Auto-Zone Control Systems Auto-Zone Plus Systems Installation & Operation (Version 03A) - Manual (Page 7)

Auto-Zone Plus Section 1
Design Guide 1-3
General Information
The Auto-Zone Plus control system converts single-zone Constant Volume HVAC units
into variable air volume/variable temperature multiple zone systems. The microprocessor
based Zone Manager calculates the heating and cooling requirements for each zone based
on real time information received from each Zone Controller. The Zone Manager then
directs the HVAC unit to provide the appropriate amount of heating, cooling, and
ventilation to satisfy each zone's requirements. A static air pressure sensor located in the
supply duct measures air pressure and the Zone Manager controller sends a signal to
modulate a bypass damper to maintain the static pressure setpoint. The Zone Manager has
been updated with a new feature so that it can instead be configured to provide a 0-10
VDC signal output to control a Variable Frequency Drive (VFD) which in turn varies the
HVAC units supply air fan motor speed to maintain the static pressure setpoint.
Return Duct
Duct to Return
Supply Temp Sensor
Return Temp Sensor
(Ahead of Bypass Takeoff)
( Over Corridor for Easy Service )
(2/3 Of The Way Down Main Duct)
(Direct Airflow Inward Towards Center of Area)
(Avoid Mixed Air Area)
(Mount Away From Direct Sunlight))
(Preferred)
Bypass Damper
( Locate Where Easily Accessible ) Static Pressure Pickup
Supply Duct
Zone Damper and Control
Above Corridor
Diffuser at Perimeter Wall
( Preferred Location )
Zone Sensor
Zone Manager
(4-1/2' to 5'; Shoulder Height)
Outdoor Air Sensor
LOCAL COMM LOOP
TWISTED PAIR
WITH SHIELD TO
ZONE CONTROLLER
NETWORK COMM LOOP
TWISTED PAIR
WITH SHIELD TO
NEXT ZONE MANAGER
LOCAL COMM LOOP
TWISTED PAIR WITH
SHIELD TO OTHER
ZONE CONTROLLERS
OR CV CONTROLLERS
LOCAL COMM LOOP
TWISTED PAIR
WITH SHIELD TO
ZONE CONTROLLER
(Packaged or Split System)
Typical HVAC Unit
Figure 1-2: Typical HVAC Unit Installation