The Johnson Controls TC-8801-8001 is an electronic room temperature controller used in HVAC systems. It provides dual proportional outputs for modulating heating and cooling devices, making it suitable for four-pipe systems and VAV (Variable Air Volume) applications.

• Function: The TC-8801 series controllers are designed for individual space temperature control in heating and cooling applications.
• Operation: They generate direct and reverse proportional output signals in response to load changes, allowing sequential modulation of two devices (e.g., heating and cooling valves).
• Applications:
  • Four-pipe fan coil systems (separate heating and cooling valves).
  • VAV systems (reheat valve + discharge damper actuator).
• Model TC-8801-8001: A specific variant within the TC-8801 family, often referred to as an HVAC control system board. It has been discontinued by Johnson Controls, but documentation and replacements are still available.

Key Specifications