Rotex Controller Series, Product Documentation

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EbV Product documentation THETA NORM/UNIT
8-18
.
All other necessary settings are done at the boiler control. A boiler frost protection
function is not activated by the controller. This is done independently by the boiler
control.
Sensor connection: Condensing boilers with MCBA boiler controls have a connection for an outdoor and
hot water tank sensor by Honeywell. In combination with the controller series
THETA, the outdoor and hot water sensors of the standard unit as well as the
Honeywell sensors can be used. It is important to make sure that the controller
sensors are connected to the standard unit and the Honeywell sensors are
connected to the boiler control.
The following applies to both the outdoor as well as the tank sensors:
• If a sensor is connected to the standard unit, this sensor value is used for control.
• If no sensor is connected to the standard unit, a check takes place, if the
Honeywell sensor is connected to the boiler control. If so, then this sensor value
is automatically used for control.
• If a sensor is neither connected to the standard unit nor to the boiler control, an
error message is sent.
8.1.20 Heat generator forced dissipation
Forced discharge Forced discharge to the subsequent heating circuits should take place when the
DHW maximum temperature is exceeded (necessary because e.g. pellet boilers are
controlled in the same way as single stage H-GEN).
Function: The function description should be the same as for the buffer forced dissipation.
• If the current temperature of the heat generator exceeds the heat generator
maximum temperature limit, forced dissipation according to the setting of this
parameter will take place in
the DHW circuit or
the heating circuits or
a buffer tank
• The heating circuits adjust to thier maximum temperature.
• If the temperature in the heat generator decreases to 2 K under the heat
generator maximum temperature limit, forced dissipation is stopped.
• Forced dissipation is effective for multiple controllers (BUS system).
Effective parameters via MCBA for DHW mode:
Parameter Designation:
DHW
NIGHT Hot water economy temperature
LEGION.PROT.
DAY Day for legionella-protection
03 Time for legionella protection
04 Temperature for legionella protection
05 Type of DHW temperature measurement
06 DHW maximum temperature limit
07 DHW operating mode
08 DHW tank discharge protection
09 Boiler parallel shift during DHW charging
10 DHW switching differential
Operation:
Note on operation Key / parameter tree Parameter
H-GEN forced dissipation
HEAT GENER. PARAMETER 29