An AI data-center commissioning checklist must prove more than that each component starts. It must show that utility power, UPS and generators, cooling (including liquid loops where used), networks, controls, telemetry and GPU workloads operate together at the required capacity, in degraded modes and during failures. Use a staged process: define the Owner’s Project Requirements (OPR), review the design, collect factory and startup evidence, complete Level 3 (L3) pre-functional checks, run Level 4 (L4) functional tests, then execute Level 5 (L5) integrated systems tests with representative and volatile accelerator loads. Keep measured data, deficiencies and retest evidence as the basis for owner acceptance and future re-commissioning.
What commissioning must prove in an AI facility
AI halls can change electrical and thermal conditions quickly as accelerator jobs start, stop or shift between nodes. A successful commissioning program therefore tests capacity, control response, resilience, observability and operator actions as one system. It also leaves a defensible record: approved requirements, reviewed drawings, calibrated instruments, test procedures, raw time-series data, issue logs, training records and signed acceptance.
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ASHRAE Standard 202-2018 and Guideline 0-2019 define the critical-facility commissioning framework: documented roles, design reviews, procedures, reports and training. ASHRAE notes that “AI data centers are deploying new technology at a rate never before seen in the industry.” That pace makes a written baseline and repeatable test scripts more important than informal demonstrations.
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Start with a requirements register that the owner, design team, commissioning authority (CxA), facilities operator and IT representative approve. Every later test should trace to an item in this register.
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- Capacity assumptions: utility service, UPS and generator ratings; rack and row densities; expected GPU or accelerator count; network bandwidth; cooling-water temperatures, flow and heat-rejection capacity; and the growth or phasing plan.
- Resilience targets: the power paths, cooling paths, network paths and control components that must survive a single failure, maintenance event or other specified contingency.
- Maintainability: isolation points, bypasses, service clearances, replacement procedures, spare capacity and the maximum maintenance window the operations team can support.
- Constraints and compliance: the authority having jurisdiction (AHJ), utility interconnection rules, adopted electrical and fire codes, cybersecurity boundaries, water-quality requirements and environmental limits.
- Acceptance criteria: allowable voltage and frequency excursions, transfer times, temperature and humidity bands, flow and pressure limits, alarm priorities, data-retention periods and the conditions under which a test passes.
Record the basis of design, one-line diagrams, sequence-of-operations documents and resilience assumptions under revision control. If a requirement is not measurable, rewrite it before field testing; “high availability” is not a test criterion until the permitted interruption, recovery behavior and affected loads are specified.
Design and document review before equipment testing
The CxA should review coordinated design information before factory or site tests are scheduled. The review should cover:
- Electrical one-lines, short-circuit and protection-coordination studies, arc-flash information, grounding and bonding, harmonics and power-quality assumptions.
- UPS operating modes, battery systems, generator start and loading sequences, automatic-transfer logic, bypass arrangements and interactions between primary and backup sources.
- Mechanical schematics for chilled-water, direct-to-chip or other liquid-cooling systems, including distribution units, pumps, manifolds, quick-disconnects, heat exchangers, expansion control and leak detection.
- Network and control diagrams showing management networks, out-of-band access, addressing and naming, time synchronization, BMS/DCIM interfaces, alarm routes and cybersecurity zones.
- Sensor lists, calibration points, control-loop narratives, alarm matrices, historian tags and measurement-and-verification (M&V) points.
- Integrated test scripts that identify the initiating event, expected automatic response, operator action, stable end state, data to capture and reset procedure.
Resolve drawing conflicts and unapproved substitutions before functional testing. A test report is not evidence that a system passed if the procedure, instrument calibration or acceptance limit was never reviewed.
Factory, installation and startup evidence
Establish hold points so that incomplete documentation cannot be hidden by a “testing complete” notice. Collect and review:
- Factory acceptance test (FAT) records for switchgear, UPS modules, batteries, generators, cooling equipment, control panels, network equipment and liquid-cooling distribution units.
- Installation inspections, torque records, cable and fiber test results, pressure tests, flushing and water-quality reports, labeling checks and equipment access clearances.
- Manufacturer startup sheets, firmware and software versions, protective-device settings, valve and sensor calibration certificates, and generator or battery commissioning results.
- An open-issue log with owner, severity, due date, temporary mitigation and retest requirement. Distinguish design changes from punch-list work so the approved sequence remains traceable.
Do not advance to L4 until safety prerequisites, energization permits, temporary monitoring, emergency communications and rollback plans are documented.
Power-system commissioning checklist
Source, distribution and protection
- Verify utility-interconnection assumptions against the installed service, metering and protection scheme.
- Inspect switchgear lineup, bus sections, breakers, interlocks, controls, grounding and labeling. Confirm settings match the approved protection-coordination study.
- Check UPS rectifier, inverter, static bypass, maintenance bypass, battery strings, battery-monitoring systems and operating modes.
- Verify generator fuel, starting batteries, jacket-water or other ancillary systems, paralleling controls, load-bank provisions and exhaust or ventilation interlocks.
- Confirm automatic-transfer devices sense the intended source conditions and return to normal without nuisance transfers.
Power quality and ride-through
Measure voltage, frequency, phase balance, harmonic distortion, transients and power factor at normal and disturbed conditions. IEEE P4200 describes proposed requirements for interconnection functionality, protection, interoperability, ride-through, power quality, monitoring and study models; because it is a proposed project, confirm its status and any contractually applicable edition before relying on it.
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Test at low, partial and design-rated loads. Use representative accelerator profiles rather than a constant resistive load alone: ramping, synchronized starts, job termination and node recovery can produce different electrical behavior. Record the minimum voltage and frequency, duration of excursions, UPS response, generator response, alarms and the load that remained online.
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- Simulate loss of the preferred utility source and verify UPS continuity, generator start, transfer and stable loading.
- Open or isolate each planned distribution element according to the approved sequence; confirm only the intended loads are affected.
- Test UPS module, battery-string, generator or transfer-device failure where the design claims redundancy.
- Restore the normal source and verify retransfer, battery recharge, generator cooldown and alarm clearance without an unsafe transient.
- Capture event logs from protective relays, UPS, generators, BMS/DCIM and the operations console, then reconcile timestamps using the common time source.
ASHRAE’s listed resources include NETA ATS-2025, NFPA 70-2026 and NFPA 855-2026. Those editions may not be adopted in every jurisdiction, so the AHJ and contract documents govern the required field tests.
Cooling and thermal validation
Conventional and hybrid cooling
Demonstrate that chillers or other heat-rejection equipment, pumps, valves, air handlers and controls deliver the design flow and temperatures at the intended ambient conditions. Check supply and return temperatures, differential pressure, humidity control, airflow, filtration, standby equipment and alarm priorities. Compare measured capacity and stability with the OPR rather than with a generic efficiency target.
Liquid-cooling distribution
Where direct-to-chip or other liquid cooling is installed, include the distribution or coolant-distribution units (CDUs), manifolds, hoses, quick-disconnects, heat exchangers, expansion vessels, pumps, strainers and leak-detection sensors in the same test plan. Verify fluid compatibility, cleanliness, conductivity or other specified water-quality limits, automatic isolation and safe drain or containment arrangements. Check that CDU controls exchange the correct set points and alarms with the facility control system.
Thermal stress and degraded modes
- Stabilize the plant at minimum, typical and design AI loads, recording temperatures, flow, pressure, humidity and valve positions at one-minute or otherwise specified intervals.
- Apply volatile GPU profiles, including rapid ramp-up, sustained peak and coordinated shutdown. Confirm that control loops remain stable and that no sensor, pump or valve saturates.
- Remove a chiller, pump, air handler, CDU or cooling circuit designated as redundant. Verify automatic capacity adjustment, alarm routing and the time available for operator intervention.
- Test loss of flow, high temperature, leak detection and communication failure using safe, controlled methods. Confirm interlocks protect equipment and that compute workloads receive the documented response.
- After each test, inspect for leaks, trapped air, abnormal vibration, fouling indicators and unacknowledged alarms before returning to normal operation.
Networking, controls and telemetry
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- Verify management-network segmentation, addressing, naming, routing, firewall rules, out-of-band console access and approved remote-access methods.
- Synchronize clocks across protection relays, UPS, generators, PLCs, BMS/DCIM, network devices and GPU-management tools. Unsynchronized event logs make integrated-cause analysis unreliable.
- Calibrate temperature, humidity, pressure, flow, electrical and leak sensors. Test sensor failure, stale data, range errors and loss of communications.
- Confirm alarm priorities, escalation paths, acknowledgements, suppression rules and delivery to the staffed operations channel.
- Check historian retention, sampling intervals, tag names, data export and access permissions. ITU-T L.1301 defines a minimum data set and communication interface spanning AC/DC power, UPS, energy distribution, cooling and ICT equipment.
- Validate cybersecurity boundaries, least-privilege accounts, certificate or key handling, backup configuration and recovery of control servers without bypassing safety interlocks.
How L3, L4 and L5 tests establish readiness
| Level | Purpose | Typical evidence | Pass condition |
|---|---|---|---|
| L3: pre-functional | Confirm installation, labeling, safety, calibration and documentation before energizing integrated sequences. | Checklists, inspections, torque and pressure records, calibration certificates, startup sheets, approved procedures and closed prerequisites. | Every component is safe and ready for functional operation; exceptions are logged with an approved mitigation. |
| L4: functional performance | Test each system and its automatic sequences under normal, standby and specified abnormal conditions. | Witnessed scripts for switchgear, UPS, generators, cooling equipment, CDUs, controls, alarms and networks; time-stamped measurements and trend plots. | Each system reaches its stated set points, limits, transfer behavior and alarm response without unplanned consequences. |
| L5: integrated systems | Prove that electrical, thermal, controls, network and compute systems respond together to real-world and failure scenarios. | End-to-end scenarios with facilities and IT operators present, accelerator-load telemetry, event logs, operator actions, recovery times and retest records. | The facility maintains the OPR-defined service and safe state through the scenario, and operators can execute the approved response. |
L3 is not a paper exercise: missing calibration or an unresolved installation defect invalidates later results. L4 should establish each system’s behavior before L5 introduces cross-system dependencies. At L5, coordinate one script and one clock: a power event may change cooling controls, network paths, GPU workload placement and alarm traffic at the same moment.
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Integrated AI workload scenarios
Use load profiles supplied by the compute and operations teams, with the facility team present. Include:
- Cold start of a rack or cluster, synchronized accelerator initialization and normal job ramp-up.
- Rapid power and heat changes when many GPUs begin or end work together.
- Long-duration design load to expose thermal drift, pump cavitation, battery heating or historian gaps.
- Node, rack, network-path, cooling-loop, UPS-module and generator contingencies that the design claims to tolerate.
- Graceful workload drain, checkpoint or restart behavior, followed by restoration and verification of alarms and data integrity.
Define in advance which compute errors are acceptable, which require workload evacuation and which constitute a facility failure. Capture accelerator power, inlet and outlet temperatures, fan or liquid-flow data, job state, network latency or packet loss where relevant, and the facility events on a shared timeline.
Controls, M&V and operating baselines
Execute the M&V plan during commissioning, not after handover. Retain raw time-series data for power, cooling, temperatures, flow, humidity, pressures, alarms and operating modes. Establish normal baselines at agreed ambient conditions and representative AI loads, documenting sensor accuracy and sampling intervals. Re-baseline after major capacity additions, control-sequence changes, firmware upgrades or load-density changes.
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Include operators in L4 and L5 so the test proves human response as well as automation. Walk through normal operating procedures (MOPs), standard operating procedures (SOPs), emergency operating procedures and escalation contacts. Train staff on the deployed BMS/DCIM, UPS and generator interfaces, liquid-cooling controls, alarm acknowledgement, cybersecurity practices, backup restoration and safe isolation.
Handover should include approved as-builts, sequences, network and control diagrams, final settings, FAT and site-test reports, trend data, issue and retest logs, warranties, spare-parts lists, calibration certificates, software and firmware inventories, and maintenance schedules. Obtain written owner acceptance only after deficiencies are closed or formally accepted with risk, owner, due date and compensating control.
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Closeout and continuous commissioning
Keep the commissioning record under change control. Schedule re-commissioning after a major GPU expansion, cooling or power upgrade, control-logic change, network redesign, firmware change or material increase in rack density. Re-run the affected L4 tests and the L5 scenarios that depend on them; do not assume an unchanged result because a component was not replaced.
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Standards and reference framework
| Reference | Use in the checklist |
|---|---|
| ASHRAE Standard 202-2018 and Guideline 0-2019 | Commissioning process, roles, design documents, procedures, reports and training for critical facilities. |
| ASHRAE AI Data Center Energy Performance Framework | Planning, integrated design, energy and thermal efficiency, grid interaction, resilience, commissioning, operations, retrofit and tools. |
| TIA-942 and BICSI 002/009 | Telecommunications cabling and pathways, data-center implementation, commissioning, operations and maintenance references. |
| ITU-T L.1301 | Energy-management data and communications interfaces across power, cooling and ICT equipment. |
| IEEE P4200 | Proposed interconnection, performance, interoperability, protection, ride-through, power-quality and monitoring requirements; verify project status. |
| ASHRAE listed resources: 90.4-2025, NFPA 70-2026, NFPA 855-2026 and NETA ATS-2025 | Potential energy, electrical, battery and acceptance-testing references; confirm local adoption and the edition in force before procurement or testing. |
Standards, proposed projects, equipment capabilities and vendor programs change. The AHJ’s adopted electrical and fire codes, utility requirements and the contract documents control the field test, even when a newer edition is available elsewhere.
Common commissioning failures and corrective actions
- Testing starts with incomplete drawings: freeze a coordinated design set and approve sequences before scheduling witnesses.
- Constant load masks AI transients: add ramp, synchronized-start, abort and restart profiles at partial and design-rated load.
- Alarms exist but do not reach operators: test every route, priority, acknowledgement and escalation with communications staff present.
- Data cannot be correlated: synchronize clocks, standardize tag names and retain raw historian and device logs.
- Liquid loops pass pressure tests but fail in operation: verify cleanliness, water quality, flow balance, CDU controls, leak response and degraded operation under heat load.
- Redundancy is assumed rather than demonstrated: remove the designated component under a controlled script and verify capacity, controls and operator workload.
- Open issues disappear at handover: require severity, owner, mitigation and retest evidence for every deficiency.
Frequently Asked Questions
Who should own the integrated L5 script?
The commissioning authority should coordinate it, but the owner, facilities operator, electrical and mechanical teams, controls specialists, network team and compute owner must approve the scenario, acceptance limits and recovery actions before the witness test.
Can a resistive load bank replace an AI workload test?
No. A load bank can validate portions of electrical capacity, but it does not reproduce accelerator ramp rates, synchronized starts, workload evacuation, network behavior or the thermal-control response of the deployed compute.
When should a facility be re-commissioned?
Re-commission after major additions, control-sequence or firmware changes, network redesigns, cooling or power modifications, or a material increase in rack or GPU density. Repeat the affected L4 tests and dependent L5 scenarios.
What makes a commissioning result auditable?
An auditable result ties an approved requirement to a reviewed procedure, calibrated instrument, identified load and ambient condition, synchronized time-stamped data, witness sign-off, deviations and documented retest or owner-approved risk acceptance.
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