blockEnableLead_headered

Sequence for enabling lead pump of plants with headered condenser water pumps
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Information

Block that enables and disables the lead condenser water pump, for plants with headered condenser water pumps, according to ASHRAE Guideline 36-2021, section 5.20.9 Condenser water pumps, part 5.20.9.2-3.

  1. Condenser water pumps shall be lead-lag.
  2. The lead condenser water pump shall be enabled when the condenser water isolation valve of any chiller uChiConIsoVal or water side economizer uWseConIsoVal is commanded open. It shall be disabled when all chiller and water side economizer condenser water isolation valves are commanded closed.

Parameters

TypeNameDefaultDescription
Booleanhave_WSEtrueFlag of waterside economizer: true=have WSE, false=no WSE
IntegernChi2Total number of chiller

Connectors

TypeNameDefaultDescription
Buildings.Controls.OBC.CDL.Interfaces.BooleanInputuWseConIsoValWSE condenser water isolation valve commanded status
Buildings.Controls.OBC.CDL.Interfaces.BooleanInput[nChi]uChiConIsoValChiller condenser water isolation valve commanded status
Buildings.Controls.OBC.CDL.Interfaces.BooleanInputuEnaPlaTrue: plant is just enabled
Buildings.Controls.OBC.CDL.Interfaces.BooleanOutputyLeaLead pump status

Revisions

  • January 28, 2019, by Jianjun Hu:
    First implementation.