Operating Principles
34 RTAF-SVX001A-EN
All condenser fan motors are designed with permanently
lubricated ball bearings and internal temperature and
current overload protection.
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 forVictaulic style
pipe couplings, with flange style connections optionally
available. Waterboxes are only available in a 2 pass
configuration and include a vent, drain and fittings for
temperature control sensors. A factory installed flow
switch is installed on the supply waterbox in the
evaporator inlet connection.
Evaporators are insulated with 3/4 inch closed cell
insulation.
Evaporator shell heaters and waterbox heaters with
thermostat are provided to help protect the evaporator
from freezing at ambient temperatures down to
-4°F (-20°C).
Note: A separate field supplied 120V power source is
required to power the evaporator freeze protection.
See “Installer-Supplied Components,” p. 25 and
“Freeze Avoidance,” p. 23for more information.
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