Daikin EWAA Series, Installation Manual

Page: 29 / 40

8 Configuration
Installation manual
29
EWAA011~016DA + EWYA009~016DA
Packaged air-cooled water chillers
and packaged air to water heat pumps
4P620240-1 – 2020.06
# Code Description
[3.4] N/A ▪ 0: Fixed
▪ 1: WD heating, fixed cooling
▪ 2: Weather dependent
If you choose WD heating, fixed cooling or Weather
dependent , the next screen will be the detailed screen with weather-
dependent curves. Also see "8.3 Weather-dependent curve" [
4
29].
Schedule
Indicates if the desired leaving water temperature is according to a
schedule. Also see
"8.2.5 Configuration wizard: Main zone" [
4
27].
# Code Description
[3.1] N/A ▪ 0: No
▪ 1:
Yes
8.3 Weather-dependent curve
8.3.1 What is a weather-dependent curve?
Weather-dependent operation
The unit operates 'weather dependent' if the desired leaving water
temperature is determined automatically by the outdoor temperature.
It therefore is connected to a temperature sensor on the North wall
of the building. If the outdoor temperature drops or rises, the unit
compensates instantly. Thus, the unit does not have to wait for
feedback by the thermostat to increase or decrease the leaving
water temperature. Because it reacts more quickly, it prevents high
rises and drops of the indoor temperature.
Advantage
Weather-dependent operation reduces energy consumption.
Weather-dependent curve
To be able to compensate for differences in temperature, the unit
relies on its weather-dependent curve. This curve defines how much
the leaving water temperature must be at different outdoor
temperatures. Because the slope of the curve depends on local
circumstances such as climate and the insulation of the house, the
curve can be adjusted by an installer or user.
Types of weather-dependent curve
There are 2 types of weather-dependent curves:
▪ 2-points curve
▪ Slope-offset curve
Which type of curve you use to make adjustments, depends on your
personal preference. See
"8.3.4 Using weather-dependent
curves" [ 4 30].
Availability
The weather-dependent curve is available for:
▪ Main zone - Heating
▪ Main zone - Cooling
▪ Additional zone - Heating
▪ Additional zone - Cooling
INFORMATION
To operate weather dependent, correctly configure the
setpoint of the main zone and additional zone. See
"8.3.4 Using weather-dependent curves" [
4
30].
8.3.2 2-points curve
Define the weather-dependent curve with these two setpoints:
▪ Setpoint (X1, Y2)
▪ Setpoint (X2, Y1)
Example
Y1
Y2
X1 X2
a
Item Description
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.
8.3.3 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 water for different ambient
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 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: