265485-XTG-B-1208
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Johnson Controls Unitary Products
GUIDE SPECIFICATIONS
PREDATOR
®
MagnaDRY™
DR 090
GENERAL
Units shall be manufactured by Unitary Products in an ISO
9001 certified facility. YORK® Predator
®
MagnaDRY™ units
are convertible single packages with a common footprint cab-
inet and common roof curb. All units have two compressors
with independent refrigeration circuits to provide 2 stages of
cooling. The units were designed for light commercial appli-
cations and can be easily installed on a roof curb, slab, or
frame. All Predator
®
MagnaDRY™ units are self-contained
and assembled on rigid full perimeter base rails allowing for
3-way forklift access and overhead rigging. Every unit is com-
pletely charged, wired, piped, and tested at the factory to pro-
vide 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
®
Mag-
naDRY™ 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. Units shall have
a minimum EER of 10.5 (3.08 CoP). 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-22
refrigerant and factory tested prior to shipment. All unit wiring
shall be both numbered and color coded. The cooling perfor-
mance shall be rated in accordance with DOE and ARI 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 1000 hours salt spray test per ASTM-B117
standards. Indoor blower sections shall be insulated with up
to 1/2” (1.27 cm) thick insulation coated on the airside. Alumi-
num foil faced insulation shall be used in the unit’s compart-
ments 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 equip-
ment, overhead rigging, fork truck access and proper sealing
on roof curb applications. Disposable 2” filters shall be fur-
nished and be accessible through hinged access door. Fan
performance measuring ports shall be provided on the out-
side of the cabinet to allow accurate air measurements of
evaporator fan performance without removing panels or cre-
ating 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. Con-
densate 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
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.
