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GENERAL DESCRIPTION
Units shall be factory-assembled, single packaged, (DCG
Electric Cooling/Gas Heat, DCE Electric Cooling/Optional
Electric Heat), designed for outdoor mounted installation. Units
shall have minimum SEER ratings (036 thru 060) of 10.0 and
minimum EER ratings (072) of 9.0. 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. Enclosed in each unit
shall be a factory test log sheet consisting of the unit tested
pressures, temperatures and amps, as tested prior to
shipment.
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
UL listed and classified to ANSIZ21.47 standards and UL
1995/CAN/CSA No. 236-M90 conditions.
UNIT CABINET
1. Unit cabinet shall be constructed of G90 galvanized steel,
with exterior surfaces coated with a non-chalking, powered
paint finish, certified at 750 hours salt spray test per ASTM-
B117 standards.
2. Indoor blower section shall be insulated with up to 1” thick
insulation, coated on the air side. 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.
3. Cabinet panels shall be “large” size, easily removable for
servicing and maintenance.
4. Full perimeter base rails shall be provided to assure reliable
transit of equipment, overhead rigging, fork truck access
and proper sealing on roof curb applications.
5. Disposable 1” filters shall be furnished and be accessible
through a removable access door, sealed air tight. Units
filter track shall be designed to accommodate either 1” or
2” filters.
6. 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.
7. 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.
8. Condensate pan shall be internally sloped and conform to
ASHARE 62-89 self-draining standards. Condensate con-
nection shall be a minimum of 3/4” I.D. female and be a
ridged mount connection.
INDOOR (EVAPORATOR) FAN ASSEMBLY
1. Fan shall be direct drive, multi-speed, or a factory installed belt
drive, adjustable-pitch motor pulley option. Job site selected
(B.H.P.) brake horse power shall not exceed the motors name-
plate horse power rating, plus the service factor. Units shall be
designed not to operate above service factor.
2. Fan wheel shall be double-inlet type with forward-curved
blades, dynamically balanced to operate smoothly through-
out the entire range of operation. Airflow design shall be
constant air volume.
3. Bearings shall be sealed and permanently lubricated for
longer life and no maintenance.
OUTDOOR (CONDENSER) FAN ASSEMBLY
1. 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 dy-
namically balanced for smooth operation.
2. The outdoor fan motor shall be totally enclosed with perma-
nently lubricated bearings and internally protected against
overload conditions.
REFRIGERANT COMPONENTS
1. Compressors:
A. Shall be fully hermetic type, advanced scroll design, with
patented check valve to eliminate backspin noise at shut-
down, internally protected with internal high-pressure re-
lief and over temperature protection. The hermetic motor
shall be suction gas cooled and have a voltage range of +
or - 10% of the unit nameplate voltage.
B. Shall have sound muffling to minimize vibration and
noise, and be externally isolated on a dedicated, inde-
pendent mounting.
2. Coils:
A. Evaporator and condenser coils shall have aluminum
plate fins mechanically bonded to seamless internally-
enhanced copper tubes with all joints brazed. Special
Phenolic coating shall be available as a factory option.
B. Evaporator and Condenser coils shall be of the direct
expansion, draw-thru design.
3. Refrigerant Circuit and Refrigerant Safety Components
shall include:
A. Independent fixed-orifice expansion devices.
B. Filter drier/strainer to eliminate any moisture or foreign matter.
C. Accessible service gage connections on both suction
and discharge lines to charge, evacuate, and measure
refrigerant pressure during any necessary servicing or
troubleshooting, without losing charge.
D. The refrigeration system shall provide at least 15° F of
liquid sub-cooling at design conditions.
4. Unit Controls:
A. Unit shall be complete with self contained low-voltage
control circuit protected by a resetable circuit breaker
fuse on the 24 volt transformer side.
B. Unit shall incorporate a lock-out circuit which provides
reset capability at the space thermostat or base unit,
should any of the following standard safety devices trip
and shut off compressor:
(1) - Loss-of-charge/Low-pressure switch.
(2) - High-pressure switch.
(3)- Freeze-protection thermostat, evaporator coil.
If any of the above safety devices trip, an LED (light-emitting
diode) indicator shall illuminate.
C. Unit shall incorporate “AUTO RESET” compressor over
temperature, over current protection.
D. Unit shall operate with conventional thermostat designs
and have a low voltage terminal strip for easy hook-up.
MECHANICAL SPECIFICATIONS
530.18-TG1Y
Unitary Products Group 21