5167821-YTG-J-0518
Johnson Controls Ducted Systems 11
Guide Specifications
GENERAL
YORK® Predator
®
units are convertible single packages with a
common footprint cabinet and common roof curb for all 3
through 5 ton models. The units were designed for light
commercial applications and can be easily installed on a roof
curb, slab, or frame. All Predator
®
units are self-contained and
assembled on rigid full perimeter base rails allowing for 3-way
forklift access and overhead rigging. Every unit is completely
charged with R-410A, wired, piped, and tested at the factory to
provide a quick and easy field installation. All units are
convertible between side and down airflow. Independent
economizer designs are used on side and down discharge
applications, as well as all tonnage sizes. Predator
®
units are
available in the following configurations: cooling only, cooling
with electric heat and cooling with gas heat. Electric heaters
are available as factory-installed options or field-installed
accessories.
DESCRIPTION
Units shall be factory assembled, single package, (Elec/Elec, Gas/
Elec), designed for outdoor installation. They shall have built in
field convertible duct connections for down discharge supply/return
or horizontal discharge supply/return and be available with factory
installed options or field installed accessories. The units shall be
factory wired, piped and charged with R-410A refrigerant and
factory tested prior to shipment. All unit wiring shall be both
numbered and color coded. The cooling performance shall be
rated in accordance with DOE and AHRI test procedures. Units
shall be CSA certified to ANSI Z21.47 and UL 1995/CAN/CSA No.
236-M90 standards.
UNIT CABINET
Unit cabinet shall be constructed of galvanized steel with
exterior surfaces coated with a non-chalking, powder paint
finish, certified at a 750-hour salt spray test per ASTM-B117
standards. Indoor blower sections shall be insulated with up to
1” thick insulation coated on the airside. Either aluminum foil
faced or elastometric rubber insulation shall be used in the
unit’s compartments and be fastened to prevent insulation from
entering the air stream. Cabinet doors shall be hinged with
toolless access for easy servicing and maintenance. Full
perimeter base rails shall be provided to assure reliable transit
of equipment, overhead rigging, fork truck access and proper
sealing on roof curb applications. Disposable 2” filters shall be
furnished as standard and be accessible through hinged access
door. Fan performance measuring ports shall be provided on
the outside of the cabinet to allow accurate air measurements
of evaporator fan performance without removing panels or
creating bypass of the coils. Condensate pan shall be slide out
design, constructed of a non corrosive material, internally
sloped and conforming to ASHRAE 62-B9 standards.
Condensate connection shall be a minimum of ¾” I.D. female
and be rigid mount connection.
INDOOR (EVAPORATOR) FAN ASSEMBLY
Fan shall be a belt drive assembly and include an adjustable
pitch motor pulley. Job site selected brake horsepower shall not
exceed the motors nameplate horsepower rating plus the ser-
vice factor. Units shall be designed to operate within the service
factor. Fan wheel shall be double inlet type with forward curve
blades, dynamically balanced to operate smoothly throughout
the entire range of operation. Design shall meet ASHRAE 90.1
single-zone variable supply air volume standard. Bearings shall
be sealed and permanently lubricated for longer life and no
maintenance. Entire blower assembly and motor shall be slide
out design.
OUTDOOR (CONDENSER) FAN ASSEMBLY
The outdoor fans shall be of the direct drive type, discharge air
vertically, have aluminum blades riveted to corrosion resistant
steel spider brackets and shall be dynamically balanced for
smooth operation. The outdoor fan motors shall have permanently
lubricated bearings internally protected against overload
conditions and staged independently. A cleaning window shall be
provided on two sides of the units for coil cleaning.
REFRIGERANT COMPONENTS
Compressors:
a. Shall be fully 2-stage, hermetic type, direct drive,
internally protected with internal high-pressure relief and
over temperature protection. The hermetic motor shall be
suction gas cooled and have a voltage range of + or –
10% of the unit nameplate voltage.
b. Shall have internal spring isolation and sound muffling to
minimize vibration and noise, and be externally isolated
on a dedicated, independent mounting.
Coils:
a. Evaporator coils shall have aluminum plate fins
mechanically bonded to seamless internally enhanced
copper tubes with all joints brazed. Special Phenolic
coating shall be available as a factory option.
b. Evaporator coils shall be of the direct expansion, draw-
thru design.
c. Condenser coils shall have Micro-Channel aluminum
tube, aluminum fins.
d. Condenser coils shall be of the draw-thru design.
Refrigerant Circuit and Refrigerant Safety Components shall
include:
a. Independent fixed-orifice or thermally operated
expansion devices.
b. Solid core filter drier/strainer to eliminate any moisture or
foreign matter.
c. Accessible service gage connections on both suction
and discharge lines to charge, evacuate, and measure
refrigerant pressure during any necessary servicing or
troubleshooting, without losing charge.
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