Technical Guide

718432-YTG-D-0313
Johnson Controls Unitary Products 5
• Low Ambient Kit - Kit provides necessary hardware to
convert unit to operate in cooling cycle down to 0º F.
Standard unit operation 45º F.
• Transformer Kit - Kit provides necessary hardware to
provide single phase models from factory furnished 40 VA
transformer capability to 75 VA transformer capability.
(Required on installations with economizer or motorized
damper.)
Guide Specifications
General
Units shall be manufactured by Johnson Controls Unitary
Products in an ISO 9001 certified facility. YORK’s Affinity™
package units give you the flexibility and choices you need in
today’s market. These packaged air conditioners are designed
for outdoor installation. Only utility and duct connections are
required at the point of installation.
Description
Units shall be factory-assembled, single packaged, Electric
Cooling units, designed for outdoor mounted installation. For
SEER ratings, refer to technical literature. They shall have built
in, equal size, field convertible duct connections for down
discharge supply/return or horizontal discharge supply/return.
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 shall be
manufactured in a facility certified to ISO 9001 standards, and
the cooling performance shall be rated in accordance with DOE
and AHRI test procedures. Units shall be CSA listed and
classified to ANSI Z21.47/CAN/CSA 2.3 standards and UL
1995/CAN/CSA No. 236-M90 conditions.
Unit Cabinet
Unit cabinet shall be constructed of G-90, pre-paint textured steel,
certified at 500 hours salt spray test per ASTM-B117 standards.
The unit top shall be a single piece “Water Shed” design, with drip
edges and no-seam corners to provide optimum water integrity.
Unit shall have a rigidly mounted condenser coil guard to provide
protection from objects and personnel after installation. Indoor
blower section shall be insulated with up to 3/4” thick, aluminum,
foil faced insulation, fastened to prevent insulation from entering
the air stream. Cabinet panels shall be “large” size, easily
removable for servicing and maintenance, with built-in lift handles.
Unit shall be built on a formed, “Super-Structure” design base pan,
with embossments at critical points to add strength, rigidity and aid
in minimizing sound. Full perimeter base rails shall be provided to
assure reliable transit of equipment, overhead rigging, for truck
access and proper sealing on roof curb applications. Base rails
shall be removable, when required, to lower unit height. Filters
shall be furnished and be accessible through a removable access
door, sealed airtight. Units vertical discharge and return duct
configuration shall be designed to fit between standard 24” O.C.
beams without modification to building structure, duct work and
base unit. Condensate pan shall be internally sloped and conform
to ASHRAE 62-89 self-draining standards, with 3/4” NPTI copper,
ridged mount connection.
Indoor (Evaporator) Fan Assembly
Fan shall be direct drive design. 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. Fan assembly shall be “Slip Track” (slide-out)
design for easy removal and cleaning.
Outdoor (Condenser) Fan Assembly
The outdoor fan shall be of the direct-driven propeller type,
discharge air vertically, have aluminum blades riveted to
corrosion resistant steel spider bracket and shall be statically
balanced for smooth operation. The outdoor fan motor shall be
totally enclosed with permanently lubricated bearings and
internally protected against overload conditions.
Refrigerant Components
Compressors:
a. Shall be fully hermetic type, direct drive, internally
protected with internal high-pressure relief and over
temperature protection. The hermetic motor shall be
suction gas cooled and have a voltage range of +/- 10%
of the unit nameplate voltage.
b. Shall have internal isolation and sound muffling to
minimize vibration and noise, and be externally isolated
on a dedicated, independent mounting.
Coils:
a. Evaporator coils shall have aluminum plate fins
mechanically bonded to seamless internally enhanced
copper tubes with all joints brazed.
b. Evaporator coil shall be of the direct expansion, draw
through design.
c. Condenser coils shall have aluminum plate fins
mechanically bonded to seamless internally enhanced
copper tubes with all joints brazed or Mircro-Channel
aluminum tube, aluminum fins.
d. Condenser coil shall be draw through design.
Refrigerant Circuit and Refrigerant Safety Components shall
include:
a. Independent fixed orifice expansion devices.
b. Filter/strainer to eliminate any foreign matter.
Electric Heating Section
(Field Install Accessory)
An electric heating section, with nickel chromium elements,
shall be provided in a range of 5 thru 25 KW. The heating
section shall have a primary limit control(s) (automatic reset) to
prevent the heating element system from operating at an
excessive temperature. The Heating Section assembly shall
slide out of the unit for easy maintenance and service. Units
with Electric Heating Sections shall be wired for a single point
power supply with branch circuit fusing (where required).