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Evaporation of the heat transfer medium must be expected by temperatures greater than 130 °C in the
collector circuit. For this reason, the control system ensures safe deactivation of the solar circuit pump.
Returning to normal operation – that is, without implementing the described regulating function of the
collector temperature limitation – is performed after the storage tank temperature has fallen to the
value 'Active from storage tank x °C' – 2K.
Note:
This function does not affect the storage tank temperature limitation ('storage tank max')
set in the 'Parameters' menu. The storage tank temperature limitation has priority and
switches off the solar circuit pump when the set maximum storing temperature is reached.
Therefore, when changing the settings ensure that the value 'Active from storage tank x°C'
is sufficiently below the value 'storage max.' (Settings -> Parameters).
When using several storage tanks the temperature sensor of the storage tank with the lowest
priority must be queried under 'input St.'. When using two separate collector surfaces, it is
helpful to check the temperature sensor of the collector array in a western direction under
'input coll..
The corresponding solar circuit pump must always be selected under 'output', never a switch
valve.
The sensor inputs "E1 (regulator)" to "E7 (regulator)" for the storage tank temperature are available on the regulator or the
inputs "E1 (IOBox)" to "E4 (IOBox)" are available on each of the four possible add-on devices (for additional IO boxes see ch.
9.1).
5.9
DVGW Heating
This function can implement the DVGW guideline to protect against legionella growth. For this
purpose, the regulator monitors the temperature at the lowest measuring point of the drinking water
storage tank ('temp. input') and ensures that these are raised to the set temperature level (adjustable:
60°C-75°C) at least once a day.
Activate the DVGW heating in the menu 'Settings -> 'Service' -> 'Functions' -> 'DVGW heating‘ by
pressing the OK button for 2 seconds (
-->
:
).
Note:
When setting the temperature it must be ensured that this temperature can also be
reached by the after-heating device used!
If the required temperature ('Heating temp.') has not been reached by the solar single feed within the
time window (12:00 P.M. until 'Heating-up period'), the storage tank is circulated to the set 'Heating-up
period' (sensibly in the evening) by a circulation pump ('output 1') in order to ensure that the entire
contents of the storage tank are heated. The actual heating of the storage tank during the circulation is
often done by an independent after-heating function of the boiler. With systems in which the after-
heating device (e.g. a conventional after-heating system, after-heating electric heating, etc.) has to be
controlled by the system regulator itself, in addition to the circulation output ('output 1'), there is an
output ('output 2') for after-heating. If this heating output is not required (independent after-heating
function of the boiler), this selection window must be blank: 'output 2: -- (----)'
If the required heating temperature is reached within the time window (0:00 until 'Heating-up period'),
DVGW heating is neither required and nor is energetically practical. The regulator detects this
independently and does not perform any additional heating.
Note:
To prevent permanent heating in the event of erroneous system design (required
temperature cannot be reached) the regulator stops every DVGW heating at 12:00 P.M.
at the latest. For this reason the heating-up period should not be programmed too
late! An ideal heating-up period would be in the early evening.
The sensor inputs "E1 (regulator)" to "E7 (regulator)" are available on the regulator or the inputs "E1 (IOBox)" to "E4 (IOBox)"
are available on each of the four possible add-on devices (for additional IO boxes see ch. 9.1).
The relay outputs "R1 (regulator)" to "R4 (regulator)" or the outputs "R1 (IOBox)" to "R3 (IOBox)" are available on each of the
four possible add-on devices.
