Catalogue

54 RLC-PRC042D-EN
Mechanical Specifications
General
Units are leak and pressure tested at 390 psig high side, 250 psig low side, then evacuated and
charged. All Stealth™ RTAE Chillers are factory tested prior to shipment. Packaged units ship with
a full operating charge of oil and refrigerant as standard. Units can also be shipped with a nitrogen
charge if required. Unit panels, structural elements and control boxes are constructed of galvanized
steel and mounted on a bolted galvanized steel base. Unit panels, control boxes and the structural
base are finished with a baked on powder paint. All paint meets the requirement for outdoor
equipment of the US Navy and other federal government agencies.
Refrigeration Circuits
All Stealth chiller sizes are available with two refrigerant circuits. For 150T and 165T units, a single
refrigeration circuit option is available.
Each refrigeration circuit includes one rotary screw compressor, a compressor suction and
discharge service valve, liquid line shutoff valve, removable core filter, liquid line sight glass with
moisture indicator, charging port and an electronic expansion valve. Fully modulating
compressors and electronic expansion valves provide variable capacity modulation over the entire
operating range.
Evaporator
The evaporator is a tube-in-shell heat exchanger design constructed from carbon steel shells and
tubesheets with internally and externally finned seamless copper tubes mechanically expanded
into the tube sheets. The evaporator is designed, tested and stamped in accordance with the ASME
Boiler and Pressure Vessel Code for a refrigerant side working pressure of 200 psig. The evaporator
is designed for a water side working pressure of 150 psig. Standard water connections are grooved
for Victaulic style pipe couplings, with groove to flange style adapters available. Waterboxes are
available in 2 and 3 pass configurations and include a vent, a drain and fittings for temperature
control sensors. Evaporators are insulated with 3/4 inch closed cell insulation. Evaporator water
heaters with thermostat are provided to help protect the evaporator from freezing at ambient
temperatures down to -20°F (-29°C). A factory installed flow switch is installed on the supply water
box in the evaporator inlet connection.
Condenser and Fans
Air-cooled condenser coils have aluminum fins mechanically bonded to internally finned seamless
aluminum tubing. The tubing is a long life alloy designed to deliver corrosion performance that
meets or exceeds microchannel coils. The condenser coil has an integral subcooling circuit.
Condensers are factory proof tested at 525 psig and leak tested with helium in a mass spectrometer
chamber at 150 psig. All tube connections are mechanical except the brazed copper to aluminum
inlet and outlet connections. The copper to aluminum connections are protected against galvanic
corrosion. Corrosion resistant coil coating is available if the installation site is near the ocean or in
an otherwise corrosive environment. See “Options,” p. 57.
Condenser fans are direct-drive vertical discharge. The condenser fan motors are permanent
magnet motors with integrated drive to provide variable speed fan control for all fans and are
designed with permanently lubricated ball bearings, internal temperature and current overload
protection, and customer fault feedback as a standard product offering. The fan impeller is a nine
bladed-shrouded fan made from heavy-duty molded plastic.
Compressor and Lube Oil System
The rotary screw compressor is semi-hermetic, direct drive with capacity control via a variable
speed drive, rolling element bearings, differential refrigerant pressure oil flow and oil heater. The