Unit Cabinet; Refrigerant Components - Coleman PCG4A36 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 outdoor 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 Blower 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 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. Indoor coils shall have aluminum plate fins mechanically
bonded to seamless internally enhanced tin-coated cop-
per tubes with all joints brazed.
b. Indoor coil shall be of the direct expansion, draw through
design.
c. Outdoor coils shall have aluminum plate fins mechanically
bonded to seamless internally enhanced copper tubes
with all joints brazed.
d. Outdoor 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
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 40ºF.
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 California requirement for
emissions of less than 40 nanograms per Joule.
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