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Building Technologies Boiler sequence controller RMK770 CE1P3132en
HVAC Products 10 Heating circuit control 23.04.2009
10.3.6 Plant operation
Plant operation indicates whether the heating circuit is switched on and whether the
pump operates.
Main menu > Heating circuit > Plant operation
Operating line Range Factory setting
Preselection Auto / Off* Auto
State On / Off
Cause Commissioning /
Frost protection for the room /
Heating limit switch /
Cooling active /
Room temp limitation max /
Optimum stop control /
Quick setback /
Quick setback + optimum stop /
Optimum start control /
Boost heating /
Boost heating + opt start /
User request room /
User request external /
Overtemp protection / Overrun /
Plant operating mode selector /
No request /
Frost protection for the flow /
Frost protection for the plant
* Frost protection functions ensured
For service purposes, the heating circuit can be shut down. In that case, the mixing
valve is driven to the fully closed position and the heating circuit pump is deactivated on
completion of the overrun time. When preselecting “Off“, the internal frost protection
function remains active.
When service work is completed, the selector must be reset to
mode.
The heating circuit’s current state is displayed (On or Off).
The reason for the current heating circuit state is displayed.
10.3.7 Control priorities in the heating circuit
The following illustration shows the priorities of the different choices of intervention via
digital inputs or the KNX bus as well as operation on the controller or on the QAW740
room unit.
Lower numbers indicate higher priorities
Plant operation
Preselection
State
Cause
⇒
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