Auto-Zone Control Systems Auto-Zone Basic Systems Installation & Operation (Version 02C) - Manual (Page 9)

Auto-Zone Basic Section 1
Design Guide 1-3
General Information
The primary application of the Auto-Zone Basic Control System is to provide multiple
controlled comfort zones from a single zone, unitary heating and air-conditioning
package unit. It can also be applied to existing installations for improved comfort to
multiple zones currently controlled by a single thermostat.
Description of System Components
A typical Auto-Zone Basic Control System is comprised of the following four basic
components.
Zone Manager
The Zone Manager is a microprocessor-based controller which monitors up to 16 zones
in the system. The zone manager then controls the HVAC unit to satisfy the requirements
of each individual zone while maintaining efficient operation and comfort. The zone
manager is also responsible for controlling duct static pressure.
In the Auto-Zone Basic version, the Zone Manager has a display and a keypad. The 4-
line by 20-character display is backlighted, making it easier to read in low light
environments.
Bypass Damper
The bypass damper controls proper duct static pressure to insure proper airflow. The
damper is modulated by the Zone Manager based on a signal received from the static
pressure sensor connected to the main duct.
Zone Controller
The Zone Controller monitors space temperature and allocates proper airflow to the
assigned zone to achieve desired comfort and ventilation levels. If supply air temperature
will benefit the local zone temperature setpoint, the zone damper modulates to reduce or
increase airflow as needed. If supply air will not benefit the local zone, the controller will
direct the damper actuator to a minimum position and wait for a change in supply air
temperature.