Auto-Zone Control Systems Auto-Zone CV & CV-EX Systems Installation & Operation (Version 01C) - Manual (Page 22)

Section 2
Auto-Zone CV & CV-EX
2-10 Installation and Wiring
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 CV Controller. If a single transformer is used to power more
than one CV Controller, you must connect GND-to-GND and 24VAC-to-24VAC on
each CV controller. Failure to observe polarity will result in damage to one or more
components in your system.
Warning: Use extreme care not to damage any of the electronic components
while mounting the backplate. Mark the holes and then remove the CV Controller
from the backplate before drilling.
Do not allow metal shavings to fall onto the circuit boards.
The Constant Volume Controller requires the following electrical connections:
18-Gauge minimum unless otherwise noted.
-24 VAC Supply Voltage.......................................................................... 2 Conductors
-Communications Loop ...................................... 2 Conductor twisted pair with shield
(Belden #82760 or equivalent)
-Supply Air Temperature Sensor ........................................ (24 ga. Min.) 2 Conductors
-Room Air Temperature Sensor...........(24 ga. Min.) 2 Conductors for standard sensor
3 Conductors for sensors with setpoint adjustment
-Outside Air Temperature Sensor ....................................... (24 ga. Min.) 2 Conductors
-HVAC Unit Control Wiring.....................................................................R - Common
G - Fan
Heat/Cool Stage 1
Heat/Cool Stage 2
Heat/Cool Stage 3
Heat/Cool Stage 4
Tip: After making all electrical connections, we recommend that you unplug all
terminal blocks on the CV Controller until you are ready to begin the checkout
procedure. This may help to prevent damage if wiring errors occur elsewhere in
the system during installation or start-up.