This block controls a Heating and/or Cooling source. Depending on the requirements of the assigned Room Controllers, it is decided whether the Heating or Cooling output is active.
Table of Contents
- Heating/Cooling Decision Process
- Ideal Heating or Cooling Source
- Heating Type
|To||Temperature||Value for the current Outside Temperature If this input is not connected, the value of the System Variable "Outside Temperature" is used.||º||∞|
|Ib||Boost||Boost Input Activates Level 2 (H2 or C2), and Auxiliary Heating (H3) in Heating mode.||Digital||0/1|
|St||Stop||Stop (Reset) Switches all outputs to OFF and disables further operation.||Digital||0/1|
|IH3||Auxiliary Heater||Manually activate Auxiliary Heater (H3) This can be an Immersion Heater, for example.||Digital||0/1|
|Ifl||Filter Change||Acknowledge Filter Replacement||Digital||0/1|
|Ec||Cooling Optimum||Excess or Cheap cooling available. In Cooling mode, assigned Room Controllers will overcool or allow a premature start of Cooling Systems.||Digital||0/1|
|Eh||Heating Optimum||Excess or Cheap Heating source available In Heating mode, Room Controllers will allow overheat or premature starting of Heating Systems.||Digital||0/1|
|Mh||Manual Heating Operation||Start Manual Heating Mode As long as this input is active, the requirements of the Room Controller are ignored and the Heating operation is activated. e.g. For Hot Water Treatment. Minimum Run Times are observed - If the block is currently in cooling mode, it will be extended for the duration of Tmin before switching to Heating Mode.||Digital||0/1|
|Mode||Mode||Analogue Mode Selection. Generally, Heating/Cooling only mode is started if the sum of the valve openings of the Room Controllers is more than the Switch-On Threshold. 0 = Automatic change depending on the requirements of the Intelligent Room Controllers. 1 = Heating only if there is sufficient demand. 2 = Cooling only if there is sufficient demand.||-||0...2|
|Ta||Average Temperature||Use Average Temperature If this parameter is selected, the average temperature for the last 48h will be used to select the Heating/Cooling operation. If the Average Temperature is above TLimC then only Cooling requirements are considered. If the temperature is below TLimH, only Heating requirements are considered. As long as the average over 48h has not been determined, this parameter has no effect.||Digital||0/1|
|Tc||Minimum Runtime||Minimum Runtime The minimum runtime must be met before switching to standby (All inputs OFF) or the opposite mode. Minimum openings of the room controllers are ensured.||min||∞|
|Str||Start Threshold||Switch-On threshold for Heating or Cooling demand required to start operation, measured in % of all valve openings from all connected Room Controllers.||%||0...100|
|Tdv||Valve delay||Delay required for the Heating/Cooling valve to be in operating position.||s||∞|
|Tb||Fan Overrun||Fan Overrun Duration Fan overrun duration after a heating or cooling operation to remove residual energy from the system.||s||∞|
|TPon||Time for Sequencing In||Time for Sequencing In||s||∞|
|TPoff||Time for Sequencing Out||Time for Sequencing Out||s||∞|
|StrP||Maximum Threshold for Sequencing||Maximum threshold for sequencing based on the percentage valve opening If the sum of the valve openings is smaller than this value, the Heating/Cooling outputs will cycle at intervals of 'Ton' and 'Toff'. A value of 0 disables the Timer.||s||∞|
|Tfl||Days until filter change||Days until filter change A value of 0 disables the Function||Days||∞|
|T2||Delay for 2nd stage||Delay before level 2 is enabled following the start of a heating/cooling cycle||min||∞|
|To2||Auxiliary Heating Minimum Temperature||Auxiliary Heating Minimum Temperature If the outside temperature falls below To2, Stage 2 heating is activated without delay (Activation Time T2)||º||∞|
|To||Minimum temperature for heat pump||Minimum Outside Temperature required to activate the heat pump. If the temperature falls below this value, only auxiliary heater H3 is activated during heating.||º||∞|
|TLimC||Cooling Only Temperature Limit||If the option "Use Average Temperature" is selected and the average temperature is above this value, the operation is not switched to heating, despite the request. Cooling requirements are evaluated as soon as the minimum opening (Parameter Str) of the Room Controller is exceeded.||º||∞|
|TLimH||Heating Only Temperature Limit||If the option "Use Average Temperature" is selected and the average temperature is above this value, the operation is not switched to cooling, despite the request. Heating requirements are evaluated as soon as the minimum opening (Parameter Str) of the Room Controller is exceeded.||º||∞|
There are separate Heating/Cooling Costs configured for each process. Depending on these settings, the requests are sent to the block.
Heating/Cooling Decision Process↑
The influencing factor for the decision is the sum of the requirements for all Intelligent Room Controllers in ºm2 (Temperature difference Target / Actual Temperature * Room Size). Room Size needs to be set for the Climate Controller to be able to appropriately decide when to activate its outputs. Types of Requirements: Heating, Cool, Heating for rooms with Motion, and Cooling for rooms with Motion. The respective requirements types are only evaluated if the sum of the Valve Openings is greater than the Minimum Opening set. Rooms with movement are prioritised, for example, Cooling mode can be active although the sum of all Heating requirements are greater because sufficient rooms with Motion create a Cooling request. If "Average Temperature" is connected and its value is above TLimC then only Cooling requirements are considered. If the temperature is below TLimH, only Heating requirements are considered. If the Temperature Threshold between TLimC and TLimH is the highest requirement then it will be used, otherwise only the required mode is used if the minimum request is reached. In Heating or Cooling only mode, operation is started when there is sufficient demand for the configured mode, otherwise the controller remains OFF.
Ideal Heating or Cooling Source↑
With these inputs, the Room Controllers are informed that there is excess energy available or that its respective mode would be favourable. The Rooms Controllers can then go into preparation mode before its scheduled time. If the Rooms Controllers are already in the Comfort window, they can overheat to the Upper Comfort limit or overcool to the Lower Comfort limit. This function can, for example, be used in conjunction with Solar/PV or off-peak hours to use favourable times for Heating and Cooling.
In Heating Pump/Electric mode, additional parameters and outputs are visible. Changeover Value: When switching between Heating and Cooling modes, a changeover value is set (Valve output, Parameter Valve Delay). The outputs H1 + H2 are only activated is the Outside Temperature is higher than configured with the parameter To. The output H2 is activated immediately if the Outside Temperature is lower than the value of the To2 parameter. Fan Output is activated in Heating and Cooling Mode, otherwise in Cooling only mode.