Daikin EWAT_B - 4.10.2.3 Setpoint Reset by DT

EWAT_B
Operating Manual
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Graph 3 External signal 4-20mA vs Active Setpoint - Cooling mode(left)/ Heating mode(right)
4.10.2.3 Setpoint Reset by DT
When the DT is selected as Setpoint Reset option, the LWT active setpoint(AS) is calculated applying a correction based
on the temperature difference ΔT between the leaving water temperature(LWT) and the evaporator entering(returning)
water temperature (EWT). When the |ΔT| becomes smaller than the Start Reset ΔT setpoint(SRΔT), the LWT active
setpoint is proportionally increased (if Cooling mode set) or decreased (if Heating mode is set) of a maximum value equal
to the Max Reset(MR) parameter.
Parameter
Default
Range
Description
Actual Reset
Actual Reset shows which is the correction that will applied to the
base setpoint
Max Reset (MR)
5.0°C
0.0°C  10.0°C
Max Reset setpoint. It represents the maximum temperature
variation that the selection of the 4-20mA option can cause on the
LWT.
Delta T
Is the actual evaporator delta temperature. Entering – Leaving
water temperature
OAT
Actual outside ambient temperature
Signal
Actual input current read on the terminals Setpoint Reset
4mA
20mA
Signal
Active
Setpoint
LWT SP
MR
LWT SP + MR
4mA
20mA
Signal
Active
Setpoint
LWT SP - MR
MR
LWT SP