Key (control accessories)
Greenstar 4000 – 6 720 891 171 (2020/09)
12
5
Key (control accessories)
Key LED status
The LED on the Key displays different states with flashing or constant
colours.
Table 7 LED status
5.1
Setting the time program
Time program
The same method for setting the time program for heating is used to set
the time program for hot water.
▶ Press the
key.
▶ Select and confirm the
Heat. time prog.
or
DHW time prog.
menu.
▶ Select and confirm the
Time program
menu.
The menu items
Mon - Fri
,
Sat - Sun
,
Mon
...
Sun
are displayed.
Possible items to change:
•
Mon - Fri
to change switching times for all weekdays together
•
Mon
...
Sun
to change switching times for individual days
•
Sat - Sun
to change switching times for weekends
▶ Select and confirm item you want to change.
▶ Select and confirm time entry you want to change.
▶ To change the time, press the
or
key.
▶ Press the
ok
key.
The new time is saved. Next time entry is selected.
Add one additional switching time block by sel. Delete an
existing switching time block by selecting
.
6
Shutdown
6.1
Setting frost protection
NOTICE
Risk of damage to the system from frost!
The heating system can freeze up after a prolonged period (e.g. during a
power failure, switching off the power supply, faulty fuel supply, boiler
fault etc.).
▶ Ensure that the heating system is in constant use (particularly when
there is a risk of frost).
If you are leaving your property unoccupied during cold weather, please
leave your external programmer on constant and your room thermostat
set to 12 °C.
7
Thermal disinfection (DHW cylinder only)
To prevent hot water from becoming contaminated by bacteria such as
legionella, we recommend thermal disinfection after long downtimes.
You should have a qualified engineer carry out thermal disinfection.
Description of the LED displays
Example
Flashing red:
Fault, e.g. no communication between the Key and
appliance:
▶ Install the Key again, restore the last functioning
status.
Flashing yellow:
No fault, user please wait.
Flashing green:
No fault, initialisation process is running.
Constant red:
Temporary fault:
▶ Wait for normal operating condition to be resumed.
Constant yellow:
No fault, time and date not available:
▶ Set the time and date on the appliance.
-or-
▶ Key with touch-sensitive indicator: Press touch-
sensitive indicator on Key to start pairing.
Constant green:
No fault, normal operating condition.
LED Off:
No fault, power-saving mode or appliance without power.
