EWWQ090G ÷ EWWQ720L - R410a - Water-cooled scroll chillers
EWLQ090G ÷ EWLQ720L - R410a - Condenser less
EWHQ100G ÷ EWHQ400G - R410a - Heat pump scroll chillers
Water cooled scroll chillers & heat pump
Operation
Manual
EWWQ - EWLQ - EWHQ
Water cooled scroll chiller &heat
pump
D-EOMWC01203-15EN
Operation Manual
33
Local
Unit is enabled by local switches placed into the switchbox.
Chiller mode (cool, cool w/glycol, ice, heat, pursuit), LWT setpoint and capacity limit are determined by local settings in the
HMI.
Network
Unit is enable by a remote switch.
Chiller mode, LWT setpoint and capacity limit are determined by an external BMS. This function requires:
Remote enable connection to a BMS (unit on/off switch must be in remote)
Communication module and its connection to a BMS.
More parameters about network control can be found in 4.2.2.
5.1.2 Available Mode Setting
The following operating modes can be selected through the Available modes menu 4.6:
Cool
Set if chilled water temperature down to 4°C is required. No glycol is generally needed in the water circuit,
unless ambient temperature may reach low values.
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.
Cool/Ice w/Glycol
Set in case a dual cool/ice mode is required. This setting implies an operation with double setpoint which is
activated through a customer supplied switch, according to the following logic:
Switch OFF: The chiller will work in cooling mode with the Cool LWT 1 as the Active Setpoint.
Switch ON: The chiller will work in ice mode with the Ice LWT as the Active Setpoint.
Ice
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.
The following three modes allow to switch the unit between heat mode and one of the previous cool mode (Cool, Cool w/Glycol, Ice)
Set heat mode if warmed water temperature up to 55°C is required
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 1 as the Active Setpoint.
Switch HEAT: The chiller will work in heat pump mode with the Heat LWT 1 as the Active Setpoint.
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 1 as the Active Setpoint.
Switch HEAT: The chiller will work in heat pump mode with the Heat LWT 1 as the Active Setpoint.
Heat/Ice 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 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 1 as the Active Setpoint.
Pursuit
Set in case of double water control cool and contemporary heat.
Evaporator leaving water temperature follows the Cool LWT 1 setpoint.
Condenser leaving water temperature follows the Heat LWT 1 setpoint.
Test
Enables the Manual Control of the unit. The manual test feature helps in debugging and checking the
operational status of sensors and acutators. 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.
5.1.3 Temperature Setpoint Settings
Purpose of the chiller is to keep the evaporator leaving water temperature as close as possible to a
pre-set value, called Active Setpoint. The Active Setpoint is calculated by the unit controller based
on the following parameters and physical input
Base setpoint determined by the actual modes (Cool, Cool w/Glycol, Ice, Heat, Pursuit)
Double Setpoint (Digital input)
Setpoint Reset (4-20mA analog input)
LWT setpoint can also be set via network if the appropriate control source has been selected.
Setpoint range is limited according to the selected operating mode. The controller includes two
setpoint in cooling mode (either standard cool or cool w/glycol) and one setpoint in ice mode, which