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an integral subcooling circuit. Condensers are factory
proof tested and leak tested with helium in a mass
spectrometer chamber. All tube connections are
mechanical except the brazed copper to aluminum inlet
and outlet connections. Condenser fans are direct-drive
vertical discharge. The condenser fan motors are
permanent magnet motors with an 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 fault feedback as a standard product offering. The
fan impeller is a nine bladed-shrouded fan made from
heavy-duty molded plastic. Standard units will start
and operate between 32 to 105°F (0 to 40°C) ambient.
The UC800 controls calculate optimum fan speed for
maximum efficiency based on compressor load and
outdoor air, resulting in high IPLV values
Evaporator
The evaporator is a tube-in-shell heat exchanger design
constructed from carbon steel shells and tubesheets.
Internally and externally finned seamless copper tubes
are mechanically expanded into the tube sheets. The
evaporator is designed, tested and marked in
accordance with the ASME Boiler and Pressure Vessel
Code for a refrigerant side working pressure of 200
AC-SVX001A-EN
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 flange style connections optionally
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.
Drive Cooling System
Each refrigeration circuit has a compressor drive
cooling circuit. Each drive cooling circuit is a closed
system, and includes a wet rotor pump that circulates a
secondary heat transfer fluid between the adaptive
frequency drive components, the heat sinks of the
adaptive frequency drive, and a brazed plate heat
exchanger. The pump is fed from a thermal expansion
tank with a vented-pressure cap, which is also used as
the circuit pressure relief. The circuit also includes a
particulate strainer and a drain valve for servicing.
O O p p e e r r a a t t i i n n g g P P r r i i n n c c i i p p l l e e s s
49
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