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Controller
controller is installed as standard on all the units; it can be used to modify unit set points and check control
parameters. A display illustrates the machine's operating status, programmable values and set points e.g.
temperatures, and pressures of fluids (water, refrigerant). Device controls maximize the DAIKIN chillers
energy efficiency and reliability characteristics. It uses sophisticated software with predictive logic to select
the most energy efficient combination of compressor, electronic expansion valve and condenser fan to keep
stable operating conditions and maximize energy efficiency. The compressors are automatically rotated to
ensure equal operating hours. controller protects critical components in response to external signals from its
system sensors measuring: motor temperatures, refrigerant gas and oil pressures, correct phases sequence
and phase loss.
Control section - main features:
•
Management of the compressor capacity slide and the electronic expansion valve according to the
distributed multiprocessor logic system
•
Chillers enabled to work in partial failure condition thanks to the distributed multiprocessor logic
system
•
Full routine operation at condition of:
-
High ambient temperature value
-
High thermal load
-
High evaporator entering water temperature (start-up)
•
Display of evaporator entering/leaving water temperature
•
Display of condensing-evaporating temperature and pressure, suction and discharge superheat
temperature for each circuit
•
Leaving water cooled temperature regulation. Temperature tolerance
±
0,1°C
•
Compressors and evaporator/condenser pumps hours counter
•
Display of Status Safety Devices
•
Start up numbers and compressors working hours equalization
•
Excellent management of compressors load
•
Cooling tower’s fans management according to condensing pressure
•
Automatic re-start in case of power supply interruption (adjustable)
•
Soft Load
•
Return Reset
•
AOT Reset
•
Set-point Reset
•
Demand limit or Current limit
•
Speedtrol control (optional)
Safety for each refrigerant circuit
High pressure (pressure switch)
Low pressure (pressure switch)
Compressor overload
Condensation fan Magneto-thermal
High Discharge Temperature on the compressor
Phase Monitor
Star / Delta Transition Failed
Low Delta Pressure between Suction and Discharge
Low pressure ratio
High oil pressure drop
Low oil pressure
Summary of Contents for EWAP 800-C18AJYNN
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