Daikin Altherma EAVX-D9WG Installer's Reference Manual page 49

Example: Set the minimum leaving water temperature to 28°C to
avoid NOT to be able to heat up the room: leaving water
temperatures MUST be sufficiently
temperatures (in heating).
# Code
Leaving water temperature range for the main leaving water
temperature zone (= the leaving water temperature zone with the
lowest leaving water temperature in heating operation and the
highest leaving water temperature in cooling operation)
[2.8.1] [9-01] Heating minimum 15°C~37°C
[2.8.2] [9-00] Heating maximum
▪ [2‑0C]=2 (emitter type main zone =
radiator)
37°C~60°C
▪ Otherwise: 37°C~55°C
[2.8.3] [9-02] Cooling minimum 5°C~18°C
[2.8.4] [9-03] Cooling maximum 18°C~22°C
Control
For the control of the unit there are 3 possibilities:
Control
Leaving water Unit operation is decided based on the leaving
water temperature regardless the actual room
temperature and/or heating or cooling demand
of the room.
External room Unit operation is decided by the external
thermostat thermostat or equivalent (e.g. heat pump
convector).
Room thermostat Unit operation is decided based on the ambient
temperature of the user interface used as a
room thermostat.
# Code
[2.9] [C‑07] ▪ 0: Leaving water
▪ 1: External room thermostat
▪ 2: Room thermostat
Thermostat type
Only applicable in external room thermostat control.
NOTICE
If an external room thermostat is used, the external room
thermostat will control the room frost protection. However,
the room frost protection is only possible if the leaving
water temperature control on the unit's user interface is
turned ON.
EPGA11~16DAV3 + EAVH/X16S18+23DA6V+9W
Daikin Altherma – Low temperature split
4P556070-1 – 2019.02
higher than the room
Description
In this control...
Description
# Code
[2.A] [C‑05] External room thermostat type for the
main zone:
▪ 1: 1 contact: The used external room
thermostat can only send a thermo
ON/OFF
separation between heating or cooling
demand. The room thermostat is
connected to only 1 digital input
(X2M/35).
Select this value in case of a
connection to the heat pump convector
(FWXV).
▪ 2: 2 contacts: The used external room
thermostat
heating/cooling
condition. The room thermostat is
connected to 2 digital inputs (X2M/35
and X2M/34).
Select this value in case of a
connection to the wired (EKRTWA) or
wireless (EKRTR1) room thermostat
Leaving water temperature: Delta T
The target delta T in heating for the main zone depends on the
emitter type for the main zone selected above. In heating, this
setting indicates the temperature difference between the leaving
water setpoint and entering water. In cooling, this setting indicates
the temperature difference between entering and leaving water
temperature.
The unit is designed to support under floor loops operation. The
recommended leaving water temperature for under floor loops is
35°C. In such case, the unit will be controlled to realize a
temperature difference of 5°C which means that the unit entering
water temperature is around 30°C. Depending on the installed
application (radiators, heat pump convector, under floor loops) or
situation, it can be possible to change the difference between
entering and leaving water temperature. Note that the pump will
regulate its flow to keep the delta T. In some special cases, the
measured delta T can be different 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.
# Code
[2.B.1] [1‑0B] Delta T heating: A minimum temperature
difference is required for the good
operation of heat emitters in heating
mode.
▪ If [2-0C]=2, this is fixed to 8°C
▪ Else: 3°C~10°C
[2.B.2] [1‑0D] Delta T cooling: A minimum temperature
difference is required for the good
operation of heat emitters in cooling
mode.
▪ 3°C~10°C
8 Configuration
Description
condition. There is no
can send a separate
thermo ON/OFF
Description
Installer reference guide
49