Auto-Zone CV & CV-EX
Section 4
Start-Up and Troubleshooting 4-11
CV Controller Inputs & Outputs
24 VAC Power Connector
This connector provides power to the CV Controller.
24VAC - The “hot” side of the control transformer.
GND - The grounded side of the control transformer. If the secondary of the
control transformer is not grounded, you must still observe polarity if the trans-
former powers any other device!
Warning: Connect only the GND terminal to the grounded side of a transformer.
Failure to properly observe polarity will result in
damage to the system.
Observe polarity at all points in the system.
Analog Input Descriptions
Input #1 - Space temperature is read on this input. If the room sensor with override is
installed, the input is also monitored for push-button override commands. The push-
button is only active during unoccupied hours so a push during occupied hours has no
effect.
Input #2 - This input is only used if a space temperature sensor that has the slide adjust
option is installed. The slide adjust can be used to offset the current heating and cooling
setpoints.
Input #3 - Supply air temperature is read on this input. The supply air reading is used to
detect equipment failure. Once a heating or cooling stage has activated, the supply air has
thirty minutes to change by 5°F or the controller assumes a mechanical failure has
occurred. The supply air also prevents cooling stages from activating if the temperature is
45°F or lower in the cooling mode and heating stages from activating if it is 140°F or
higher in the heating mode.
Input #4 - Outdoor air temperature is read on this input. If you have more than one CV
controller installed on the RS-485 communication loop, only one controller needs this
sensor. The unit that has this sensor will automatically broadcast the outdoor air tem-
perature to all other controllers on the loop.
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