Filter
Top Products
PKGP-PRC004-EN
47
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 cleanable foil faced, fire-
retardent permanent, odorless glass
fiber material. The base of the unit shall
be insulated with 13mm, 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 29mm (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, or
where seams exist, double hemmed and
gasket sealed to prevent water leakage.
The ribbed top adds extra strength and
prevents water from pooling on unit top.
Filters
25 mm (1 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 media 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. .
Refrigerant Circuits
Each refrigerant circuit shall have
independent fixed orifice or thermal
expansion devices, service pressure
ports, and refrigerant line filter driers
factory-installed as standard. An area
shall be provided for replacement
suction line driers.
Evaporator and Condenser Coils
Internally finned, 8mm (
5
/
16
inch)
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
1,375 kPa (200 psig) and pressure
tested to 3,100 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 reversible, removeable, 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 be belt driven. Units with
belt-drive shall have an idler-arm
assembly for quick-adjustment of fan
belts and motor sheaves. All motors
shall be thermally protected. Oversized
motors shall be available for high static
application.
Controls
Unit shall be completely factory wired
with necessary controls and contactor
pressure lugs or terminal block for
power wiring. Unit shall provide an
external location for mounting a fused
disconnect device. Microprocessor
controls shall be provided 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.
Defrost Controls
Adaptive demand defrost shall be
provided to permit defrost wherever coil
icing conditions begin to significantly
reduce unit capacity.