York PREDATOR DM 078 - Manual (Page 46)

246645-YTG-C-0708
46 Johnson Controls Unitary Products
GUIDE SPECIFICATIONS
PREDATOR ®
DM 078, 090, 102, 120 & 150
9.0 EER
GENERAL
Units shall be manufactured by York International Unitary
Products Group in an ISO 9001 certified facility. YORK
® Pred-
ator ® units are convertible single packages with a common
footprint cabinet and common roof curb for all 6-1/2 through
12-1/2 ton models. All units have two compressors with inde-
pendent refrigeration circuits to provide 2 stages of cooling.
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, 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 configura-
tions: cooling only, cooling with electric heat, and cooling with
gas heat. Electric heaters are available as factory-installed
options and field-installed accessories.
DESCRIPTION
Units shall be factory assembled, single package, (Elec/Elec,
Gas/Elec), designed for outdoor installation. Units shall have
a minimum EER of 9.0. They shall have built in field convert-
ible duct connections for down discharge supply/return or
horizontal discharge supply/return and be available with fac-
tory installed options or field installed accessories. The units
shall be factory wired, piped and charged with R-22 refriger-
ant 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 ARI test proce-
dures. 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 G90 galvanized steel with
exterior surfaces coated with a non-chalking, powder paint
finish, certified at 1000 hours salt spray test per ASTM-B117
standards. Indoor blower sections shall be insulated with up
to 1” thick insulation coated on the airside. Aluminum foil
faced 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 tool-less 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
and be accessible through hinged access door. Fan perfor-
mance 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, con-
structed of a non corrosive material, internally sloped and
conforming to ASHRAE 62-B9 standards. Condensate con-
nection 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
service factor. Units shall be designed to operate within the
service factor. Fan wheel shall be double inlet type with for-
ward curve blades, dynamically balanced to operate
smoothly throughout the entire range of operation. Airflow
design shall be constant volume. Bearings shall be sealed
and permanently lubricated for longer life and no mainte-
nance. 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 bal-
anced 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 hermetic type, direct drive, internally pro-
tected with internal high-pressure relief and over temper-
ature 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 and condenser 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 and condenser coils shall be of the direct
expansion, draw-thru design.