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 return water temperature.


Inputs

Default values unused inputs:

HeatCtrlSig

0

FilteredOAT

999

ReturnWaterTemp

999*

FailCmdAlarm

0

PlantMode

4

HumidityMode

0


* 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. This 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.



Reheater 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:

  • to this macro for valve control and
  • to the “PVE_Exercise” macro for valve exercise (if needed)


The „PumpCmd“ datapoint needs two connection:

  • to this macro for pump command
  • to the “PVE_Exercise” macro for pump exercise (if needed)

The „ValveControl“ datapoint needs two connections:

  • to this macro for valve control
  • to the “PVE_Exercise” macro for valve exercise (if needed)


The „PumpCmd“ datapoint needs two connection:

  • to this macro for pump command
  • to one of the pump command macros (e.g. „PUA_PumpCmdSimple“, „PUA_PumpCmd“)  for pump alarms and pump exercise


You will find the macros:

in the HVAC Application Library – General.