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PMP Fault Rules

Hydronic pump fault detection rules (PMP-*). PMP-0001/PMP-0002 originate in the HVAC FDD Reference v1.0 ch.15; the later proof, cycling, stopped-flow, and expected-power rules are library-authored extensions grounded in verified graph precedents and public pump-system guidance. The family covers direct proof, hydraulic delivery, protective cycling, and baseline electrical performance without claiming a universal pump curve.

Point dictionary: points/pmp.points.json. Loop-agnostic: the same rules bind to CHW, HW, or condenser-water pumps.

Index

IDNameSevMethodStatus
PMP-0001Pump commanded on, no flow detected2ruleverified
PMP-0002Pump deadheading (high DP, low/no flow)2ruleverified
PMP-0003Pump proof-of-operation failure2ruleverified
PMP-0004Pump short-cycling3ruleverified
PMP-0005Flow through stopped pump2ruleverified
PMP-0006Pump input-power degradation3statisticalverified

All six are Phase 2. Thresholds that depend on pump size, branch design flow, sensor uncertainty, or a fitted model are explicitly site-configured on their cards.

Relationships

  • PMP-0001 vs -051 differ in what they can see: -050 needs only cmd/status/flow and catches the broad “no useful work” condition; -051 adds the DP signature that distinguishes true deadheading (valves closed against a running pump) from impeller/coupling failure (DP low). Diagnosis order in the shared vfd-pump-faults playbook follows that split.
  • VFD-0001/VFD-0002 watch the same drive from the electrical side; a deadheading pump at fixed speed shows normal VFD tracking — the families are complementary, not redundant.
  • PMP-0003 suppresses PMP-0005 on the same pump because unreliable run proof invalidates the stopped/running premise. The stopped-flow graph remains raw and the host scopes suppression by equipment instance.
  • PMP-0004 complements VFD-0004: pump starts and analog speed hunting are different signatures. Neither suppresses the other.
  • PMP-0006 relates to VFD-0001/VFD-0005 but is not globally suppressed by them. A drive finding invalidates expected power only when the deployment’s model actually consumes the disputed drive state/speed and the host can prove both rules belong to the same pump/drive.

Ontology and cluster decisions

The PR 03 point additions pin ASHRAE 223 to the inspected public-review artifact 1.0.0-ppr.2.1 (SHA-256 1f156f9938c0be430d2216e01e31bb183c438ba318d8d4a23d2f074ebcd6f573), matching the ERV/VFD expansion precedent. This is an explicit migration from the former unverified v1.0.0-2026 label, not a claim of a final release.

No Pump Delivery Failure cluster is added. Running with no flow, deadheading, proof disagreement, and flow through a stopped branch have mutually different premises and no single trigger whose correction should clear the set within the cluster contract’s 24–48 hour window.