Expert area Part 3: General function description
52
EEPROM check
Every 10 minutes, a check is conducted automatically in
order to establish whether the settings of the controller lie
within the specified limits. If a value is found to be out-of-
range, it is substituted by the related default value. The
range transgression is indicated by the blinking E and the
error number 81.
In this case, the user should check the important settings
of the controller. The warning symbol is cleared after the
unit is restarted (RESET).
Circulation pump control
Switched according to heating requirement
Demand-dependent circulation pump control (automatic
summertime switchover) switches the circulation pumps off
if there is no heating demand. The mixers are closed at the
same time.
Conditions for switch-off:
Room temperature-dependent control
The room temperature exceeds the set desired tempera-
ture.
Weather-dependent control
Outside temperature exceeds room temperature set value
or flow temperature set value drops below 20 °C.
! If the room temperature factor is "0", the pump
continues to run during the reduced operation period
after a one-off heating demand.
Delayed pump switch-off
In the case of switch-off of the circulation pumps, the circu-
lation pumps are not switched off until 5 minutes later if
one of the burners was on during the last 5 minutes before
the switch-off instant.
Pump blocking protection
The controller effectively prevents blocking of the pumps if
they are not switched on for long periods. The integrated
protection function switches on all pumps which have not
been in operation during the past 24 hours for 5 seconds
at 12.00 h ours every day.
Mixer motor blocking protection
If the mixer motor has not moved for 24 hours it is fully
opened at approximately 03:00 hrs. (once only). The heat-
ing circuit pump is switched off during this time. The maxi-
mum flow temperature is monitored. Cancelled at maxi-
mum flow temperature – 5 K.
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