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Parameter
Description
Unit Capacity
Displays current unit capacity
Demand Limit En
Enables demand limit
Demand Limit
Displays active demand limit
5.1.4.2
Current Limit
Current limit function allows to control unit power consumption taking current drawn below a specific limit. Starting from
the Current Limit Setpoint defined through the HMI or BAS communication, user can change the limit.
5.1.4.3
Setpoint Reset
The setpoint reset function overrides the chilled water temperature selected through the interface, when certain
circumstances occur. This feature helps in reducing energy consumption optimizing comfort as well. Three different control
strategies can be selected:
•
Setpoint Reset by an external signal (4-20mA)
•
Setpoint Reset by Evaporator ΔT (Return)
The following setpoints are available through this menu:
Parameter
Description
Setpoint Reset
Set the Setpoint Reset mode (None, 4-20 mA, Return, OAT)
Max Reset
Max Setpoint Reset (valid for all active modes)
Start Reset DT
Used on Setpoint Reset by Evaporator DT
5.1.4.4
Setpoint Reset by External 4-20 mA Signal
The active setpoint is calculated applying a correction based on an external 4-20mA signal. 4 mA corresponds to 0°C
correction, while 20 mA corresponds to a correction of the active setpoint as set in Max Reset (MR).
Parameter
Default
Range
Max Reset (MR)
5.0°C
0.0°C
10.0°C
Active Setpoint (AS)
LWT Setpoint (LWT SP)
Cool/Ice LWT
Signal
4-20mA External signal
5.1.4.5
Setpoint Reset by Evaporator Return Temperature
The active setpoint is calculated applying a correction that depends on the evaporator entering (return) water temperature.
As evaporator ΔT becomes lower than the SRΔT value, an offset to the LWT setpoint is increasingly applied, up to the MR
value when the return temperature reaches the chilled water temperature.
The Return Reset may affect negatively the chiller operation when operated with variable flow.
Avoid to use this strategy in case of inverter water flow control.
Capacity Limit
[%]
Minimum
Capacity
Maximum
Capacity
20
4
Demand Limit
[mA]
4mA
20mA
Signal
AS
LWT SP
MR
LWT SP + MR
