Auto-Zone Control Systems Auto-Zone Plus Systems Installation & Operation (Version 03A) - Manual (Page 54)

Section 2
Auto-Zone Plus
2-22 Design Guide
The Zone Controller requires the following electrical connections:
18 Gauge minimum unless otherwise noted.
-24VAC Supply Voltage........................................................................... 2 Conductors
-Communications Loop .................. (18 ga. min.) 2 conductor twisted pair with shield
WattMaster wire, Belden #82760 wire or equivalent
-Room Temperature Sensor..................................... 2 Conductors for standard sensors
3 Conductors for sensors with setpoint adjustment
-Fan Terminal units / Auxiliary Heat.............. 2-4 Conductors see wiring diagrams for
(Optional) Auxilary Relay board
Tip:
After making all electrical connections, it is suggested that all terminal blocks on
the Zone Controller be unplugged until you are ready to begin the checkout
procedure. This may help prevent damage if wiring errors occur elsewhere in the
system during installation or start-up. This is particularly important with the
Zone Controllers since an error on one unit may prevent any of the others from
working until the problem is found and corrected.
Warning:
Polarity is very important when connecting power to the controllers!
The grounded side of the control transformer must be connected to the
terminal labeled GND on the Zone Controller. If a single transformer
is used to power more than one Zone Controller you must connect
GND-to-GND and 24VAC-to-24VAC on each zone controller.
Failure to observe polarity will result in damage to one or more
components in your system.