Expert area Part 2: Overview of display values and settings
44
pump has already been switched on again when the heat
generator temperature drops below the temperature [max-
imum flow temperature + 5 K].
T-HS DHW
(Heat generator superheating during hot water prepara-
tion)
Heat generator set temperature during hot water prepara-
tion = Hot water set temperature + T-HS DHW
! The heat generator must be run at a higher
temperature during hot water preparation so that the
hot water temperature in the storage tank can be
reached via the heat exchanger.
HYST DHW (Hot water charging hysteresis)
Hot water preparation is started when the temperature of
the hot water storage tank drops below the temperature
setting by the hysteresis [HYST DHW]. The hot water
preparation stops when the storage tank reaches the tem-
perature setting (the temperature setting is set to 65 °C
during hot water short time heating operation).
DHW FOLLOWUP (pump run-down time)
00 min => Standard function: The charging pump contin-
ues to run for 5 minutes after the burner has switched off.
If heat is requested by a heating circuit the run-down is
cancelled.
The charge pump blocking kicks in and can also cause the
run-down function to be cancelled.
greater than 00 min => The charge pump runs down by the
set time when storage tank charging is complete. The af-
ter-run can only be cancelled by means of the activated
charge pump blocking.
THERM INPUT (storage tank with thermostat)
00 => Hot water preparation via storage tank sensor
01 => Hot water preparation via thermostat:
The hot water preparation is started by a short circuit at the
storage tank sensor connecting terminals. It stops when
the short circuit is removed.
WALL HUNG (for modulating HG)
Heat generator set temperature during hot water prepara-
tion = Storage tank actual temperature + T-HS DHW
With this function the exhaust gas losses occurring during
hot water preparation can be reduced with modulating heat
generator using the adapted heat generator set tempera-
ture.
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