Controls
- With the ability to detect surge, UCP2 can call for corrective action to be taken to prevent a surge failure. If the system can
respond within 15 minutes, the chiller will continue to
operate until further corrective action can be taken.
- With the ability to function across a broader operating map, UCP2, in conjunction
with the multiple-stage compressor, can provide safe
operation when undesirable inputs to the chiller
are encountered. This capability includes:
- cold condenser start
- running with hot condenser water
- low condenser water flow
- hot evaporator start
- varying water/fluid loop flow operation
- return from momentary power losses in less than one minute
- smart restart inhibit designed to get the chiller back on line fast
- With more diagnostics and diagnostic history that are time/date stamped and with help messages, the operator or serviceman
can take faster and more effective corrective action.
- With the new stepper motor/inlet guide vane actuator, the same technology used in the machine tool industry offers
highly reliable and precise inlet vane control.
Systems Performance
"Chilled Water System" encompasses many levels of control: Standalone Chiller, Chiller Plant, Applied System, Central
Building Automation System. However, regardless of the
system level being designed, the unit controls become critical not just in making every level operate reliably but in facilitating
optimal performance. UCP2 provides more capability and
more intelligence to make this operation/ optimization possible:
Unit Level
- factory mounted water temperature sensors
- kW demand limiting for those installations where avoidance of demand
charges is more critical than maintaining capacity.
- chilled water reset (based on return water temperatures or ambient temperature
or based on a 4-20 ma signal) for those installations
where energy savings is more critical than maintaining design leaving chilled water temperature at part loads.
- variable speed drive for those installations in which the chiller is operating
at part load conditions a significant percentage of the
time and where cold condenser water is available.
- hot gas bypass for those process installations where the chiller will need to
respond quickly to sudden load increases.
- ASHRAE Guideline 3 Report incorporated
into the Chiller Report and Printer Report. Guideline 3
aids operators in managing refrigerant assets.
Chiller Plant Level
- heat recovery — to take advantage of waste heat from the chiller for heating applications.
- heat pump — for those applications in which heating is the primary mission of the chiller and cooling is a waste product
(requiring an endless source of heat such as a well or
lake water).
- free-cooling — for use in those parts of the country where cold condenser water
is available to eliminate the need to operate the
compressor.
- variable flow — for applications where either the condenser water or the system
water flows must vary.
- ice-making — for demand charge avoidance or for additional capacity needs and where no cooling requirements exist
for considerable periods of time.
- low condenser gpm for chiller plant optimization.
- cooling tower reset based on head pressure for tower optimization.
- low evaporator fluid temperature for process applications.
Applied Systems
- low evaporator fluid temperature for cold air/humidity control applications.
- variable fluid flow where evaporator flow is modulated by a device outside the control of the chiller or the chiller plant.
Building Automation Systems
Optional Interfacing available to: Tracer 100 products — without the need for a System Control Panel Generic
Building Automation System (either hardwired points)
Printer port (RS-232) |
