Auto-Zone Control Systems Auto-Zone Plus Systems Installation & Operation (Version 03A) - Manual (Page 72)

Section 2
Auto-Zone Plus
2-40 Design Guide
Supply Air Temperature Sensor
The supply air temperature sensor should be located as close to the rooftop unit
discharge as possible for best response. It should also be mounted upstream of the bypass
damper for best results. Locate the sensor in the center of the widest part of the duct. Use
the supplied template and a 5/16" drill to make a hole for the sensor. Install the gasket
over the probe and mount securely to the duct using the supplied sheet metal screws. Be
sure the gasket is compressed to provide an air tight seal. For best accuracy, apply
insulation on the outside of the duct, over the sensor. This will help prevent thermal
gradients from affecting the sensor.
Figure 2-29:
Supply or Return Air Sensor Installation
Return Air Temperature Sensor
The return air temperature sensor should be located as close to the rooftop unit return
air intake as possible. Avoid locations which will be exposed to extreme outside
temperatures. Locate the sensor in the center of the widest part of the duct. Use the
supplied template and a 5/16" drill to make a hole for the sensor. Install the gasket over
the probe and mount securely to the duct using the supplied sheet metal screws. Be sure
the gasket is compressed to provide an air tight seal. For best accuracy, apply insulation
on the outside of the duct, over the sensor. This will help prevent thermal gradients from
affecting the sensor.
Caution: Do not mount the return air sensor in the mixed air section. This will
cause an error in the reading.
Mounting Plate
Gasket
Adhesive Backed Drill Guide
Mounting Template
11-1/2" (OE231)
5-1/2" (OE230) Mounting Plate
4.0"
3/4"
1/4" Hex Head Sheet Metal Screws
Thread
Together
Duct Work
Drill 5/16" Hole In Ductwork For Probe
Leads Are Non-polarized.
Butt Splice Leads To 24 Gauge
Wire Minimum. Connect Leads
To "Analog In" And "Ground"
At Controller.