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 % |