Auto-Zone Control Systems Auto-Zone Plus Systems Installation & Operation (Version 03A) - Manual (Page 197)

Auto-Zone Plus Section 4
Start-Up and Troubleshooting 4-47
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 programmable to cover
all types of proportional actuators. 0 - 10 VDC or 2 - 10 VDC outputs are possible.