The main parts of the system to understand are:

  • Heat Exchanger (Economizer)
  • Bypass Duct and Dampers
  • Recirculation Duct and Dampers
  • Temperature Indicating Controllers
  • Electric Heaters
  • Filter Banks
  • Spray Systems
  • Supply and exhaust Fans

Building air make-up and heating consists of two heat exchange units along with with their air distribution ductwork or plenums.
Heat is transferred from the #1 Machine hood exhaust into the supply air when required.