Daikin Altherma 3 R F Installer's Reference Manual page 180

11 | Configuration
Installer reference guide
180
Delta T is the absolute value of the temperature difference between the leaving
water and entering water.
The unit is designed to support underfloor loops operation. The recommended
leaving water temperature for underfloor loops is 35°C. In such case, the unit will
realize a temperature difference of 5°C, which means that the entering water
temperature is around 30°C.
Depending on the installed type of heat emitters (radiators, heat pump convector,
underfloor loops) or situation, you can change the difference between entering
and leaving water temperature.
Note: The pump will regulate its flow to keep the delta T. In some special cases,
the measured delta T can differ from the set value.
INFORMATION
When only the backup heater is active in heating, delta T will be controlled according
to the fixed capacity of the backup heater. It is possible that this delta T is different
from the selected target delta T.
INFORMATION
In heating, the target delta T will only be achieved after some operation time, when
the setpoint is being reached, because of the big difference between leaving water
temperature setpoint and inlet temperature at startup.
INFORMATION
If the main zone or the additional zone has a heating demand, and this zone is
equipped with radiators, then the target delta T that the unit will use in heating
operation will be 8°C fixed.
If the zones are not equipped with radiators, then in heating the unit will give priority
to the target delta T for the additional zone, if there is a heating demand in the
additional zone.
In cooling the unit will give priority to the target delta T for the additional zone, if
there is a cooling demand in the additional zone.
# Code
[2.B.1] [1‑0B]
[2.B.2] [1‑0D]
Leaving water temperature: Modulation
Only applicable in case of room thermostat control.
When using the room thermostat functionality, the customer needs to set the
desired room temperature. The unit will supply hot water to the heat emitters and
the room will be heated.
Additionally, also the desired leaving water temperature must be configured: if
Modulation is enabled, the unit automatically calculates the desired leaving
water temperature. These calculations are based on:
Description
Delta T heating: A minimum temperature
difference is required for proper operation of
heat emitters in heating mode.
▪ If [2-0C]=2, this is fixed to 8°C
▪ Else: 3°C~10°C
Delta T cooling: A minimum temperature
difference is required for proper operation of
heat emitters in cooling mode.
▪ 3°C~10°C
ERLA11~16DAV3+W1 + EBVH/X11+16S18+23DJ
Daikin Altherma 3 R F
4P643602-1 – 2021.09