41
MODGAS-XWR2-B Technical Guide
APPENDIX A: SAT SENSOR
Installation
Mounting the Supply Air Temperature Sensor
The Supply Air Temperature (SAT) Sensor should be located in the
duct-work downstream of the unit supply air connection.
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.
WARNING:
Ensure the Supply Air Temperature Sensor
is mounted and wired according to these
instructions prior to testing the unit or else
the modulating valve will not control properly
and may damage your equipment.
Stand-Alone Mode
In Stand-Alone Mode, the SAT Sensor is connected to the
MODGAS-XWR2-B. If, in Stand-Alone Mode, the MODGAS-
XWR2-B is used in conjunction with a Stand-Alone MHGRV-X
series module, the SAT sensor is shared between the two modules
and always attaches to the MODGAS-XWR2-B.
See
Table 10, page 42
for SAT Options Jumper Settings and
reference the appropriate figure for wiring. See
Table 9, page 42
for details about retrofit applications.
Communication Mode
When communicating with AAON unit controllers, the
SAT Sensor will be connected to the AAON unit controller.
The exception would be in retrofit applications with older
controllers. See
Table 11, page 42
for SAT Options Jumper
Settings and see the appropriate figure
for wiring. See
Table 9,
page 42
for details about retrofit applications.
NOTES:
1. Leads are non-polarized. Butt splice leads to 24-gauge wire minimum.
2. In Stand-Alone and retrofit applications, connect leads to
“SAT and “GND”
on MODGAS-XWR2-B.
3. If using a VCCX2 Controlle
r,
connect leads to “AI3 and “GND” on
main controller.
Duct Work
Drill 5/16” hole for probe
Adhesive backed drill guide mounting template
Gasket
Mounting Plate
1/4” hex head sheet metal screws
Thread
Together
5-1/2” or 11-1/2”
depending on model
number
3/4”
4.0”
Figure 17: Supply Air Temperature Sensor Installation
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