.Buildings.Controls.OBC.ASHRAE.G36.FanCoilUnits.Controller

Information

Block for fan coil unit control. It outputs supply fan enable signal and speed signal, the supply air temperature setpoint, the zone air heating and cooling setpoints, and commanded valve positions for heating and cooling coils.

It is implemented according to the ASHRAE Guideline 36-2021, Part 5.22.

The sequences consist of the following subsequences.

Supply fan control

The supply fan control is implemented according to Part 5.22.4. It outputs the control signals for supply fan enable yFan and the fan speed yFanSpe. See Buildings.Controls.OBC.ASHRAE.G36.FanCoilUnits.Subsequences.FanSpeed for a detailed description.

Supply air temperature setpoint

The supply air temperature setpoint control sequences are implemented based on Part 5.22.4. The block outputs a supply air temperature setpoint signal TSupSet, and control signals for the heating coil yHeaCoi and the cooling coil yCooCoi. See Buildings.Controls.OBC.ASHRAE.G36.FanCoilUnits.Subsequences.SupplyAirTemperature for a detailed description.

Zone air heating and cooling setpoints

The zone air heating setpoint TZonHeaSetand cooling setpoint TZonHeaSet as well as system operation mode signal modSetPoi.yOpeMod are described at Buildings.Controls.OBC.ASHRAE.G36.AHUs.SingleZone.VAV.SetPoints.ModeAndSetPoints.

Plant requests

The plant requests are implemented based on Part 5.22.8. The block outputs a chilled water plant request yChiPlaReq, chilled water supply temperature reset request yChiWatResReq, hot water plant request yHotWatPlaReq and hot water supply temperature reset request yHotWatResReq. See Buildings.Controls.OBC.ASHRAE.G36.FanCoilUnits.Subsequences.PlantRequests for a detailed description.

Revisions

• November 20, 2025, by Karthik Devaprasad:
  Added error scaling factors to PI blocks for heating and cooling loop signal generation.
• March 22, 2022, by Karthik Devaprasad:
  First implementation.