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CG-PRC011-EN28
Controls
A microcomputer-based controller
controls the CGWE and CCAD scroll
chiller. The microcomputer controller
provides better control than past
controls with several new, important
benefits.
Customized Control
The microcomputer-based controller
allows Trane to customize controls
around the chiller application and the
specific components used in the scroll
chiller. For instance, the compressor
protection system is specifically
designed for the Trane scroll
compressor. The leaving chilled water
temperature control algorithm maintains
accurate temperature control, minimizes
the drift from set point and provides
better building comfort. The
microcomputer control incorporates
improved chiller start-up, load limiting,
compressor anti-recycle timing and lead/
lag functions into standard chiller
operation.
Simple Interface with Other
Control Systems
Microcomputer controls afford simple
interface with other control systems,
such as time clocks, building automation
systems and ice storage systems. Wiring
to the unit can be as simple as two
wires! You can have the flexibility to
meet job requirements without learning
a complicated control system.
Safety Controls
A centralized microcomputer offers a
higher level of machine protection. Since
the safety controls are smarter,
compressor operation can be limited to
avoid compressor or evaporator failures,
minimizing nuisance shutdown. For
instance, if the head pressure on a unit is
approaching the trip point, the controller
will turn off a compressor and display an
alarm to indicate a head pressure
problem. This keeps cooling capacity
available until the problem can be
solved. Whenever possible, the chiller is
allowed to perform its function: make
chilled water. In addition, microcomputer
controls allow for more types of
protection as standard, such as over and
under voltage! Overall, the safety
controls help keep the building running
and out of trouble.
Monitoring and Diagnostics
The microcomputer provides all control
functions and can easily indicate such
parameters as leaving chilled water
temperature and capacity stage. If a
failure does occur, one of over 40
individual diagnostic codes will be used
to indicate the problem, giving more
specific information about the failure.
The repair of the unit can occur in a
shorter period of time. All of the
monitoring and diagnostic information is
displayed directly on a microcomputer
display.
Interface with the Trane Integrated
Comfort
™
System (ICS)
When the scroll chiller is used in
conjunction with a Trane Tracer
™
system,
the unit can be monitored and controlled
from a remote location. The scroll chiller
can be controlled to fit into the overall
building control strategy by using auto/
stop, compressor inhibit and chilled
water reset functions.
All of the monitoring information
indicated on the microcomputer can be
read off the Tracer system display. In
addition, all the powerful diagnostic
information can be read back at the
Tracer system.
Best of all, this powerful capability
comes over a single twisted pair of
wires!