29MHGRVX-B2 Module Technical Guide
APPENDIX C: REHEAT EXPANSION MODULE
Installation and Wiring
Installation and Mounting
The Reheat Expansion Module is provided with a Chevron cut
plastic snap track mounting base. The snap track is designed to be
mounted using a ¼” Hex Head Sheet Metal Screw (provided) to a
at surface using the pre-punched mounting hole that is provided
in the center of the snap track. The Reheat Expansion Module is
then snapped into place on the snap track, providing for easy eld
mounting and servicing.
The Reheat Expansion Module needs to be installed in an
environment which can maintain a temperature range between -22°F
and 158°F not to exceed 95% RH levels (non-condensing). It is
important to keep the module in a location that is free from extreme
high or low temperatures, moisture, dust, and dirt. Be careful not to
damage the electronic components.
NOTE: The Reheat Expansion Module contains no user-
serviceable parts. Contact qualified technical
personnel if your controller or module is not operating
correctly.
General Wiring Information
For the wiring diagram to use when the MHGRVX-B2 is connected
to an AAON unit controller, see Figure 2, page 7. For the Stand-
Alone wiring diagram, see Figure 3, page 8.
For Reheat Expansion Board wiring, see Figure 8, page 30.
Please carefully read and apply the following information when
wiring the Reheat Expansion Module(s):
1. 18-gauge minimum wire unless otherwise noted.
2. 24 VAC power connection with an appropriate VA rating.
3. Compressor Enable must have 24-gauge minimum wire.
4. All 24 VAC wiring must be connected so that all ground
wires remain common. Failure to follow this procedure
can result in damage to the module and connected
devices.
5. All wiring is to be in accordance with local and national
electrical codes and specications.
6. Check all wiring leads at the terminal block for tightness.
Be sure that wire strands do not stick out and touch
adjacent terminals. Conrm that all transducers required
for your system are mounted in the appropriate location
and wired into the correct terminals.
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