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262292-YTG-B-0107
Unitary Products Group 53
GUIDE SPECIFICATIONS
GENERAL
Units shall be manufactured by York International Unitary
Products Group in an ISO 9001 certified facility.
York's Sunline Magnum™ units are convertible single package
units. All models have dual independent refrigerant circuits for
efficient part load operation and maximum comfort control.
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,
replace the supply and return air panels on the rear of the unit
with a side duct flange accessory. All supply air blowers are
equipped with a belt drive that can be adjusted to meet the
exact requirements of the job.
Each unit shall have 4 condenser fan motors. A high speed
drive accessory is available for applications with a higher CFM
and/or static pressure requirement. All compressors include
crankcase heat and internal pressure relief. Every refrigerant
circuit includes an expansion valve, 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 two compressor lockout circuits,
a terminal strip for thermostat wiring, plus an additional set of
pin connectors to simplify the interface of additional field
controls. All units have long lasting powder paint cabinets with
1000 hour salt spray test approval under ASTM-B117
procedures. All 208/230 and 460-volt models are ETL
approved. All 208/230 and 575-volt models are CGA approved.
All models include a 1-year limited warranty on the complete
unit. Compressors and electric heater elements carry an
additional 4-year warranty. Aluminized steel tubular heat
exchangers carry an additional 9-year warranty.
DESCRIPTION
Units shall be factory-assembled, single packaged, WR***N
Electric Cooling/Gas Heat, WR***C/E Electric Cooling/Optional
Electric Heat, designed for outdoor mounted installation. The 15
and 20 ton units shall have minimum EER ratings of 9.7. The 25
ton unit shall have a minimum EER rating of 9.5.
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,
charged with R-22 refrigerant and factory tested prior to
shipment. All unit wiring shall be both numbered and color
coded. All units shall be manufactured in a facility certified to
ISO 9001 standards and the cooling performance shall be rated
in accordance with DOE and ARI test procedures. Units shall
be ETL & CGA listed, classified to ANSIZ21.47 standards, UL
1995/CAN/CSA No. 236-M90 conditions.
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 hour salt spray test per ASTM-B117
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 2" 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 1" I.D. female and be a ridged mount connection. Unit shall
incorporate a fixed outdoor air damper with an outdoor air
intake opening covered with a bird screen and a rain hood
painted to match the exterior of the unit.
INDOOR (EVAPORATOR) FAN ASSEMBLY
Fan shall be a belt drive assembly and include 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.
A variable air volume (VAV) option using a variable frequency
drive (VFD) is available for applications requiring a constant
supply duct static pressure. Units equipped for VAV shall be
controlled by a duct pressure transducer with a 0 - 5” WC pres-
sure range. The pressure transducer shall provide a 0 - 5 VDC
output signal to a VAV control board which, in turn shall provide
a 2 - 10 VDC speed reference signal to the VFD. Units
equipped with VFD’s shall have factory-installed manual bypass
as an option.