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 either the coil return water temperature, the coil discharge air temperature or both.

The return water temperature control is only proportional, while the discharge air temperature control is proportional-integral.


Inputs

Set to value if not used:

HeatCtrlSig

0

FilteredOAT

> P03

FrostThermostat

0

ReturnWaterTemp

999*

RetTmpSpOcc

22

RetTmpSpUnOcc

15

RetSetpointSelect

3

SupplyAirTemp

999

FailCmdAlarm

0

PlantMode

4


* in standalone mode one of the sensors has to be connected.


Damper enable alarm

To disable the DME_Alarm , set parameter DME-01 to a value of  “0".


Frost alarm

Connect the AHU strategy output "LowSupAirTmpAlm" to the input "FrostThermostat" of the heating coil.

To assure a correct frost procedure, connect the output "FrostAlarm" of this macro to the "FrostThermostat"input of the plant strategy macro.


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.



Pump and valve connection

how to use pump and valve exercise