Section 4 Auto-Zone Plus
4-48 Start-Up and Troubleshooting
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.
4.2.2 Analog Input Descriptions
Input #1 - Space temperature is read on this input. If the room sensor with override
(OE211) sensor 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 - If the OE212 or OE213 space temperature sensor is installed, the sensor
contains a slide adjust control for varying the current heating and cooling setpoints. If the
OE210 or OE211 sensors are used, this input will not be used.
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
30 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
CVAHU 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 temperature to all other controllers on the loop.
Input #5 - This input can be used to monitor a dirty filter alarm contact closure. If the
contact is closed, the alarm is active.
Note: All temperature sensors must be Thermister Type III which provide 77°F @
10K Ohms Resistance.
4.2.3 Analog Output Description
Analog Output - This output is used to control the Outdoor Air Damper if you
configure the unit for Economizer control. The output voltage range is user
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