Fan Output Signals
The strategy macro provides two outputs signals for fan speed:
The variable speed control output "FanSpeedCtrlSig" will be:
The variable speed fan output signal is the maximum value between the temperature and the CO2 signals.
The fan speed command output "FanStageCmd" will be:
Fan speed control (comfort zone)
The control of fan speed, based on room/ return temperature provides a fan speed increase at high room temperature deviations outside the comfort zone.
For this function, it is absolute necessary to have a temperature sensor connected to the input RoomRetAirTemp of the module. The fan speed output signal FanSpeedCtrlSig can be controlled between 0…100%.
With the parameter RMT-04, the user can decide if the fan speed control shall increase for heating and/ or cooling.
The fan speed starts to increase for heating (see red curve in the next picture) if the room temperature reaches the value:
start point heating = CalcRoomSP - 0,5*(RMT-01)*(RMT-03) – 0,5*(RMT-05) [comfort zone]
The fan speed will be 100% if the room temperature will be equal or lower than:
end point heating = CalcRoomSP - 0,5*(RMT-01) – 0,5*(RMT-05)
Where CalcRoomSP is the calculated room temperature setpoint, containing the time program value compensated by the summer compensation and the setpoint wheel of the wall module.
The fan speed starts to increase for cooling (see blue curve in the next picture) if the room temperature reaches the value:
start point cooling = CalcRoomSP + 0,5*(RMT-01)*(RMT-03) + 0,5*(RMT-05) [comfort zone]
The fan speed will be 100% if the room temperature will be equal or higher than:
end point cooling = CalcRoomSP + 0,5*(RMT-01) + 0,5*(RMT-05)
Description |
Default value |
RMT-01: room temperature control P-band |
2 K |
RMT-02: room temperature control I-time |
0 sec |
RMT-03: span for SAT-setpoint shift |
60 % |
RMT-04: fan speed control type |
3 |
RMT-05: room temperature comfort zone |
2 K |