Auto-Zone Control Systems Auto-Zone Plus Systems Installation & Operation (Version 03A) - Manual (Page 154)

Section 4 Auto-Zone Plus
4-4 Start-Up and Troubleshooting
1.2 Auto-Zone - Plus System
The Auto-Zone - Plus system has more than one communications loop so it is important
to remember that each loop must have its own master.
The main communications loop is the Network loop. It connects all of the Zone Managers
(with MiniLinks) to the CommLink IV. Each Zone Manager also has its own Local loop
which connects it to the Zone Controllers and any CV Controllers or System Managers
which you have chosen to be connected to this particular loop. Study the loop wiring
diagrams until you understand this arrangement.
The CommLink IV is always the master on the Network loop. You must be sure the
CommLink IV is connected and functioning if you are troubleshooting the Network loop.
The MiniLink (mounted on the Zone Manager) is always the master on the Local loop.
The MiniLink will pass tokens to the Zone Manager and any Zone Controllers, CV
Controllers, or System Manager found on the Local loop.
The MiniLink continues to “pass the token” even if the Network loop is not functioning.
This is important to remember since the Zone Manager and the Zone Controllers will
continue to communicate even if the Network loop is damaged. This feature allows each
rooftop unit with a Zone Manager and its associated Zone Controllers to function
independently in the event of a “fault” on another part of the system.