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Air and Water cooled inverter chillers and heat pump
D-EOMZC00105-17EN
Operation Manual
38/84
EWAD TZ - EWAD TZ B -EWWD VZ
Air and Water cooled inverter chillers and
heat pump
Mode
Description
Unit Range
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
W/C
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.
W/C
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.
W/C
Test
Enables the Manual Control of the unit. The manual test feature helps in debugging and checking
the operational status of sensors and 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 (see section 5.2.2).
A/C and W/C
5.1.3
Temperature Settings
Purpose of the unit 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:
Available Modes
Double setpoint input
Scheduler state
LWT Setpoint
Setpoint Reset
Quiet Mode (A/C units only)
Operation mode and LWT setpoint can also be set via network if the appropriate control source has been
selected.
5.1.3.1 LWT Setpoint Setting
Setpoint range is limited according to the selected operating mode. The controller includes:
two set points in cooling mode (either standard cool or cool w/glycol)
two set points in heating mode (W/C units only))
one set point in ice mode
The above setpoints are activated according to Operating mode, Double Setpoint or Scheduler selection. If
the Time Scheduler is enabled the Double Setpoint input state will be ignored by the controller.
The table below lists the LWT Setpoint being activated according to the operation mode, the double setpoint
switch status and the scheduler state. The table also reports the defaults and the range allowed for each
setpoint.
Operating Mode
Units
Double
Setpoint
Input
Scheduler
LWT Setpoint
Default
Range
Cool
A/C
W/C
OFF
Off, On Setpoint 1
Cool LWT 1
7.0°C
4.0°C
15.0°C
ON
On Setpoint 2
Cool LWT 2
7.0°C
4.0°C
15.0°C
Ice
A/C
W/C
N/A
N/A
Ice LWT
-4.0°C
-8.0°C
4.0°C
Heat
W/C
OFF
Off, On Setpoint 1
Heat LWT 1
45.0°C
30.0°C
60.0°C(*)
ON
On Setpoint 2
Heat LWT 2
45.0°C
30.0°C
60.0°C(*)
(*) 30.0°C
65.0 for HT unit type
The LWT setpoint can be overridden in case the setpoint reset (for details see chapter 5.1.5.3) or the quiet
mode are activated (see chapter 5.1.6.2).