Section 1
Auto-Zone Plus
1-4 Design Guide
CommLink II
The CommLink II communications interface allows user access to any controller.
Locally, access is by means of an on-site computer. Remote access is obtained via
modem. The CommLink II may also be configured for Call-Out on Alarm. The
CommLink II comes packaged in an attractive plastic enclosure and is powered by a
small wall mounted transformer. The CommLink II should be located near the computer
which will be used to monitor the system. If no on-site computer is to be used then locate
the CommLink II near the phone line jack if a modem is to be used. The cables from the
CommLink II-to-modem and the CommLink II-to-computer should not exceed twenty-
five feet.
Zone Manager
The Zone Manager is a microprocessor based controller which monitors up to sixteen
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 operates the fan, heating, cooling, duct static pressure, and
economizer functions. Each Zone Manager also features time scheduling, night set back,
trend logging of sensor values, and automatic changeover.
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.
Constant Volume Controller
The Constant Volume (CV) Controller is a microprocessor based controller designed to
operate packaged roof top HVAC units. Up to thirteen stand alone CV controllers can be
connected to each Zone Manager's local communications loop to provide a fully
integrated multizone/single-zone control system. The CV controller operates the fan,
heating, cooling, and economizer functions. Each CV controller also features time
scheduling, night set back, trend logging of sensor values, and automatic changeover.
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