Programming hints
Startup
The macro use the startup flag, use the Startup macro or reset the flag to 0 by yourself after controller is started.
Standalone mode
The module can be used as a standalone module, operating on the coil return water temperature.
Inputs |
Default values unused inputs |
HeatCtrlSig |
|
FilteredOAT |
|
FrostThermostat |
|
ReturnWaterTemp |
|
FailCmdAlarm |
|
PlantMode |
|
HumidityMode |
* in standalone mode the sensors has to be connected.
Damper enable alarm
To disable the damper enable alarm, set parameter DME-01 to a value of “0".
Return temperature maximum control
In case of district heating the coil return water temperature has to be limited to a maximum value as requested by the district heating supplier. Tis can be achieved with a maximum limitation control loop after the Heating Coil, to close the valve if the return water temperature is too high.
Preheater with pump and valve exercise
Example1 Pump command with status and alarm inputs, pump and valve exercise |
Example2 Pump command with pump and valve exercise, without status and alarm inputs |
The „ValveControl“ datapoint needs two connections:
The „PumpCmd“ datapoint needs two connection:
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The „ValveControl“ datapoint needs two connections:
The „PumpCmd“ datapoint needs two connection:
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You will find the macros:
in the HVAC Application Library – General.