EWAT_B
Operating Manual
19/38
5
4 < < 7.2
5
7.2 < < 10.4
4
10.4 < < 13.6
3
13.6 < < 16.8
2
16.8 < < 20.0
1
6
4 < < 6.7
6
6.7 < < 9.3
5
9.3 < < 12
4
12 < < 14.7
3
14.7 < < 17.3
2
17.3 < < 20
1
All info about this function are reported in the
Main Menu
Commission Unit
Configuration
Options
Demand
Limit
page.
4.10.2
Setpoint Reset
The “Setpoint Reset” function is able to override the chilled water temperature active setpoint when certain circumstances
occur. The aim of this function is to reduce the unit energy consumption whilst maintaining the same comfort level. To this
purpose, three different control strategies are available:
Setpoint Reset by Outside Air Temperature (OAT)
Setpoint Reset by an external signal (4-20mA)
Setpoint Reset by Evaporator ΔT (EWT)
In order to set the desired setpoint-reset strategy, go to
Main Menu
Commission Unit
Configuration
Options
and modify the
Setpoint
Reset
parameter, according to the following table:
Parameter
Range
Description
LWT Reset
No
Setpoint reset not enabled
4-20mA
Setpoint reset enabled by an external signal between 4 and 20mA
DT
Setpoint reset enabled by Evaporator Water Temperature
OAT
Setpoint reset enabled by Outside Air Temperature
Each strategy needs to be configured (although a default configuration is available) and its parameters can be set
navigating to
Main Menu
View/Set Unit
Power Conservation
Setpoint Reset.
Note that the parameters corresponding to a specific strategy will be available only once the Setpoint Reset has been set
to a specific value and the UC has been restarted.
