Mechanical Commissioning Lead – Critical Facility Systems
Listed on 2026-10-18
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Engineering
Mechanical Engineer, Test Engineer
The Mechanical Commissioning Lead is responsible for the mechanical commissioning scope from design review through Integrated Systems Testing (IST) and final turnover. This role provides accountability to the Commissioning Authority and Commissioning Manager for mechanical system readiness, testing, documentation, and issue resolution across chilled water, condenser water, heat rejection, air handling, room cooling, ventilation, pressurization, BMS controls, fuel oil, and applicable plumbing and process water systems.
The position directs mechanical commissioning engineers and technicians while coordinating mechanical contractors, controls integrators, TAB firms, and OEM representatives throughout the commissioning lifecycle.
- Lead the mechanical commissioning process from design review and planning through startup, functional performance testing, Integrated Systems Testing, and final turnover.
Review mechanical drawings and specifications at the 30%, 60%, and 90% design stages, including flow diagrams, equipment schedules, sequences of operation, points lists, piping and duct layouts, and control diagrams.
Review mechanical design against the Owner's Project Requirements (OPR) and Basis of Design (BOD), including cooling redundancy, thermal ride-through, concurrent maintainability, design-day capacity, setpoints, and system failure behavior.
Review sequences of operation to identify gaps, conflicts, system integration concerns, and requirements that cannot be effectively tested during commissioning.
Identify commissionability gaps including missing test ports, inadequate system isolation, insufficient metering, and limitations affecting load simulation or redundancy testing.
Develop the mechanical sections of the Commissioning Plan and applicable Division 23 and Division 25 commissioning specifications.
Define commissioning levels, witness requirements, TAB scope, trend-log requirements, and mechanical documentation deliverables.
Establish clear responsibilities between TAB, commissioning, and controls integration activities.
Identify Factory Witness Testing (FWT) requirements for chillers, CRAH/CRAC units, AHUs, pumps, VFDs, cooling towers, dry coolers, and other applicable mechanical equipment.
Develop and maintain the mechanical commissioning schedule, including flushing, system fill, water treatment, TAB, load simulation, and seasonal testing milestones.
Attend or coordinate Factory Witness Testing for major mechanical equipment and verify testing against project design conditions and required part-load operating points.
Witness packaged equipment controls simulation including staging, failure response, alarm mapping, and BMS integration.
Document factory testing nonconformances and track identified issues through resolution or owner acceptance.
Review and witness mechanical completion activities including equipment installation, alignment, vibration isolation, piping supports, valve identification, insulation, labeling, and equipment access.
Verify piping and duct installation against approved drawings, including sizing, valve orientation, strainers, flow direction, expansion provisions, air vents, and drains.
Witness or review pressure testing, flushing, cleaning, system fill, and initial water treatment activities.
Verify BMS installation including sensor locations, calibration, actuator operation, valve and damper functionality, and point-to-point verification.
Confirm VFD parameters, motor rotation, and mechanical safety interlocks prior to startup.
Verify fuel oil system integrity testing and leak detection where included within the project scope.
Establish mechanical system readiness criteria and ensure critical pre-startup requirements are satisfied prior to equipment startup.
Review and approve startup Method of Procedures (MOPs) and coordinate power availability and startup sequencing with the electrical commissioning team.
Witness OEM startup of chillers, pumps, cooling towers, CRAHs, CRACs, AHUs, humidification systems, VFDs, and other mechanical equipment.
Witness and review Testing, Adjusting, and Balancing (TAB) activities for air and water systems and verify results against design requirements.
Verify BMS graphics, alarms, trends, historian functionality, and sequences of operation are operational prior to functional performance testing.
Confirm mechanical setpoints, reset schedules, and deadbands are configured in accordance with approved sequences of operation.
Execute Level 4 functional performance…
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