.Buildings.Templates.Plants.Controls.Pumps.Primary.VariableSpeed

Information

Plants with variable speed primary pumps that are not controlled to maintain differential pressure or flow setpoint

Heating-only plants

When commanded on, the primary HW pumps are commanded at a fixed speed yPumHeaWatPriSet, as determined during the Testing, Adjusting, and Balancing phase to provide the design heat pump flow.

Cooling-only plants

When commanded on, the primary CHW pumps are commanded at a fixed speed yPumChiWatPriSet, as determined during the Testing, Adjusting, and Balancing phase to provide the design heat pump flow.

Heating and cooling plants with common primary CHW and HW pumps

When commanded on, the primary pumps are commanded at a fixed speed yPumHeaWatPriSet in heating mode or yPumChiWatPriSet in cooling mode, as determined during the Testing, Adjusting, and Balancing phase to provide the design heat pump flow in heating mode or cooling mode. The operating mode of the associated heat pump is determined and latched at the time the pump is enabled.

Heating and cooling plants with separate primary CHW and HW pumps

When commanded on, the primary HW pumps are commanded at a fixed speed yPumHeaWatPriSet. When commanded on, the primary CHW pumps are commanded at a fixed speed yPumChiWatPriSet. The pump speed yPumHeaWatPriSet or yPumChiWatPriSet is determined during the Testing, Adjusting, and Balancing phase to provide the design heat pump flow in heating mode or cooling mode.

Plants with variable speed primary pumps that are controlled to maintain differential pressure or flow setpoint

Heating-only plants

The pumps are controlled as described in Buildings.Templates.Plants.Controls.Pumps.Generic.ControlDifferentialPressure. The "pump proven on" condition is evaluated based on the primary HW pump status.

Cooling-only plants

The pumps are controlled as described in Buildings.Templates.Plants.Controls.Pumps.Generic.ControlDifferentialPressure. The "pump proven on" condition is evaluated based on the primary CHW pump status.

Heating and cooling plants with common primary CHW and HW pumps

The pumps are controlled as described in Buildings.Templates.Plants.Controls.Pumps.Generic.ControlDifferentialPressure. For the HW loop, the "pump proven on" condition is evaluated based on the status of the primary pumps associated with heat pumps that are commanded in heating mode. For the CHW loop, the "pump proven on" condition is evaluated based on the status of the primary pumps associated with heat pumps that are commanded in cooling mode. The operating mode of the associated heat pump is determined and latched at the time the pump is enabled.

Heating and cooling plants with separate primary CHW and HW pumps

The pumps are controlled as described in Buildings.Templates.Plants.Controls.Pumps.Generic.ControlDifferentialPressure. For the HW loop, the "pump proven on" condition is evaluated based on the status of the primary HW pumps. For the CHW loop, the "pump proven on" condition is evaluated based on the status of the primary CHW pumps.

Revisions

• May 31, 2024, by Antoine Gautier:
  Added logic for ∆p-controlled primary pumps and latching of HP operating mode.
• March 29, 2024, by Antoine Gautier:
  First implementation.