Final answer:
The critical task that the installer must perform is to ensure compatibility between the existing components and the new system.
Step-by-step explanation:
When existing components have to be reused in a system, a critical task that the installer must perform is to ensure compatibility between the components and the new system. This involves verifying that the physical shapes and dimensions of the components align with the system requirements. It also requires understanding whether the components will be acquired from external vendors or fabricated within the company, and if fabricated within the company, the materials and fabrication processes to be used.
In addition, for electrical subsystems, the installer needs to have a detailed schematic diagram in order to properly integrate the components. For example, if the system includes embedded Assembly processes, the installer should also be familiar with the computer code needed to ensure proper functioning.