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PKGP-PRC001-EN
Mechanical
Specifications
General
The units shall be dedicated downflow
or horizontal airflow. The operating range
shall be between 115°F and 0°F in
cooling as standard from the factory for
all units. Cooling performance shall be
rated in accordance with ARI testing
procedures. 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. Units shall be UL listed
and labeled, classified in accordance to
UL 1995/CAN/CSA No. 236-M90 for Heat
Pumps. Canadian units shall be CSA
Certified.
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.
Unit’s surface shall be tested 500 hours
in a salt spray test in compliance with
ASTM B117. Cabinet construction shall
allow for all maintenance on one side of
the unit. Service panels shall have lifting
handles and be removeing not more
than three screws on the 12½-20 tons
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 1/2 inch, 1 pound
density matt-faced, fire-resistant,
permanent, odorless, glass fiber
material. The base of the downflow unit
shall be insulated with 1/2 inch, 1 pound
density foil-faced, closed-cell material.
The downflow unit’s base pan shall have
no penetrations within the perimeter of
the curb other than the raised 1
1
/
8
inch
high 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.
Unit Top
The top cover shall be one piece, or
where seams exist, double hemmed and
gasket sealed to prevent water leakage.
Filters
Two inch standard filters shall be factory
supplied on all units. Optional two inch
pleated media filters shall be available for
12½-20 ton models.
Compressors
External high pressure cutout shall be
provided on all 15 and 20 models. Low
pressure switches shall be standard. All
12½-20 tons 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 nameplate voltage. Internal
overloads shall be provided with the
scroll compressors. Crankcase heaters
shall be utilized with all scroll
compressors.
Refrigerant Circuits
Each refrigerant circuit shall have
independent fixed orifice or thermostatic
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, 3/8" 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 200 psig and pressure
tested to 450 psig. All dual compressor
units shall have intermingled evaporator
coils. Sloped condensate drain pans are
standard.
Outdoor Fans
The outdoor fan shall be direct-drive,
statically and dynamically balanced,
draw-through in the vertical discharge
position. The fan motor(s) shall be
permanently lubricated and shall have
built-in thermal overload protection.
Indoor Fan
Units above shall have belt driven, FC
centrifugal fans with adjustable motor
sheaves. Units with standard motors
above 12½ tons shall have an adjustable
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. All indoor fan
motors meet the U.S. Energy Policy Act of
1992 (EPACT).
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. ReliaTel 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 control shall provide anti-
short cycle timing and time delay
between compressors to provide a
higher level of machine protection.
Defrost Controls
A time initiated, temperature terminated
defrost system shall ship with a setting
of 70 with a choice of 50 or 90 minute
cycle. Timed override limits defrost cycle
to 10 minutes shall be available on all
12½-20 tons.