Operation Manual

6 720 645 349 (2010/09)
Adjusting the MAIN MENU | 37
Menu: Domestic hot water > Parameter > DHW
circ pump cycles
This menu point is only active if a DHW circulation
pump is available.
This menu point specifies how many times per
hour the DHW circulation pump will start during
the DHW circulation pump On phase. With the
setting:
• 1/h to 6/h, each DHW circulation pump cycle
lasts for 3 minutes.
• 7/h, the DHW circulation pump runs
continuously during the On phase.
The DHW circulation pump stops during the DHW
circulation pump Off phases.
6.4.6 Thermal disinfection of DHW
Menu: Domestic hot water > Thermal
disinfection
This menu is only active if your domestic hot
water is provided by a DHW cylinder. We
recommend that you carry out thermal
disinfection at regular intervals.
If you have a combi boiler, observe the
information in the boiler documentation.
• Operating mode:
– Auto Thermal disinfection starts
automatically in accordance with the set
start conditions. Thermal disinfection can
be started and stopped manually.
– Manual: Thermal disinfection can be
started respectively once under Operating
status.
• Operating status:
– Not running: No thermal disinfection in
progress at present. Once-only thermal
disinfection can be started by selecting
Start now.
– Running: Thermal disinfection currently in
progress. Thermal disinfection can be
stopped by selecting Stop.
If Solar sys option E Thermal disinfection
is switched on (Æ chapter 8.4 on page 51)
and thermal disinfection is stopped by
selecting Stop, a fault is indicated for 5
minutes if the disinfection temperature in
the solar cylinder has not been reached
(fault 54, Æ chapter 9.1 from page 58).
• Time: Start time for automatic thermal
disinfection.
• Time interval: Period until next start time for
automatic thermal disinfection.
WARNING: Risk of scalding!
Hot water can lead to severe
scalding.
B Only carry out thermal
disinfection at times when the
system is not normally in use.
B Inform occupants of the building
of the risk of scalding and
always monitor the thermal
disinfection process.