Can unlicensed persons perform maintenance, service, and repairs on a process cooling and heating system?
Yes. Once the primary (closed loop) process system has been deactivated and rendered inert by a licensee, an unlicensed person may perform maintenance, service and repairs on the secondary (open loop) components which include the piping, heat exchangers, vessels, cooling towers, sump pumps, motors, and fans. See Administrative Rule 75.100(d)(2).