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Building Technologies
Boiler sequence controller RMK770
CE1P3132en
HVAC Products
10 Heating circuit control
23.04.2009
Using setting “Heating circuit = Active“, a virtual heating circuit can be activated, which
predefines heat demand according to the outside temperature or the heating curve (for
that purpose, a measured value of the outside temperature must be available), without
having this measured value available for the flow sensor and the actuating devices.
A “real heating circuit” is activated by assigning the relevant inputs (flow temperature
sensor) and outputs (heating circuit pump, mixing valve) to terminals.
For more detailed information about the virtual heating circuit, refer to section 8.2
“Weather-compensated setpoint for boiler sequencing”.
A weather-compensated heating circuit necessitates an outside temperature. A sensor
can be configured in
Main menu > Commissioning > Extra configuration > Miscellaneous >
Inputs > Outside sensor
.
The outside temperature can also be acquired via KNX bus. For more detailed informa-
tion, refer to subsection 14.5.2 “Outside temperature”.
Main menu > Commissioning > Extra configuration > Heating circuit > Inputs
Operating line
Adjustable values / remarks
Flow sensor
Room sensor
Return sensor
Return temperature limitation
Room setpoint adjuster abs
External room temperature setpoint adjuster
with absolute room temperature setpoints
Room setpoint adjuster rel
External room temperature setpoint adjuster
with room temperature setpoint readjust-
ment ±3 K
[Heating circuit pump] overload
Fault input heating circuit pump
[Heat circuit pump B] overload
Flow signal pump
Flow supervision heating circuit pump
Room operating mode
Timer function
Comfort extension
Special day input
Holiday input
Main menu > Commissioning > Extra configuration > Heating circuit > Outputs
Operating line
Adjustable values / remarks
Mixing valve 3-pos
Mixing valve modulating
Heating circuit pump
Heating circuit pump B
Heating limit relay
Operating mode relay 1
Operating mode relay 2
The internal heating circuit can be connected directly to the main header (heat distribu-
tion zone) or downstream from the primary controller (heat distribution zone on the
consumption side provided a primary controller is present).
This can be parameterized by making the following setting:
Main menu > Commissioning > Extra configuration > Heating circuit > Heat req heat circ
Operating line
Range
Factory setting
Heat req heat circuit acting on
Main distributor / Pri-
mary controller
Main distributor
Virtual heating circuit
Outside sensor
Inputs
Outputs
Heat request
heating circuit
