6 720 820 871 (2016/12) CR 400 | CW 400 | CW 800
30 | Working with the main menu
The following table shows you how to adapt the circulation settings.
5.4.5 Thermal disinfection
Following thermal disinfection, the cylinder content slowly
cools back down to the set DHW temperature. The domestic
hot water is primarily cooled down through heat loss.
Consequently, the DHW temperature may briefly be higher
than the selected temperature.
The thermal disinfection function safeguards the hygienic
quality of the DHW. The involves heating the domestic hot
water regularly to the set temperature. This also kills off
legionella for example. Thermal disinfection can be configured
in this menu.
If a DHW cylinder is connected downstream of the low loss
header, it might not be possible to reach the temperature
necessary for thermal disinfection. For more information,
consult your contractor.
This menu is only available for DHW systems with DHW
cylinder.
Operation Outcome
▶ Open the menu for the DHW settings (Æ page 28).
▶ Turn the selector to highlight Circulation.
▶ Press the selector to open the Circulation menu.
The Operating Mode menu item is highlighted.
▶ Press the selector.
▶ Turn the selector to highlight As DHW system I or II and press the selector.
The user interface operates with the modified settings. The DHW circulation pump is
only in operation when DHW heating is active. Depending on the installed system, it
may be necessary to select a DHW system.
▶ Turn the selector to highlight Own time program and press the selector.
The time program for circulation is independent of the time program for DHW heating.
The switching times can be set separately in the Circulation > My circulation time
program menu (operation as described in Chapter 5.3.2 starting on page 21). The
circulation is either switched on or off in the respective time slots.
▶ Turn the selector to highlight Off or On and press the selector.
The user interface operates with the modified settings. The DHW circulation pump is
always off in the phases with Off.
Table 26 Settings for Adapt circulation
6 720 815 237-43.1O
6 720 815 237-44.1O
CAUTION: Legionnaire's bacteria constitute a
health hazard!
▶ At low hot water temperatures thermal
disinfection or daily heating should be
activated
1)
(Æ note the drinking water
statute).
1) Daily heating can be set by your installer in the service
menu.
If the thermal disinfection is set and activated
at the heat source, the settings at the user
interface have no effect on the thermal
disinfection.
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 (e.g. Thursday night at
02:00).
▶ Only schedule thermal disinfection for
periods outside normal usage times.
▶ Make sure that a mixer is installed. If in
doubt, ask your contractor.
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