Daikin EWWD480CJYNN [21/28] Start up with high evaporator water temperature

4. From evaporator water Delta T: A reduction in the evaporator water Delta T -adjustable under "User" password-

corresponds to an increase in the setpoint for refrigerated water temperature control. Such control logic allows

electric energy savings when the unit works at partial load.

8. Unit Limitation

This function is useful in all those situations where a reduction in the electric consumption of the unit is necessary

during certain hours of the day.

It is possible to limit the power consumption of the unit by using any of the two options available under “User”

password.

The first way, called “Demand limit” requires a 4-20mA external signal; the unit max load decreases from 100% to 0%

as the input increase from 4mA to 20mA. Inputs lower than 4mA have no effect on the unit.

The second way, called “Current limit” requires a direct measurement of the current absorbed by the unit and the setting

of the maximum current to be absorbed (optional).

9. Soft load

This function, which can be accessed through the keypad under “User” password, limits unit load to a preset value for a

pre-determined period of time after unit start-up. This function is applicable in situations where the water temperature is

high at the start-up but thermal load is not consistently high. This logic allows to save energy during the load reduction

period by preventing the compressors from unnecessarily increasing and then decreasing their capacity.

10. Start-up with high evaporator water temperature

This function limits the load of each compressor to a set value (default 70%), until the water outlet temperature is over

the set value (default 25°C). Such logic helps start the group of chillers when the water temperature is initially very high

(35-40°C).

This feature prevents from dangerous superheating of the motor and undesirable triggering of the high pressure

protection. The values of maximum compressor load and water temperature limit are modifiable under "User" password.

11. Start-up inhibition

The controller can manage the start-up and the shut down of the unit in accordance with manifold logics in function of

the requested application.

Local On/Off: unit shutdown through controller (On/Off key). If the switch is enabled, "Off Keypad" will appear on the

status display of the unit

Remote On/Off: unit shutdown through digital contact.

If the panel switch is in the “0” position the unit is off by local switch and on the display will appear “Off Loc/Rem Sw”.

If the switch is in “Loc” position the unit is on (unless other shutdown conditions prevail).

When the switch in "Rem" position, the digital contact control allows the start-up and the shutdown of the unit from a

remote location. When the unit is stopped remotely, "Off Loc/Rem Sw”" will appear on the status display of the unit

On/Off Network: this function allows the start-up and the shutdown of the unit through a supervisory system. If the

function is enabled, "Off Rem" will appear on the status display of the unit Comm."

Ambient On/Off: this function, if enabled, allows the start-up and the shutdown of the unit through external

temperature. Enable the function under "User" password by entering the temperature value that will turn off the unit,

along with the differential temperature for re-start. In the case the function is enabled, "Off Amb. Lockout" will appear

on the status display of the unit.

On/Off Time Schedule: This function, if enabled, allows the start-up and the shutdown of the unit in accordance with a

user defined time schedule. Enable the function under "User" password by entering the start-up and shutdown time for

different weekdays and defining the holidays (forced-off days). In the case the function is enabled, "Off Time Schedule"

will appear on the status display of the unit.