5 Operation
Operation manual
14
EWAA011~016DA + EWYA009~016DA
Packaged air-cooled water chillers
and packaged air to water heat pumps
4P620244-1B – 2021.02
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 water for different ambient
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:
X1
X2
c
d
e
Y1
Y2
Y3
Y4
a
b
Weather-dependent curve when offset is selected:
Y1
Y2
Y3
Y4
X1
X2
a
b
c
d
e
Item
Description
a
WD curve before changes.
b
WD curve after changes (as example):
▪ When slope is changed, the new preferred
temperature at X1 is unequally higher than the
preferred temperature at X2.
▪ When offset is changed, the new preferred
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,
Y3, Y4
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
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 …
Set the setpoint mode to …
Main zone – Heating
[2.4]
Main zone
>
Setpoint
mode
WD heating, fixed cooling
OR
Weather dependent
Main zone – Cooling
[2.4]
Main zone
>
Setpoint
mode
Weather dependent
Additional zone – Heating
[3.4]
Additional zone
>
Setpoint mode
WD heating, fixed cooling
OR
Weather dependent
Additional zone – Cooling
[3.4]
Additional zone
>
Setpoint mode
Weather dependent
To change the type of weather-dependent curve
To change the type for all zones (main + additional), go to [2.E]
Main
zone
>
WD curve type
.
Viewing which type is selected is also possible via [3.C]
Additional
zone
>
WD curve type
To change the weather-dependent curve
Zone
Go to …
Main zone – Heating
[2.5]
Main zone
>
Heating WD
curve
Main zone – Cooling
[2.6]
Main zone
>
Cooling WD
curve
Additional zone – Heating
[3.5]
Additional zone
>
Heating WD curve
Additional zone – Cooling
[3.6]
Additional zone
>
Cooling WD curve
INFORMATION
Maximum and minimum setpoints
You cannot configure the curve with temperatures that are
higher or lower than the set maximum and minimum
setpoints for that zone. When the maximum or minimum
setpoint is reached, the curve flattens out.
To fine-tune the weather-dependent curve: slope-offset curve
The following table describes how to fine-tune the weather-
dependent curve of a zone:
You feel …
Fine-tune with slope and
offset:
At regular outdoor
temperatures …
At cold outdoor
temperatures …
Slope
Offset
OK
Cold
↑
—
OK
Hot
↓
—
Cold
OK
↓
↑