257098-BTG-A-0506
Unitary Products Group
37
GUIDE SPECIFICATIONS
GENERAL
Units shall be manufactured by Unitary Products Group in an
ISO 9001 certified facility.
BCB Series units are convertible single package heat pumps.
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. Models are avail-
able 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 over-
head 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,
remove the supply and return air panels on the rear of the
unit.
All non-Scroll compressors include crankcase heaters and all
compressors have internal pressure relief. Every refrigerant
circuit includes 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 a compressor lockout circuit, 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 ASTMB117 procedures. All models
are CSA listed. All models include a 1-year limited warranty
on the complete unit. Compressors and electric heater ele-
ments carry a 5-year warranty.
DESCRIPTION
Units shall be factory-assembled, single packaged heat
pumps designed for outdoor mounted installation.
The units shall have minimum SEER ratings of 10.0. 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. All units
the cooling performance shall be rated in accordance with
DOE and ARI test procedures. Units shall be CSA listed,
classified to ANSI Z21.47, UL 1995/CSA No. 236 standards.
UNIT CABINET
Unit cabinet shall be constructed of G90 galvanized steel,
with exterior surfaces coated with a non-chalking, powdered
paint finish, certified at 1000 hours salt spray test per
ASTMB117 standards. Indoor blower section shall be insu-
lated with a minimum 1/2” 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. Cabinet
panels shall be “large” size, easily removable for servicing
and maintenance. Full perimeter base rails shall be provided
to assure reliable transit of equipment, overhead rigging and
proper sealing on roof curb applications. Disposable 1" 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 perfor-
mance 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. Condensate pan shall be internally sloped
and conform to ASHRAE 62-89 self-draining standards. Con-
densate connection shall be a minimum of 3/4” I.D. female
and be a ridged mount connection.
INDOOR (EVAPORATOR) FAN ASSEMBLY
The indoor fan shall be direct drive, multi-speed, or a factory
installed belt drive assembly that includes 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 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 mainte-
nance.
OUTDOOR (CONDENSER) FAN ASSEMBLY
The outdoor fan shall be of the direct-driven propeller type,
discharge air vertically, have aluminum blades riveted to a
corrosion resistant steel spider bracket and shall be dynami-
cally balanced for smooth operation. The outdoor fan motor
shall be totally enclosed with permanently lubricated bear-
ings, internally protected against overload conditions and
staged independently.
REFRIGERANT COMPONENTS
Compressor:
a.
Shall be internally protected with internal high-pres-
sure relief and over temperature protection.
b.
Shall have internal spring isolation and sound muf-
fling to minimize vibration and noise, and be exter-
nally isolated on a dedicated, independent
mounting.
Coils:
a.
Evaporator and condenser coils shall have alumi-
num plate fins mechanically bonded to seamless
internally enhanced copper tubes with all joints
