10
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Configuration
Installer reference guide
149
EPRA08~W1 + ET9W
Daikin Altherma 3 H MT F
4P634887-1 – 2021.03
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 [C.2]
Space heating/cooling
=
On
.
#
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
multi-zoning wired controls (see
29]) or wireless
room thermostat (EKRTR1).
Leaving water temperature: Delta T
In heating for the main zone, the target delta T (temperature difference) depends
on the selected emitter type for the main zone.
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.
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