![background image](http://html1.mh-extra.com/html/daikin/ewad-tz-b/ewad-tz-b_operation-manual_4001229042.webp)
Air and Water cooled inverter chillers and heat pump
D-EOMZC00105-17EN
Operation Manual
42/84
EWAD TZ - EWAD TZ B -EWWD VZ
Air and Water cooled inverter chillers and
heat pump
5.1.5.5 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
5.1.5.6 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.
Parameter
Default
Range
Max Reset (MR)
5.0°C
0.0°C
10.0°C
Start Reset DT (SR
T)
5.0°C
0.0°C
10.0°C
Active Setpoint (AS)
LWT Target (LWT SP)
Cool/Ice LWT
5.1.5.7 Soft Load
Soft Loading is a configurable function used to ramp up the unit capacity over a given time period, usually used
to influence building electrical demand by gradually loading the unit. The setpoints that control this function
are:
Parameter
Description
Softload En
Enables soft loading
Softload Ramp
Duration of the soft load ramp
Starting Cap
Begin capacity limit. Unit will increase capacity from this value to 100% over the time specified by the Softload
Ramp setpoint.
4mA
20mA
Signal
AS
LWT SP
MR
LWT SP + MR
0
SR
T
Evap
T
AS
LWT SP
MR
LWT SP + MR