Isembard Pellingham-Agyekum

Service and maintain 22 supermarket sites (parallel compressor racks, condensers, 400+ display cases) for two regional grocery chains, averaging 14 calls/week with 98% first-visit fix rate. Led 6 R-404A to R-448A retrofits and one 120 kW CO2 transcritical booster install, cutting annual refrigerant purchases by $86K. Built a quarterly leak-detection route with ultrasonic and electronic detectors, reducing chain-wide leak rate from 21% to 13% and keeping all sites under EPA AIM Act thresholds. Commission and tune Danfoss and Emerson E2/E3 controllers; trimmed rack energy use 11% via floating head pressure and defrost scheduling. Mentor 3 apprentices on brazing, evacuation, and recovery; zero recordable injuries in 5 years.

Installed and repaired walk-in coolers/freezers, ice machines, and reach-ins for 60+ restaurants, fish processors, and convenience stores. Rebuilt semi-hermetic Copeland and Bitzer compressors, saving customers avg. $4,200 per job versus replacement. Ran emergency on-call rotation through -30°F winters, restoring blast freezers at seafood plants within a 4-hour SLA. Maintained refrigerant tracking logs for 100% EPA Section 608 audit compliance.

Assisted journeymen on rooftop units, split systems, and walk-in installs; brazed 1,000+ joints with zero callback leaks. Performed PM checklists on 40 commercial accounts; documented findings in ServiceTitan. Earned EPA 608 Universal and OSHA 10 during the first year.

Coursework in commercial refrigeration, HVAC controls, electrical theory, and brazing; completed 1,200+ lab and shop hours.

2024 Regional Tech of the Year, Northern Lights Mechanical — recognized for 98% first-visit fix rate and leak-reduction program. Designed a winter-proof condenser hood retrofit adopted at 9 sites, preventing snow-load and ice-related condenser failures.