Submenu Screed Drying; Information On The Dhw Data Main Menu; Circulation Systems; Submenu Thermal Disinfection - Bosch Control 8313 Service Instructions For Contractors

Information on the DHW data main menu

12.4

Submenu Screed drying

If the heating system is equipped with an underfloor heating system,
a screed drying program can be set for this control.
Before activating the function:
▶ Ask the screed manufacturer for any specific screed drying
requirements.
After a power failure, screed drying continues from where it was
previously interrupted.
The interruption must not be longer than the time set in the Maximum
pause time parameter. If the interruption lasts for longer, the screed
drying is not resumed and a fault is displayed.
The screed drying can be started at any time once the parameter has
been entered.
T
VL
3
60°C
50°C
2
1
40°C
30°C
20°C
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
Fig. 21 Screed drying
t Time in days
T Supply temperature
VL
[1] Start temperature, Hold start phase
[2] Ramp-up by
[3] Increase, days
[4] Maximum temperature, Hold maximum temperature
[5] Setting back
[6] Setting back by
[7] Minimum temperature, Hold minimum temperature
The temperatures and settings for the drying period are set in the Screed
drying program ( Chapter 9.4.4, page 26).
Screed drying with a heating circuit without mixer
NOTICE:
System damage due to non-compliance with the requirements.
If the requirements for screed drying with a heating circuit without mixer
are not met, this leads to cyclical actuation of the heat source which
could damage the screed beyond repair.
▶ Comply with prerequisites.
Prerequisites for screed trying with a heating circuit without mixer:
• Floor standing condensing boiler with no requirement for the
minimum boiler temperature
• The heat intake when drying must be greater than the minimum boiler
output
36
5
6
7
4
6720 645 480-31.2O
13 Information on the DHW data main menu
13.1

Circulation systems

With circulation systems, the DHW temperature in the pipework must
not fall by more than 5 K below the DHW outlet temperature of the water
heater. Providing the hygienic conditions meet the requirements,
circulation systems can be operated at a reduced temperature for 8
hours at the most within a 24-hour period, e.g. by switching off the DHW
circulation pump, in order to save energy.
13.2

Submenu Thermal disinfection

The applicable national regulations pertaining to thermal disinfection
and the corresponding potable water installation must be observed.
If the Thermal disinfection function is selected, the DHW is heated to a
temperature once or several times a week which is high enough to kill off
germs (e.g. legionella bacteria).
Both the cylinder primary pump and the DHW circulation pump run
constantly during the thermal disinfection process.
If Thermal disinfection, Yes has been selected, thermal disinfection
starts according to the factory or customised settings.
The factory settings can be changed in further menus for thermal
t
disinfection.
If thermal disinfection has been set via the External contact WF1/3
function, the Thermal disinfection function is not displayed.
The control attempts to reach the disinfection temperature for 180
minutes. If the disinfection temperature is not achieved in this time, the
Thermal disinfection failed fault is displayed.
It is also possible to set thermal disinfection with a dedicated time
program.
Perform setting under System > Domestic hot water > Advanced
functions.
Control 8313 – 6720859567 (2017/03)