Daikin EWWDC19CJYNN [4/28] Main features of control software

2. Main features of control software

• Management of water-cooled chillers.

• Control of the outlet temperature of evaporator, condenser, or both.

• Control of leaving water within ± 0.1 °C (under stable load conditions).

• Management of sudden load drops of up to 50% with max 3°C controlled temperature oscillation.

• Readout of all the main operating parameters of the unit (temperatures, pressures, etc.).

• Automatic control of primary evaporator and condenser pumps.

• Control of up to 4 steps of cooling tower plus regulation bypass valve with a proportional 0-10 Vdc signal.

• Dual setpoint through local or remote change-over switch. This function allows switching of the local setpoint

between two preset values.

• Setpoint override using an external (4-20 mA) signal –either outside ambient temperature or evaporator return

temperature.

• Adjustable Max Pull-Down rate reduces under-shoot during low demand in the control loop.

• Hot-water start feature allows the unit to start smoothly even under high temperature condition of evaporator

water.

• SoftLoad feature reduces electrical consumption and peak demand charges during loop low demand.

• Power-limiting feature reduces the electrical consumption of the unit by limiting either current (current limit) or

capacity demand (demand limit).

• Fan Quiet Mode feature helps reduce noise by limiting the speed of the fans in accordance with a time schedule

• Panel-mounted 15-key keypad for quick interfacing. The operator can log the chiller operating conditions on the

4-line by 20-column backlit display.

• Four levels of security protection against unauthorized changes.

• Compressor diagnostic system that includes logging of the last ten alarms and information on date, time and

current operating conditions at the time the alarm was activated.

• Weekly and yearly start-stop time schedule.

• Ambient Lockout feature allows the unit shutdown based on outside ambient temperature.

• Easy integration into building automation systems via separate 4-20 mA signals for chilled water temperature

setpoint and limitation of demand.

• Communication capabilities for remote monitoring, changing of setpoint, trend logging, alarm and event

detection, via compatible IBM-PC running monitoring software 2.0 or later.

• BMS communication capability via Modbus, LonWork, Johnson Metasys.

• Remote communication capabilities via modem (up to 8 chillers with Gateway Modem).

• Remote communication capabilities via GSM Modem.