York DM 078 用户手册

246645-YTG-C-0708

46

Johnson Controls Unitary Products

®

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.

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 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.

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. 

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.

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.