Mechanical ​/ Cooling Engineer (HVAC)

The Mechanical / Cooling Engineer will take ownership of the data centre's critical cooling infrastructure, ensuring reliable and efficient thermal management for high-density GPU and IT loads.

The role will oversee the operation and maintenance of the free-cooling system, heat exchangers, pumps, glycol and water loops, rear-door heat exchangers (RDHx), liquid-to-chip cooling manifolds and backup chillers. The engineer will monitor system performance, optimise cooling efficiency and ensure the facility maintains the required environmental conditions and resilience.

The role will also work closely with Scottish Water Horizons, contractors and the wider facilities team to manage the water interface, treatment requirements and ongoing operation of the cooling systems.

• - Take ownership of the site's mechanical and cooling infrastructure, ensuring safe, reliable and efficient operation.
• - Operate and maintain free-cooling systems, heat exchangers, pumps, glycol loops, RDHx and backup chillers.
• - Maintain and support liquid-to-chip cooling systems and manifolds serving high-density GPU infrastructure.
• - Monitor cooling performance, temperatures, pressures, flow rates and system alarms.
• - Monitor PUE and cooling efficiency, identifying opportunities to optimise energy consumption and system performance.
• - Optimise the use of the free-cooling loop to maximise efficiency and minimise reliance on mechanical cooling.
• - Carry out planned preventative maintenance (PPM), inspections, testing and reactive repairs.
• - Diagnose and respond to cooling system faults, leaks, temperature excursions and equipment failures.
• - Monitor and maintain water quality, glycol concentration and water treatment systems.
• - Manage the site's wet-well and water interface, ensuring appropriate operation and maintenance.
• - Liaise with Scottish Water Horizons regarding water supply, cooling requirements, operational issues and planned works.
• - Manage and coordinate specialist mechanical, HVAC and refrigeration contractors.
• - Support the commissioning, testing and handover of new cooling infrastructure.
• - Review method statements, risk assessments and permits associated with mechanical and cooling works.
• - Maintain accurate maintenance records, asset registers, operating procedures and technical documentation.
• - Support incident investigations and root-cause analysis following cooling failures or operational issues.
• - Ensure all cooling equipment is operated and maintained in accordance with manufacturer requirements, statutory obligations and site procedures.
• - Support the wider Critical Facilities team during major incidents, maintenance activities and emergency situations.
• - Participate in an on-call rota for critical cooling incidents.
• - Identify opportunities to improve cooling resilience, efficiency, capacity and reliability.