Guide Specifications - York PCG4A24 Technical Manual

GUIDE SPECIFICATIONS

GENERAL
Units shall be manufactured by Unitary Products in an ISO
9001 certified facility. Package units give you the flexibility and
choices you need in today's market. These packaged cooling/
heating air conditioners are designed for outdoor installation.
Only utility and duct connections are required at the point of
installation. The single-stage gas fired heaters have stainless
steel tubular heat exchangers and spark to burner ignition.
They are available in natural gas with field conversion to
propane.
DESCRIPTION
Units shall be factory-assembled, single packaged, Electric
Cooling/Gas Heating units, designed for outdoor installation.
For SEER ratings, refer to technical literature. They shall have
built in, equal size, field convertible duct connections for supply/
return or horizontal 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 models shall be rated in accordance with
DOE and AHRI test procedures for both heating and cooling
operation. Units shall be CSA listed and classified to ANSI
Z21.47/CAN/ CSA 2.3 standards and UL 1995/CAN/CSA No.
236-M90 standards.
UNIT CABINET
Unit cabinet shall be constructed of G-90 galvanized, powder-
painted steel, certified at 1000 hours salt spray test per ASTM-
B117 standards. The unit top shall be a single piece 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 foil-
faced or foam insulation, fastened to prevent insulation from
entering the air stream. Cabinet panels shall be separate, easily
removable for servicing and maintenance. Unit shall be built on
a formed, design base pan, with embossments at critical points
to add strength and rigidity and to 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 easily
removable, when required to lower unit height. Filters shall be
field installed, 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"
NPT female 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 a slide-out design for easy
removal and cleaning. Indoor blower motors shall be equipped
with a standard high efficiency brushless DC motor (constant
torque) also known as a standard ECM motor.
Johnson Controls Unitary Products
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 pro-
tected with internal high-pressure relief and over tempera-
ture 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 mini-
mize vibration and noise, and be externally isolated on a
dedicated, independent mounting.
Coils:
a. Evaporator coils shall have aluminum plate fins mechani-
cally bonded to seamless internally enhanced tin-coated
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 mechani-
cally bonded to seamless internally enhanced copper
tubes with all joints brazed.
d. Condenser coil shall be draw through design.
Refrigerant Circuit and Refrigerant Safety Components shall
include:
a. Thermal expansion devices (TXV's) shall be factory
mounted and provided.
b. Filter/strainer to eliminate any foreign matter.
GAS HEATING SECTION (If Equipped)
Heat exchanger and exhaust system shall be constructed of
corrosion-resistant materials and shall be designed with
induced draft combustion with post purge logic and redundant
main gas valve. The heat exchanger shall be of the tubular
type, constructed of stainless steel for corrosion resistance and
allowing minimum mixed air entering temperature of 40 ºF.
Burners shall be of the in-shot type, constructed of
aluminumized steel. All gas piping shall enter the unit cabinet at
a single location through either the side or bottom, without any
field modifications. An integrated control board shall provide
timed control of indoor fan functioning and burner ignition.
Heating section shall be provided with the following minimum
protection:
a. Primary high-temperature limit switch.
b. Induced draft pressure switch.
c. Flame roll out switch(s) (manual reset).
d. Flame proving controls.
All gas heat models will meet the current California requirement
for emissions of less than 40 nanograms per Joule (California
requirement on single phase models only).
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