Trane PKGP-PRC001-EN - Manual (Page 48)

48 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. In
order to ensure a water and air tight seal,
service panels shall have lifting handels
and no more thatn three screws to
remove. All exposed vertical panels and
top covers in the indoor air section shall
be insulated with a 1/2 inch, 1 pound
density foil-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.
Compressors
External high pressure cutout shall be
provided on all 15 and 20 models. Low
pressure switches shall be standard. 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 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. Patent-pending 1+1+1
condenser coil, permanently gapped for
easy cleaning is available.
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
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
Adaptive demand defrost shall be
provided to permit defrost wherever coil
icing conditions begin to significantly
reduce unit capacity.