Constant supply air temperature control

This macro provides constant supply air temperature control with summer and winter compensation. The supply air temperature is PI-controlled with a setpoint, defined by the value of the internal datapoint SupplyAirTempSp.


Note: The module input ContrPtAdj provides a remote control point adjustment for the supply air temperature setpoint, when it is connected to the ContrPtAdj output of a wall module macro. The value of the ContrPtAdj input can vary between plus and minus, while zero means no shift of the original setpoint.

Description

Default value

SAT-03: supply air temp. control P-band

200 K

SAT-04: supply air temp. control I-time

50 sec


Winter compensation of supply air temperature setpoint

To eliminate increased building transmission losses and from the comfort point of view (during the winter period), a higher supply air temperature is desired. With decreasing outside temperatures, the supply air temperature setpoint is reset as defined by parameters WCS-01 and WCS-02.

The winter compensation raise is defined by parameter WCS-03, shifting the supply air temperature setpoint between the respective minimum and maximum limit setpoints SAT-01 and SAT-02 upwards.


Description

Default value

SAT-01: supply air temperature low setpoint

14 °C

SAT-02: supply air temperature high setpoint

35 °C


Note: If parameter WCS-03 is set to “0”, there will be no winter compensation.



Description

Default value

WCS-01: start point OAT winter comp. SAT

-10 °C

WCS-02: end  point OAT winter comp. SAT

10 °C

WCS-03: supply air temperature setpoint raise

4 K


Summer compensation of supply air temperature setpoint

To save cooling energy during the summer period, the room temperature setpoint is reset by the outside air temperature, defined by parameters SCR-01 and SCR-02.

The summer compensation setpoint raise is defined by parameter SCR-03.


Note: If parameter SCR-03 is set to “0”, there will be no summer compensation.


Description

Default value

SCR-01: start point OAT summer comp. SAT

28 °C

SCR-02: stop point OAT summer comp. SAT

34 °C

SCR-03: supply temperature setpoint raise

0 K


Sequential control of the output signals, based on supply air temperature

The control strategy module provides sequencing output control signals for heating, energy recovery and cooling.

With the parameters SAT-05 to SAT-12 the start- and the end-point of each output signal can be adjusted, based on supply air temperature control, as shown in the next example.


Note: The end-point parameters must always have a higher value then the start- point parameters. If both start- and end-point parameters are set to “0”, then that particular sequence function will be inactive.



Description

Default value

SAT-05: sequence start point heating valve

0 %

SAT-06: sequence end point heating valve

50 %

SAT-09: sequence start point energy recovery

50 %

SAT-10 :sequence end point energy recovery

75 %

SAT-11: sequence start point cooling valve

75 %

SAT-12: sequence end point cooling valve

100 %