Guide Specifications - York WJ 180 Technical Manual

262291-YTG-F-1009

GUIDE SPECIFICATIONS

GENERAL
Units shall be manufactured by Unitary Products in an ISO
9001 certified facility.
York's Sunline Magnum™ units are convertible single pack-
age units. All models have dual independent refrigerant cir-
cuits 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. A high
static drive option is available for applications with a higher
CFM and/or static pressure requirement.
Each unit shall have 4 condenser fan motors. All compres-
sors 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 compres-
sor 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 models are CSA 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, Electric
Cooling/Gas Heat WJ***N/S, Electric Cooling/Optional
Electric Heat, WJ***C/E, designed for outdoor mounted
installation. The 15 and 20 ton units shall have minimum EER
ratings of 11.1. The 25 ton unit shall have a minimum EER
rating of 10.5.
50
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 ship-
ment. 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 CSA listed, classified to ANSIZ21.47 standards, UL 1995/
CAN/CSA No. 236-M90 conditions.
UNIT CABINET
Unit cabinet shall be constructed of galvanized steel, with exte-
rior surfaces coated with a non-chalking, powdered paint fin-
ish, certified at 1000 hours salt spray test per ASTM-B117
standards. Indoor blower section shall be insulated with a min-
imum 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 equip-
ment, overhead rigging and proper sealing on roof curb appli-
cations. 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 measure-
ments 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 incor-
porate 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 for-
ward-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 sup-
ply duct static pressure. Units equipped for VAV shall be con-
trolled by a duct pressure transducer with a 0 - 5" WC pressure
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. The VAV control board
shall operate using factory-installed Supply Air, Return Air and
Outside Air Temperature Sensors. Units equipped with VFD's
shall have factory-installed manual bypass as an option.
Johnson Controls Unitary Products