EbV Product documentation THETA NORM/UNIT
8-19
8.1.21 Operating hours counter
Function: The system has two operating hours and burner start-up counters (each for the first
and second stage). The display is in the INFO-level of the controller.
If an operating hours counter is connected to the corresponding inputs of the
controller (OHC inputs), this value is used for calculation.
Otherwise, theoretical values are determined and registered (time programs and
switching frequency of outputs).
If a signal is recognized at a OHC input and the OHC signal does not arrive after
demand by the burner, an error message is sent.
NOTE: Because the counter values are only saved in the fixed memory once a day, the
counter values of the current day may be lost if a blackout occurs.
Reset: The operating hours and starts of stage 1 and 2 can be reset separately using two
parameters in the HEAT GENER. menu.
8.2 Heating circuit
8.2.1 Weather controlled heating operation
8.2.1.1 Heating Characteristic Curve
The prerequisite for a constant room temperature is the exact setting of the heating characteristic curve (see
also the Heating Characteristic Curve section) of the relevant heating circuit as well as a correct design of
the heating system on the part of the heating technician according to the heat demand calculation.
If adjustments are necessary, these should be made in small steps at an interval of a few seconds to assure
that a steady state condition is obtained.
Differences that can be balanced by installing a room device (see available accessories) may occur
between the measured room temperature in the inhabited area and the desired room temperature.
The slope of the heating characteristic describes the relation between the change in the flow temperature
and the change in the outside temperature. In case of large heating surfaces (and therefore low flow
temperatures) like floor heating systems, the heating characteristic curve is less steep compared to smaller
heating surfaces (e. g. radiators).
The setting value refers to the lowest outside temperature used for heat demand calculation.
Operation:
Note on operation Key / parameter tree Parameter
Reset stage 1 HEAT GENER. RESET
ST-1
Reset stage 2 HEAT GENER. RESET
ST-2
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