Daikin EHBX08DA9W - Page 56

8 Configuration
Installer reference guide
56
ERGA04~08DAV3(A) + EHBH/X04+08DA
Daikin Altherma – Low temperature split
4P496758-1 – 2017.12
# Code Description
[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 condition. There is no
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 can send a separate
heating/cooling thermo ON/OFF
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.
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 10°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 Description
[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 10°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
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: when turning on the
modulation, the desired leaving water temperature will be calculated
automatically by the unit (based on the preset temperatures, if
weather-dependent is selected, modulation will be done based on
the desired weather-dependent temperatures); when turning off the
modulation, you can set the desired leaving water temperature on
the user interface. Moreover, with the modulation turned on, the
desired leaving water temperature is lowered or raised in function of
the desired room temperature and the difference between the actual
and the desired room temperature. This results in:
▪ stable room temperatures exactly matching the desired
temperature (higher comfort level)
▪ less on/off cycles (lower noise level, higher comfort and higher
efficiency)
▪ water temperatures as low as possible to match the desired
temperature (higher efficiency)
# Code Description
[2.C.1] [8‑05] Modulation:
▪ 0 No: Disabled, the desired leaving
water temperature needs to be set on
the user interface.
▪ 1 Yes: Enabled, the leaving water
temperature is calculated according to
the difference between the desired
and the actual room temperature. This
creates a better match between the
capacity of the heat pump and the
actual required capacity, and results in
less start/stop cycles and a more
economic operation.
Note: The desired leaving water
temperature can only be read out on
the user interface.
[2.C.2] [8‑06] Max modulation:
▪ 0°C~10°C
This is the temperature value by which
the desired leaving water temperature is
increased or decreased.
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