The application function "Fan-powered VAV box room temperature control for heating 11" (FpbTRCtlH11) is the hub for the sequencing of the room temperature controllers for FPB heating. It determines the room heating setpoint and the room heating demand signals to maintain the room temperature at the heating setpoint.

Setpoints in heating mode for each room operating mode

  • Heating setpoint for comfort
  • Delta heating setpoint for pre-comfort (delta between comfort and pre-comfort setpoints)
  • Heating setpoint for economy
  • Heating setpoint for protection

Optional setting 1#: Fan operation

This setting decides whether or not fan speed is influenced by coil valve position.

Note: Users need to set the following parameters:

  • Coil valve start position by parallel operation (CoilVlvSttPrl)
  • Coil valve end position by parallel operation (CoilVlvEndPrl)
  • Fan end speed by parallel operation (FanEndSpdPrl). Value of this parameter is related to the demand signal. The actual setpoint for the speed depends on the settings in the segment.

Optional setting 2#: Sequence order

DXR1 controls heating equipment following the defined sequence order in application, when the 1st equipment is reached the maximum heating capacity and cannot provide heating capacity to room, then 2nd heating equipment starts to provide heating capacity to room.

  • For energy saving purpose, the default order is “Radiator > Heated ceiling > Heating/Cooling coil > Heating coil > Fan > VAV”.
  • If one equipment in the order list is not installed, it will be skipped in control loop. “Skip” is an automatic behavior in DXR1’s application. No additional setting is required.
  • See the above figure in Optional setting 1# for exact behavior.