Daikin EWWDC11EJYNN/A [15/26] Features
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Daikin EWWDC11EJYNN/A [15/26] Features

Daikin EWWD550EJYNN [15/26] Features
• Chillers • R-134A • EWWD-EJYNN
1
3
• Applied Systems • Chillers
15
3 Features
The PCO2 controller
PCO2 device is installed as standard on all the units; it can be used to alter unit set points and control
commands. A display illustrates the machine's operating status and programmable parameters (setpoints)
e.g. temperatures and pressures of fluids (water, refrigerant). Device controls maximise the Daikin chillers
energy efficiency and reliability characteristics. It uses sophisticated software with predictive logic to select
the most energy efficient combination of compressor, EEV to maintain stable operating conditions and
maximise energy efficiency. The compressors are automatically rotated to ensure equal operating hours.
Microprocessor device protects critical components in response to external signals from its system sensors
measuring: motor temperatures, refrigerant gas and oil pressures, electrical supply and evaporator.
Control section - main features:
• Management of the compressor capacity slide 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 thermal load
- High evaporator entering water temperature (start-up)
• Display of evaporator entering/leaving water temperature
• Display of condensing-evaporating temperature and pressure, superheat temperature for each
circuit
• Leaving water cooled temperature regulation (also available entering water regulation).
Temperature tolerance=0,2°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
• Automatic re-start in case of power supply interruption
Safety for each refrigerant circuit
High pressure (pressure switch)
Low pressure (pressure switch)
Oil differential pressure switch
Compressor thermal
High Discharge Temperature on the compressor
Phase Monitor
Star / Delta Transition Failed
Low Delta Pressure between Suction and Discharge
System security
A serious alarm input (stops the unit)
A flow controller input (stops the unit)
A pump thermal input (stops the unit)
Remote on/off input without alarm signaling
Regulation type
Proportional or proportional + integral regulation on the evaporator input probe.

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