Zonex Systems DIGI3 is an economical auto
  changeover 2 or 3 zone controller, perfect for
  Residential New Construction or smaller
  zoning systems.

  The DIGI3 is a universal controller that is field
                          configurable for
      Gas/Electric or Heat Pump applications.

  The DIGI3 provides Emergency Heat control
  and an optional Leaving Air Sensor for
  capacity control which protects the coil from
  freezing and the heat exchanger from
  premature failure.

               A complete DIGI3 System
  Consists of the following components:

  1. DIGI3 Universal GE/HP Controller
  2. Capacity Control
  3. Zone Dampers
  4. Barometric Bypass
  5. Zone Thermostats (Field Supplied)
     G/E stats  for G/E application.
     Use Heat Pump thermostat on Zone 1 and
     Gas/Electric Thermostats on Zones 2 and 3
  6. 40 VA Transformer (Field Supplied)