Rotex Controller Series Product Documentation page 133

EbV
Maximum
temperature limit: Buffer tank maximum temperature limit
If the temperature in the buffer tank exceeds the adjusted value, then the loading
pump is switched off. The excessive heat energy will be dissipated in preselected
circuits (see forced discharge).
The dissipation will be disabled if the temperature in the buffer tank drops 2 K below
the maximum limit.
H-GEN parallel shift: Buffer H-GEN parallel shift
In order to have sufficient heat energy stored for the heat consumers, the demand
value sent to the heat generator (H-GEN) can be increased by an additional parallel
shift.
Switching
differential: Buffer switching differential
If the buffer temperature exceeds the demand value plus the switching differential,
then the loading pump stops. It switched on again if the temperature falls below the
demand value.
Forced dissipation: Buffer forced dissipation
When the set buffer maximum temperature limit is exceeded, the excess energy can
be dissipated into the heating circuits and the hot-water tank. The heating circuits into
which the forced dissipation is routed are determined by the respective parameter.
Adjustments:
•
no heat dissipation
•
excess energy is pumped into a DHW tank
CAUTION Strongly recommended: Thermal mixing valve for DHW tank to avoid scalding.
•
Excess energy is pumped into the heating circuit(s). The adjusted maximum
temperature is not ecxeeded. The room temperature may be temporarily exceeded.
If necessary, activate thermostat function with wall unit(s).
CAUTION Strongly recommended: Strap- on thermostat for floor heating in order to switch off
the pump.
Drain function: Buffer Drain function (only with charging control)
If buffer loading by the heat generator is finished (buffer setpoint is reached), the
temperature difference between the heat generator temperature and the buffer tank
temperature (BU) is monitored constantly. If the temperature difference rises above
the set drain function switch-on differential, the buffer charging pump is switched on.
If the temperature difference drops to the drain function switch-off differential, the
buffer charging pump is switched off immediately.
This drain function ensures that excess energy in the heat generator (e.g. by post
heating) is not lost.
OFF
DHW charging pump(only with additional tank)
Heating pump(s)
Product documentation THETA NORM/UNIT
8-49