Bosch CW 800 - Changing the settings for DHW heating; Activating DHW heating immediately

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26 | Working with the main menu
5.4 Changing the settings for DHW heating
Menu: DHW
These settings are only available if at least one DHW system is
installed in the system. The water can be heated via a cylinder
or according to the instantaneous water heating principle.
There is a factory-set custom time program for DHW heating.
Alternatively, DHW heating is based on the time programs for
heating systems of all heating circuits or it can be constant
(Æ Chapter 5.4.3, page 27).
DHW system I or DHW system II
If two DHW systems have been installed and configured, the
settings can be changed for DHW system I or II in the same way
as for installations with one DHW system. However, changes
made in the respective menu are valid only for the selected
system.
5.4.1 Activating DHW heating immediately
If DHW is needed outside the heating phases, DHW heating can
be activated manually in this menu.
Menu: Heating once
WARNING: Risk of scalding!
If thermal disinfection has been activated to
avoid legionella, the hot water is heated once
to in excess of 65 °C. The factory setting for
the hot water temperature is 60 °C. There is a
risk of scalding at the draw-off points if the
temperature is set higher than this.
▶ Make sure that a mixer is installed. If in
doubt, ask your contractor.
Menu item Description
Start / Cancel
now
After activation of the once-only cylinder
charging, DHW is heated for the set
duration to the set temperature. When
once-only cylinder charging is active,
Start is displayed instead of Cancel now
in the menu. Select this setting for
immediate deactivation of the once-only
cylinder charging.
Temperature Desired DHW temperature
(15 to 60 °C
1)
) for the once-only cylinder
charging
1) Your contractor can only change the maximum value in the
service menu for EMS 2 heat sources or DHW heating via
MM100/MM200 modules.
Holding period Duration for the once-only cylinder
charging (15 minutes ... 48 hours)
Table 21 Settings for once-only cylinder charging