Daikin EWAT_B - 4.3 Unit Mode

EWAT_B
Operating Manual
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The active setpoint can further modified using the Setpoint Reset function as explained in the section 4.10.2.
4.3 Unit Mode
The Unit Mode is used to define if the chiller is working to produce chilled or heated water. Current mode is reported in
the main page to the item Unit Mode.
Depending on the unit type, different operating modes can be selected entering, with maintenance password, in the Unit
Mode menu. In the table below are listed and explained all modes.
Parameter
Range
Description
Unit Range
Mode
Cool
Set if chilled water temperature up to 4°C is required. No glycol is generally needed
in the water circuit, unless ambient temperature may reach low values.
A/C and W/C
Cool w/Glycol
Set if chilled water temperature below 4°C is required. This operation requires proper
glycol/water mixture in the evaporator water circuit.
A/C and W/C
Cool/Ice
w/Glycol
Set in case a dual cool/ice mode is required. The switch between the two modes is
performed using the contact physical Double Setpoint.
Double Setpoint opened: the chiller will work in cooling mode with the Cool LWT
being as the Active Setpoint.
Double Setpoint closed: The chiller will work in Ice mode with the Ice LWT as the
Active Setpoint.
A/C and W/C
Ice w/Glycol
Set if Ice storage is required. The application requires the compressors to operate at
full load until the ice bank is completed, and then to stop for at least 12 hours. In this
mode the compressor(s) will not operate at part load, but will work only in on/off
mode.
A/C and W/C
The following modes allow to switch the unit between heat mode and one of the previous cool
mode (Cool, Cool w/Glycol, Ice)
Heat/Cool
Set in case a dual cool/heat mode is required. This setting implies an operation with
double functioning which is activated through the Cool/Heat switch on the electric
box
 Switch COOL: The chiller will work in cooling mode with the Cool LWT as the
Active Setpoint.
 Switch HEAT: The chiller will work in heat pump mode with the Heat LWT as the
Active Setpoint.
W/C
Heat/Cool
w/Glycol
Set in case a dual cool/heat mode is required. This setting implies an operation with
double functioning which is activated through the Cool/Heat switch on the electric
box
 Switch COOL: The chiller will work in cooling mode with the Cool LWT as the
Active Setpoint.
 Switch HEAT: The chiller will work in heat pump mode with the Heat LWT as the
Active Setpoint
W/C
Heat/Ice
w/Glycol
Set in case a dual Ice/Heat mode is required. This setting implies an operation with
double functioning which is activated through the Cool/Heat switch on the electric
box
 Switch ICE: The chiller will work in cooling mode with the Ice LWT as the Active
Setpoint.
 Switch HEAT: The chiller will work in heat pump mode with the Heat LWT as the
Active Setpoint.
W/C
Pursuit
Set in case of double water control cool and contemporary heat. Evaporator leaving
water temperature follows the Cool LWT setpoint. Condenser leaving water
temperature follows the Heat LWT setpoint.
W/C
Test
Enables the Manual Control of the unit. The manual test feature helps in debugging
and checking the operational status of actuators. This feature is accessible only with
the maintenance password in the main menu. To activate the test feature is required
to disable the Unit from the Q0 switch and change the available mode to Test.
A/C and W/C
Energy
Saving
No, Yes
Disable/Enable of the energy saving function