Filter
Top Products
45
RT-PRC016-EN
Mechanical
Specifications
General
The units shall be convertible airflow.
The operating range shall be between
46°C and -18°C (115°F and 0°F) in
cooling as standard from the factory for
all units. All units shall be factory
assembled, internally wired, fully
charged with R-22, and 100 percent run
tested to check cooling operation, fan
and blower rotation, and control
sequence before leaving the factory.
Wiring internal to the unit shall be
colored and numbered for simplified
identification.
Casing
Unit casing shall be constructed of zinc
coated, heavy gauge, galvanized steel.
Exterior surfaces shall be cleaned,
phosphatized, and finished with a
weather-resistant baked enamel finish.
Cabinet construction shall allow for all
maintenance on one side of the unit.
Service panels shall have lifting
handles and be removed and
reinstalled by removing only a single
fastener while providing a water and
air tight seal. All exposed vertical
panels and top covers in the indoor air
section shall be insulated with a
cleanable foil-faced, fire-retardent
permanent, odorless glass fiber
material. The base of the unit shall be
insulated with 13 mm, 16 kg (1/2 inch,
1 pound) density foil-faced, closed-cell
material. All insulation edges shall be
either captured or sealed.The unit’s
base pan shall have no penetrations
within the perimeter of the curb other
than the raised 29 mm (1
1
/8 inch high
downflow supply/return openings to
provide an added water integrity
precaution, if the condensate drain
backs up. The base of the unit shall
have provisions for forklift and crane
lifting, with forklift capabilities on three
sides of the unit.
Unit Top
The top cover shall be one piece
construction or where seams exist, it
shall be double-hemmed and gasket-
sealed. The ribbed top adds extra
strength and prevents water from
pooling on unit top.
Filters
One inch, throwaway filters shall be
standard on all 5 ton units. The filter rack
can be converted to two inch capability.
50 mm (2 inch) filters shall be factory
supplied on all 6-10 ton units. Optional
50 mm (2 inch) pleated filters shall be
available.
Compressors
All units shall have direct-drive,
hermetic, scroll type compressors with
centrifugal type oil pumps. Motor shall
be suction gas-cooled and shall have a
voltage utilization range of plus or minus
10 percent of unit nameplate voltage.
Internal overloads shall be provided with
the scroll compressors. Low and high
pressure switches shall be standard.
Refrigerant Circuits
Service pressure ports, and refrigerant
line filter driers are factory-installed as
standard. An area shall be provided for
replacement suction line driers.
Evaporator and Condenser Coils
Internally finned, 8 mm (
5
/16”) copper
tubes mechanically bonded to a
configured aluminum plate fin shall be
standard. Coils shall be leak tested at the
factory to ensure the pressure integrity.
The evaporator coil and condenser coil
shall be leak tested to 1375 kPa (200
psig) and pressure tested to 3100 kPa
(450 psig). The condenser coil shall have
a patent pending 1 + 1 + 1 hybrid coil
designed with slight gaps for ease of
cleaning. A removeable, reversible,
double-sloped condensate drain pan
with provision for through the base
condensate drain is standard.
Outdoor Fans
The outdoor fan shall be direct-drive,
statically and dynamically balanced,
draw-through in the vertical discharge
position. The fan motor shall be
permanently lubricated and shall have
built-in thermal overload protection.
Indoor Fan
All units shall have belt drive motors.
Units with belt drive motors shall have
an adjustable idler-arm assembly for
quick-adjustment to fan belts and motor
sheaves. All motors shall be thermally
protected. Oversized motors shall be
available for high static operations.
Controls
Unit shall be completely factory-wired
with necessary controls and contactor
pressure lugs or terminal block for
power wiring. Units shall have single
point power connection as standard.
Unit shall provide an external location
for mounting a fused disconnect device.
Microprocessor controls provide for all
24 volt control functions. The resident
control algorithms shall make all
heating, cooling, and/or ventilating
decisions in response to electronic
signals from sensors measuring indoor
and outdoor temperatures. The control
algorithm maintains accurate
temperature control, minimizes drift
from set point, and provides better
building comfort. A centralized
Microprocessor shall provide anti-short
cycle timing and time delay between
compressors to provide a higher level of
machine protection.