2-Points Curve; Slope-Offset Curve; Using Weather-Dependent Curves - Daikin EWAA004D2V3P-H Operation Manual

5.8.2

2-points curve

Define the weather-dependent curve with these two setpoints:
▪ Setpoint (X1, Y2)
▪ Setpoint (X2, Y1)
Example
Y2
Y1
X1 X2
Item
a Selected weather-dependent zone:
▪ : Main zone or additional zone heating
▪ : Main zone or additional zone cooling
X1, X2 Examples of outdoor ambient temperature
Y1, Y2 Examples of desired leaving water temperature. The
icon corresponds to the heat emitter for that zone:
▪ : Underfloor heating
▪ : Fan coil unit
▪ : Radiator
Possible actions on this screen
Go through the temperatures.
Change the temperature.
Go to the next temperature.
Confirm changes and proceed.
5.8.3

Slope-offset curve

Slope and offset
Define the weather-dependent curve by its slope and offset:
▪ Change the slope to differently increase or decrease the
temperature of the leaving
temperatures. For example, if leaving water temperature is in
general fine but at low ambient temperatures too cold, raise the
slope so that leaving water temperature is heated increasingly
more at decreasingly lower ambient temperatures.
▪ Change the offset to equally increase or decrease the
temperature of the leaving
temperatures. For example, if leaving water temperature is always
a bit too cold at different ambient temperatures, shift the offset up
to equally increase the leaving water temperature for all ambient
temperatures.
Examples
Weather-dependent curve when slope is selected:
EWAA004~008D + EWYA004~008D
Packaged air-cooled water chillers
and packaged air to water heat pumps
4P688015-1C – 2022.09
a
Description
water for different ambient
water for different ambient
a b
Y4
Y3
Y2
Y1
X1 X2
Weather-dependent curve when offset is selected:
a b
Y4
Y3
Y2
Y1
X1
Item
a WD curve before changes.
b WD curve after changes (as example):
▪ When slope is
temperature at X1 is unequally higher than the
preferred temperature at X2.
▪ When offset is
temperature at X1 is equally higher as the preferred
temperature at X2.
c Slope
d Offset
e Selected weather-dependent zone:
▪ : Main zone or additional zone heating
▪ : Main zone or additional zone cooling
X1, X2 Examples of outdoor ambient temperature
Y1, Y2, Examples of desired leaving water temperature. The
Y3, Y4 icon corresponds to the heat emitter for that zone:
▪ : Underfloor heating
▪ : Fan coil unit
▪ : Radiator
Possible actions on this screen
Select slope or offset.
Increase or decrease the slope/offset.
When slope is selected: set slope and go to offset.
When offset is selected: set offset.
Confirm changes and return to the submenu.
5.8.4

Using weather-dependent curves

Configure weather-dependent curves as following:
To define the setpoint mode
To use the weather-dependent curve, you need to define the correct
setpoint mode:
Go to setpoint mode ...
Main zone – Heating
5 Operation
c
e
d
c
e
d
X2
Description
changed, the new preferred
changed, the new preferred
Set the setpoint mode to ...
Operation manual
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