Weighted score of the six operating sequences the plant's BMS is supposed to hold — a chiller running with its chilled-water pump, its condenser-water pump, and a cooling tower, distribution following production, and everything off together when the plant is off. A low score means the plant is being run out of sequence: auxiliaries burning energy with no chiller behind them, or a chiller running unprotected. Target ≥ 95%.
A weighted compliance score across the six operating sequences (BMS interlocks) that a central chiller plant should hold at all times. It measures whether the plant is being operated the way it was designed to run — production and heat-rejection equipment staged together, distribution following production, and auxiliaries shut down when no chiller is calling. It is an operational-discipline signal about how the plant is run, not a mechanical-health signal about any single machine.
Each sequence N is scored over the period as the share of valid intervals in which the interlock held — seq_N_compliance = count(sequence satisfied) / count(sequence evaluable) × 100 — evaluated only when the antecedent equipment is ON (a chiller-to-pump interlock is not scored while every chiller is off).
The plant score is the weighted average of the six sequences, weighted by criticality. The three critical interlocks protect the running chiller; the three high interlocks cover distribution and shut-down discipline.
Sequence weights: 01 Chiller to chilled-water (CP) pump — 0.25, critical; 02 Chiller to condenser-water (CC) pump — 0.20, critical; 03 Chiller to cooling tower — 0.20, critical; 04 CHW (CP) pump to distribution (CS) pump — 0.15, high; 05 Tower to condenser-water (CC) pump — 0.10, high; 06 System-off consistency, all chillers off implies pumps and towers off — 0.10, high.
The metric is read from the BMS interlock and run states only — it reads the plant, it does not command it. A breach is surfaced with the sequence that failed and how often; the correction is a change to the BMS sequence logic, which is made by the customer's plant-service vendor, not by Keedian.
| Range | Classification | Interpretation |
|---|---|---|
| Plant score ≥ 95% (and each critical sequence ≥ 95%) | Expected — in sequence | The BMS is holding its interlocks; production, heat rejection, and distribution are staged together and auxiliaries shut down with the plant. |
| Plant score 80 – 94%, or any critical sequence below 95% | Intermittent breaches — monitor | The plant leaves sequence often enough to waste auxiliary energy or run a chiller with thin protection; scope the failing interlock with the plant vendor. |
| Plant score below 80%, or a critical sequence persistently failing | Out of sequence — investigate | The plant is regularly run outside its intended sequence — pumps or towers running with no chiller, or a chiller running without full flow or heat rejection; a sequence-logic review is due. |
Reference bands only. The six sequences and their weights are the chilled-water-plant reference pattern; confirm the interlock map and criticality per plant before activating compliance reporting, because plant topology (number of chillers, dedicated vs headered pumps, tower staging) changes which interlocks apply.
The plant-level target is a weighted operational-compliance score of ≥ 95%, with each of the three critical interlocks (chiller to CHW pump, chiller to condenser-water pump, chiller to tower) held at ≥ 95% on its own so a strong distribution score cannot mask an unprotected chiller. Agree the floor per plant before reporting against it.
The table below shows how moving Chiller Plant Operational Compliance impacts each customer value driver the product is designed to improve — the metric page explains the mechanism; the product pages express the magnitude.
| Value driver | Impact strength | How Chiller Plant Operational Compliance moves this lever |
|---|---|---|
| Energy savings | Direct, primary | Every interval a pump or tower fan runs with no chiller behind it is auxiliary energy spent moving water and rejecting heat that is not being produced. Surfacing the off-sequence run-time — especially the system-off-consistency breaches — is the most direct no-capex lever on the plant's auxiliary load. Per-plant magnitude is expected (pending validation) — offices have no named Keedian reference deployment yet. |
| Asset lifespan | Direct | Running a chiller without its full chilled-water flow, condenser-water flow, or heat rejection is exactly the condition the interlocks exist to prevent — it drives the compressor toward low-flow trips, high head pressure, and thermal stress. Catching a chronically failing critical interlock protects the plant's most expensive machine before the exposure becomes damage. |
| Avoided truck rolls | Indirect, leading indicator | A critical interlock that fails repeatedly is a controls or sensor fault developing in the open — a stuck status point, a mis-mapped command, a failing pump starter. Flagging it as a scoped item for the plant vendor turns what would become an unplanned plant trip into a planned sequence-logic visit. |
The table below summarizes the alarms that fire directly from Chiller Plant Operational Compliance. Each row links to the full operational detail (trigger, preconditions, action plan, human role, escalation, prevention) in the SOPs catalog.
| Alarm | Description | Severity | Tier | AI executes? | Value drivers | SOP |
|---|---|---|---|---|---|---|
| Sequence fault — Chiller → CHW (CP) pump | A chiller is proven ON but no chilled-water (CP / primary) pump is proven running — the chiller is producing cooling with no chilled-water flow through its evaporator. The most safety-critical of the plant interlocks: sustained, it risks a low-flow trip or a frozen, physically damaged evaporator. | Urgent | Essential | Hybrid | Asset lifespan · Energy savings · Avoided truck rolls | Open SOP → |
| Sequence fault — Chiller → CW (CC) pump | A chiller is proven ON but no condenser-water (CC) pump is proven running — no condenser flow to carry heat from the condenser out to the tower. Sustained, condensing pressure and temperature climb, the chiller loses efficiency, and it eventually trips on high-pressure protection or shuts down. | Urgent | Essential | Hybrid | Asset lifespan · Energy savings · Avoided truck rolls | Open SOP → |
| Sequence fault — Chiller → cooling tower | A chiller is proven ON but no cooling tower is running — the plant has no path to reject heat to the atmosphere. Sustained, condenser water just recirculates and heats up, driving condensing temperature up and efficiency down until the chiller protects itself. | Urgent | Essential | Hybrid | Asset lifespan · Energy savings · Avoided truck rolls | Open SOP → |
More alarms in development (single-metric): per-sequence trend alerts that flag a critical interlock drifting before it breaches, and a system-off-consistency watch for auxiliaries left running after hours. Composite plant alarms that combine operational compliance with Cooling ΔT and plant efficiency to separate an operating-discipline problem from a mechanical one will appear in a future release.
The action plan for each alarm lives on its own SOP page in the SOPs catalog — with the diagnostic steps, human role, value drivers, escalation, and prevention specific to that alarm. The list below maps each alarm to its SOP.
Operational compliance is read from the BMS interlock states; Keedian does not change the plant's sequence logic. When a sequence is breached, Keedian surfaces the failing interlock, how often it failed, and the equipment pair involved, and hands it to the customer's plant-service vendor with a recommended correction. Do not report a plant as non-compliant on a breach that traces to a stale or mis-mapped status point before the point mapping is confirmed.
The six sequences and their weights are the reference pattern for a chilled-water plant; the actual interlocks depend on plant topology — number of chillers, dedicated versus headered pumps, how towers stage. Confirm the point mapping and which interlocks apply for each plant before activating compliance reporting, so a sequence that does not exist on that plant is not scored as a failure.
A chiller proven ON with no chilled-water flow, no condenser-water flow, or no tower is the exposure the critical interlocks exist to prevent. Escalate it out of cycle to the customer and the plant vendor rather than holding it for the MBR — the risk is a low-flow trip or compressor damage in the moment, not a monthly efficiency reading.
Per-alarm escalation criteria live in the Escalation block of each SOP in the SOPs catalog. The patterns below are metric-level — read from the portfolio view, not from any single alarm firing.