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RT-PRC001-EN68
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
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. All models shall have
crankcase heaters, low and high pressure
control as standard.
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.
Gas Heating Section
The heating section shall have a drum
and tube heat exchanger design using
corrosion resistant steel components. A
forced combustion blower shall supply
premixed fuel to a single burner ignited
by a pilotless hot surface ignition system.
In order to provide reliable operation, a
negative pressure gas valve shall be
used that requires blower operation to
initiate gas flow. On an initial call for heat,
the combustion blower shall purge the
heat exchanger 45 seconds before
ignition. After three unsuccessful ignition
attempts, the entire heating system shall
be locked out until manually reset at the
thermostat. Units shall be suitable for use
with natural gas or propane (field
installed kit) and shall also comply with
California requirements for low NOx
emissions. The 12½-25 tons shall have
two stage heating.
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).