Weather-Dependent Curve; What Is A Weather-Dependent Curve; 2-Points Curve - Daikin Altherma 3 WS Installation Manual

6 Configuration
Settings for Schedule only mode and Schedule + reheat mode
Comfort setpoint
Only applicable when domestic hot water preparation is Schedule
only or Schedule + reheat. When programming the schedule, you
can make use of the comfort setpoint as a preset value. When you
later want to change the storage setpoint, you only have to do it in
one place.
The tank will heat up until the storage comfort temperature has
been reached. It is the higher desired temperature when a storage
comfort action is scheduled.
Additionally, a storage stop can be programmed. This feature puts a
stop to tank heating even if the setpoint has NOT been reached.
Only program a storage stop when tank heating is absolutely
undesirable.
# Code
[5.2] [6-0A] Comfort setpoint:
▪ 30°C~[6‑0E]°C
Eco setpoint
The storage economic temperature denotes the lower desired
tank temperature. It is the desired temperature when a storage
economic action is scheduled (preferably during day).
# Code
[5.3] [6-0B] Eco setpoint:
▪ 30°C~min(50,[6‑0E])°C
Reheat setpoint
Desired reheat tank temperature, used:
▪ in Schedule + reheat mode, during reheat mode: the
guaranteed minimum tank temperature is set by the Reheat
setpoint minus the reheat hysteresis. If the tank temperature
drops below this value, the tank is heated up.
▪ during storage comfort, to prioritize the domestic hot water
preparation. When the tank temperature rises above this value,
domestic hot water preparation and space heating/cooling are
executed sequentially.
# Code
Reheat setpoint:
[5.4] [6-0C]
▪ 30°C~min(50,[6‑0E])°C
Hysteresis (reheat hysteresis)
Applicable when domestic hot water preparation is scheduled
+reheat. When the tank temperature drops below the reheat
temperature minus the reheat hysteresis temperature, the tank heats
up to the reheat temperature.
# Code
[5.A] [6-08] Reheat hysteresis
▪ 2°C~20°C
6.3

Weather-dependent curve

6.3.1

What is a weather-dependent curve?

Weather-dependent operation
The unit operates 'weather dependent' if the desired leaving water or
tank 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
temperature of the leaving water or tank. Because it reacts more
quickly, it prevents high rises and drops of the indoor temperature
and water temperature at tap points.
Installation manual
32
Description
Description
Description
Description
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 temperature of the tank or leaving water must be at different
outdoor temperatures. Because the slope of the curve depends on
local circumstances such as climate and the insulation of the
building, 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
curves" [ 4 33].
Availability
The weather-dependent curve is available for:
▪ Main zone - Heating
▪ Main zone - Cooling
▪ Additional zone - Heating
▪ Additional zone - Cooling
▪ Tank (only available to installers)
INFORMATION
To operate weather dependent, correctly configure the
setpoint of the main zone, additional zone or tank. See
"6.3.4 Using weather-dependent
6.3.2 2-points curve
Define the weather-dependent curve with these two setpoints:
▪ Setpoint (X1, Y2)
▪ Setpoint (X2, Y1)
Example
Y2
Y1
X1 X2
"6.3.4 Using weather-dependent
curves" [ 4 33].
a
EWSAH/X06UDA9W
Daikin Altherma 3 WS
4P675760-1 – 2021.10