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MHGRV-X Field Technical Guide
APPENDIX A: SAT SENSOR
Supply Air Temperature Sensor Installation
Mounting the Supply Air Temperature
Sensor
The Supply Air Temperature Sensor should be located in the
ductwork 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 inch 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. To help prevent
thermal gradients from affecting the sensor, apply insulation on
the outside of the duct, over the sensor.
WARNING:
Make sure your 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
MHGRV-X. If, in Stand-Alone Mode, the MHGRV-X is used in
conjunction with a Stand-Alone MODGAS-X, the SAT sensor
is shared between the two controllers and always attaches to the
MODGAS-X.
See
Table 9, page 21
for SAT Options Jumper Settings and see
Figure 3, page 8
for wiring.
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 10, page 21
for SAT Options Jumper Settings and see
Figure 2, page 7
for wiring. See
Table 8, page 21
and
Appendix
B, page 22
for details about retrofit applications.
Figure 6: Supply Air Temperature Sensor Installation
Leads are non-polarized. Butt splice leads to 24-gauge wire minimum.
If using a VCCX2 controller, connect leads to “AI3” and “GND” on main controller.
In Stand-Alone and in retrofit applications, connect leads to “SAT” and “GND” on
MHGRV-X controller.
If using a VCM-X, SA, RNE, or VCB-X controller, connect leads to “AI2” and “GND”
on main controller.
