MHGRV-X Field Technical Guide
OVERVIEW
3
Overview
The V12100 MHGRV-X Controller is designed to control a Modulat-
ing Hot Gas Reheat Valve to maintain a desired Supply Air Tempera-
ture setpoint. The controller can be used as a stand-alone controller
or can be used in conjunction with any AAON unit controller.
In addition, up to (7) Reheat Expansion Modules can be connected to
the Controller and to each other for additional Reheat Valve Control.
The MHGRV-X controller connects to an AAON unit controller or
expansion module via a modular cable. Depending on the type of
unit controller, this connection will utilize an I
2
C connection or an
E-BUS connection.
When using the MHGRV-X Controller to replace an existing
MHGRV II Controller, see
Appendix B
,
page 20
for details.
See
Figure 1
for dimensions (in inches).
MHGRV-X Controller General Information
Figure 1: V12100 MHGRV-X Controller Dimensions
Features
The MHGRV-X provides the following:
Can be operated as a stand-alone controller or
communicating with AAON unit controllers.
Provides for Supply Air Temperature Setpoint
reset when required
Second stage reheat capability when using
2 Hot Gas Reheat Valves
Control of reheat solenoid valve to provide coil
fl ushing for positive refrigerant oil return
Can provide further Reheat control using up to (7)
Reheat Expansion Modules
Contains a 2 x 8 LCD character display and 4 buttons
that allow for status display, setpoint changes, and
confi guration changes
