Controls; Dhw Temperature Control - Danfoss Termix BV Operating Manual

Operating Guide Termix BV

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 AVTB controller (20–60 °)
The temperature setting is as follows:
1 = 20 °C
2 = 35 °C
3 = 50 °C
4 = 60 °C
5 = 70 °C
The values are intended as a guide.
The AVTB operates at its best at DH supply temperatures of up to
90 °C.
Thermostatic control
DHW temperature is adjusted as follows:
To increase temperature, turn the handle on the thermostatic
controller to select a higher number.
To decrease temperature, turn the handle on the thermostatic
controller to select a lower number.
12 | © Danfoss | 2022.11
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