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251933-YTG-B-0806
8
Unitary Products Group
Guide Specifications
General
Units shall be manufactured by York International Unitary
Products Group in an ISO 9001 certified facility.
York's ZJ/XP units are convertible single package units.
Although the units are primarily designed for curb mounting on
a roof, they can also be slab-mounted at ground level or set on
steel beams above a finished roof. Cooling only, cooling with
gas heat and cooling with electric heat models are available
with a wide variety of factory-mounted options and field-
installed accessories to make them suitable for almost every
application. All units are self-contained and assembled on full
perimeter base rails with holes in the four corners for overhead
rigging. Every unit is completely piped, wired, charged and
tested at the factory to simplify the field installation and to
provide years of dependable operation. All models (including
those with an economizer) are suitable for either bottom or
horizontal duct connections. Models with power exhaust are
suitable for bottom duct connections only. For bottom duct,
remove the sheet metal panels from the supply and return air
openings through the base of the unit. For horizontal duct,
remove the supply and return air panels on the rear of the unit.
All non-Scroll compressors include crankcase heaters and all
compressors have internal pressure relief. Every refrigerant
circuit includes a liquid line filter-drier, a discharge line high
pressure switch and a suction line with a freezestat and low
pressure/loss of charge switch.The unit control circuit includes
a 75 VA transformer, a 24-volt circuit breaker and a relay board
with a compressor lockout circuit, a terminal strip for thermostat
wiring, plus an additional set of pin connectors to simplify the
interface of additional field controls. All models are CSA listed.
All models include a 1-year limited warranty on the complete
unit. Compressors and electric heater elements carry a 5-year
warranty. Aluminized steel and Stainless steel tubular heat
exchangers carry a 10-year warranty.
Description
Units shall be factory-assembled, single packaged, Electric
Cooling/Gas Heat, Electric Cooling/Optional Electric Heat, Heat
Pump/Optional Electric Heat and are designed for outdoor
mounted installation.
The 3 ton, 4 ton and 5 ton units shall have minimum SEER rat-
ing of 13.0 with heat pumps having a 7.7 H.S.P.F. They shall
have built-in field convertible duct connections for down dis-
charge 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, charged
with R-410A refrigerant and factory tested prior to shipment. All
unit wiring shall be both numbered and color coded. All units the
cooling performance shall be rated in accordance with DOE
and ARI test procedures. Units shall be CSA listed, classified to
ANSI Z21.47, UL 1995/CSA No. 236 standards.
Unit Cabinet
Unit cabinet shall be constructed of G90 galvanized steel, with
exterior surfaces coated with a non-chalking, powdered paint
finish, certified at 1000 hours salt spray test per ASTMB117
standards. Indoor blower section shall be insulated with a
minimum 1/2” thick insulation, coated on the airside. Aluminum
foil faced insulation shall be used in the furnace compartment
and be fastened with ridged fasteners to prevent insulation from
entering the air stream. Cabinet panels shall be “large” size,
easily removable for servicing and maintenance. Full perimeter
base rails shall be provided to assure reliable transit of
equipment, overhead rigging and proper sealing on roof curb
applications. Disposable 1" filters shall be furnished and be
accessible through a removable access door, sealed airtight.
Units filter track shall be designed to accommodate either 1" or
2" filters. 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 air by-pass of the coils. Condensate pan
shall be internally sloped and conform to ASHRAE 62-89 self-
draining standards. Condensate connection shall be a minimum
of 3/4” I.D. female and be a ridged mount connection.
Indoor (Evaporator) Fan Assembly
The indoor fan shall be a factory installed belt drive assembly
that includes an adjustable pitch motor pulley. Job site selected
(B.H.P.) brake horsepower shall not exceed the motors
nameplate horsepower rating, plus the service factor. Units
shall be designed not to operate above service factor. Fan
wheel shall be double-inlet type with forward-curved blades,
dynamically balanced to operate smoothly throughout the entire
range of operation. Airflow design shall be constant air volume.
Bearings shall be sealed and permanently lubricated for longer
life and no maintenance.
Outdoor (Condenser) Fan Assembly
The outdoor fan shall be of the direct-driven propeller type,
discharge air vertically, have aluminum blades riveted to a
corrosion resistant steel spider bracket and shall be
dynamically balanced for smooth operation. The outdoor fan
motor shall be totally enclosed with permanently lubricated
bearings, internally protected against overload conditions and
staged independently.
Refrigerant Components
Compressor:
a. Shall be internally protected with internal high-pressure
relief and over temperature protection.
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
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