Orion System MHGRV-X - Manual (Page 4)

WIRING
MHGRV-X Field Technical Guide 4
General Wiring Information
Depending on if the MHGRV-X Controller is to be connected to
the HVAC controller or is to be used as a stand-alone controller
determines how the MHGRV-X should be wired. For the wiring
diagram to use when the MHGRV-X Controller is connected to an
AAON Unit Controller, see Figure 2, page 5. For the stand-alone
wiring diagram, see Figure 3, page 6.
For Reheat Expansion Module wiring, see Figure 9, page 22.
Please carefully read and apply the following information when
wiring the MHGRV-X controller and its expansion board(s):
1. 18 gauge minimum wire unless otherwise noted.
2. 24 VAC power connection with an appropriate VA rating.
3. Supply Air Temperature Sensor and Heat 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 specifi cations.
6. Check all wiring leads at the terminal block for tightness.
Be sure that wire strands do not stick out and touch
adjacent terminals. Confi rm that all transducers required for
your system are mounted in the appropriate location and
wired into the correct terminals.
Installation & Wiring
Installation & Mounting
The MHGRV-X Controller is housed in a plastic enclosure. It
is designed to be mounted by using the 3 mounting holes in the
enclosure base. It is important to mount 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 when
mounting the module.
NOTE: The MHGRV-X Controller contains no user-serviceable
parts. Contact qualifi ed technical personnel if your Con-
troller or Module is not operating correctly.