A chiller technician installs, maintains, troubleshoots, and repairs large-scale industrial and commercial chiller systems used for temperature control in buildings and factories. Key responsibilities include diagnosing and resolving issues with refrigeration components like compressors and evaporators, conducting planned maintenance to ensure optimal system performance, and complying with safety and environmental regulations. The role requires strong knowledge of electrical and mechanical systems, the ability to read blueprints, and the physical stamina to work in various environments.