DIGI4 is an economical auto changeover
  2 - 4 zone single or two stage controller,
  perfect for residential applications or smaller
  commercial zoning systems.

                  The DIGI4 is available for
                     Gas/Electric 2H, 2C or
             Heat Pump applications 3H, 2C.

  The DIGI4 includes a fully adjustable Leaving Air
  Sensor for capacity control which protects the
  coil from freezing and the heat exchanger from
  premature failure. The Heat Pump Controller
  includes an integrated Fossil Fuel control
  requiring no additional relays or wiring.

      A complete DIGI4 System consists of
              The following components:

  1. GE or HP Controller
     Capacity Control (Included)
  2. Zone Dampers
  3. Barometric Bypass
  4. Zone Thermostats (Field Supplied)
  5. 40 VA Transformer (Field Supplied)