheel shall be made from steel, and shall be double-
inlet type with forward curved blades with corrosion resis-
tant finish. Fan wheel shall be dynamically balanced.
3. Condenser fan shall be direct drive propeller type with
aluminum blades riveted to corrosion resistant steel
spiders, be dynamically balanced, and discharge air
vertically.
D. Compressor:
1. Fully hermetic compressors with factory-installed vibra-
tion isolation.
2. Scroll compressors shall be standard on all units.
E. Coils:
Evaporator and condenser coils shall have aluminum
plate fins mechanically bonded to seamless copper tubes
with all joints brazed. (Copper/copper and vinyl-coated
construction available as option.) Tube sheet openings
shall be belled to prevent tube wear.
F. Refrigerant Metering Device:
Refrigerant metering device shall be of the single body
fixed orifice feed type.
G. Filters:
Filter section shall consist of field-installed, throwaway, 1-
in. thick fiberglass filters of commercially available sizes.
H. Controls and Safeties:
1. Unit controls shall be complete with a self-contained
low voltage control circuit.
2. Units shall incorporate an internal compressor protec-
tor that provides reset capability.
3. Unit shall provide High and Low/Loss-of-Charge Pres-
sure Safety Protection.
I. Operating Characteristics:
1. Unit shall be capable of starting and running at 125°F
ambient outdoor temperature, exceeding maximum
load criteria of ARI Standard 210.
2. Compressor with standard controls shall be capable of
operation down to 40° F ambient outdoor temperature.
(55°F with ICM FIOP)
3. Unit shall be provided with 60-second fan time delay af-
ter the thermostat is satisfied (with standard indoor
blower motor).
4. On ICM FIOP-Fan on/off delay profile is selected (for
cooling) on the Easy Select™ Board.
J. Electrical Requirements:
All unit power wiring shall enter the unit cabinet at a single
location.
K. Motors:
1. Compressor motors shall be of the refrigerant-cooled
type with line-break thermal and current overload pro-
tection.
2. All fan motors shall have permanently lubricated bear-
ings, and inherent, automatic reset, thermal overload
protection.
3. Condenser fan motor shall be totally enclosed.
L. Grille
1. Louvered Grille:
Louvered grille shall be standard on all units.
M. Special Features Available
1. ICM Indoor Blower FIOP:
Integral control motor shall be a factory installed option
for optimizing comfort levels in all operating modes and