Controls; Dhw Temperature Control - Danfoss Termix BL Operating Manual

Operating Guide

6.0 Controls

6.1 DHW temperature control

DHW temperature control
There are various types of DHW temperature control used in
Danfoss substations.
DHW temperature should be adjusted to 45-50 °C, as this provides
optimal utilisation of DH water. At DHW temperatures above 55 °C,
the possibility of lime scale deposits increases significantly.
Two valves in cascade
If two thermostatic control valves are mounted parallel in cascade,
it is important to adjust the valves according to the following: The
small valve is for controlling small tapping flows and the large valve
is for controlling large tapping flows.
1. The large valve is closed completely (the handle is turned all
the way to the top).
2. One tap is opened.
3. The small valve is set at the desired temperature (50 °C). The set
point is marked and the valve is closed completely.
4. Several taps are opened and the large valve is set 3-5 °C lower
than the small valve.
5. The handle of the small valve is turned back to the marked
point.
Please note
It is important that the small valve is set 3-5 °C higher than the
large valve; otherwise it is not possible to control the temperature
of small tapping flows correctly.
6.1.1 Electronic control
Substations with electronic control must be set in accordance with
manufacturer´s instructions.
Where the room temperature is controlled by radiator thermostats,
it is recommended that thermostats be set for minimum
temperature in each room.
12 DEN-GT
Termix BL
VI.EH.D4.02 / LUK41570
Danfoss District Energy