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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
Uninterruptible Power Supply
Agility™ chillers contain an on-line double-conversion
Uninterruptible Power Supply (UPS) to ensure that the
compressor's magnetic bearing system continues to
function in the event of an power failure. The UPS (2T5)
provides power to the UC800 controls for 90 seconds
while the compressor coasts to a stop. When line
power fails, power is supplied to the UPS with an
internal battery.
When power is removed, or if the chiller's disconnect
switch is turned off, the UPS will supply power to the
UC800 controls for 90 seconds and then the UPS will
de-activate. The UPS's internal battery is not
completely discharged so that when power is restored,
the battery can provide enough power for additional
shutdowns.
The UPS has a fault indicator that is wired to a UC800
controls Low Level Intelligent Device (LLID; 1K3). If the
UPS indicates a fault, an immediate shutdown
diagnostic will be announced on the UC800 controls.
The following UPS issues could cause this diagnostic:
•
EPO Protection
•
Busbar Voltage Fault
•
IGBT Over-Temperature
•
Fan Fault
•
Battery Fault
•
Output Fault
•
Multiple Inverting Fault
Evaporator and Condenser
Heat exchangers are shell and tube design. Standard
tubes are externally finned, internally enhanced
seamless copper with lands at all tube sheets. All tube
sheets are made of carbon steel. Tubes are
mechanically expanded into tube sheets and
mechanically fastened to tube supports. Evaporator
and condenser tubes are 0.75-in. (19.05-mm) diameter.
All tubes can be individually replaced.
Shells are carbon steel plate. The evaporator is
designed, tested, and stamped in accordance with
48
ASME Code for refrigerant-side/working-side pressure
of 200 psig (1379.0 kPaG). The condenser is designed,
tested, and stamped in accordance with ASME Code
for refrigerant-side/ working-side pressure of 300 psig
(2068.4 kPaG).
All water pass arrangements are available with
grooved connections (150 psig [1034.2 kPaG] waterside
working pressure). All connections may be either right-
or left-handed. Waterside shall be hydrostatically
tested at 1.5X design working pressure.
Drive Cooling System
The drive cooling system rejects heat through a hybrid
air and fluid heat sink. The Adaptive Frequency™ Drive
(AFD) controls the fan speed to reject some of the heat
while the refrigerant expansion valve modulates to
maintain a fluid supply temperature to reject the
remaining heat.
Drive cooling circuit includes a wet rotor circulation
pump that circulates a secondary heat transfer fluid in a
closed system through the AFD heat sinks, output load
inductor 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.
Tracer AdaptiView Display
Information is tailored to operators, service
technicians, and owners.
When operating a chiller, there is specific information
you need on a day-to-day basis—setpoints, limits,
diagnostic information, and reports.
Day-to-day operational information is presented at the
display. Logically organized groups of information—
chiller modes of operation, active diagnostics, settings,
graphs, and reports put information conveniently at
your fingertips. For more information, refer to Tracer
AdaptiView Display for Water-cooled Agility Chillers
Operations Guide (HDWA-SVU001*-EN).
HDWA-SVX001D-EN
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