24
MHGRV-X Field Technical Guide
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 flat 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 field 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 contain 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 MHGRV-X 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 9, page 25
.
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 specifications.
6. Check all wiring leads at the terminal block for
tightness. Be sure that wire strands do not stick
out and touch adjacent terminals. Confirm that all
transducers required for your system are mounted in
the appropriate location and wired into the correct
terminals.
APPENDIX C: REHEAT EXPANSION MODULE
Installation and Wiring
