Setpoints and related data
The setpoints and related data include the following items:
- Fan control type = fixed variable (FanCtl-Type)
- Occupied: no heat or cool % command (FanOnly-%Cmd)
- Occupied: one stage of cool % command (1ClgStg-%Cmd)
- Occupied: two stage of cool % command (2ClgStg-%Cmd)
- Occupied: three stage of cool % command (3ClgStg-%Cmd)
- Occupied: four stage of cool % command (4ClgStg-%Cmd)
- Occupied: one stage of heat % command (1HtgStg-%Cmd)
- Occupied: two stage of heat % command (2HtgStg-%Cmd)
- Occupied: three stage of heat % command (3HtgStg-%Cmd)
Note: The fixed variable economizer minimum position sequence uses the same
parameters. See Fixed variable (IntelliSpeed), for additional
information.
Inputs
No inputs are related to fixed variable fan control (Intellispeed).
Outputs
The outputs include the following items:
- 24 VAC from FAN
- 2 to 10 VDC from VFD
Operation
Fan speed is determined by the status of FAN, cooling, and heating outputs. For example, with the fan running and no cooling outputs, the FAN speed is Occupied: no heat or cool % command. Another example includes one stage of cooling operating the FAN speed is Occupied: one stage of cool % command.
In the unoccupied mode the FAN speed control is the same as in the occupied mode.
Note:
When electric heat is active, the
supply fan operates at 100%.