TABLE OF CONTENTS
MHGRV-X Field Technical Guide
2
AAON Controls Inc.
8500 NW River Park Drive · Parkville, MO 64152
Toll Free Phone: 866-918-1100
PH: (816) 505-1100 · FAX: (816) 505-1101
E-mail: mail@wattmaster.com
Visit our web site at www.orioncontrols.com
www.aaon.com
Copyright June 2018 AAON Controls, Inc.
AAON
®
Manual Part No.: V16950, Rev. 01M
AAON
®
is a registered trademark of AAON, Inc., Tulsa, OK.
AAON Controls assumes no responsibility for errors or
omissions in this document.
This document is subject to change without notice.
CONTROLLER OVERVIEW ............................................................................................................... 3
Features ................................................................................................................................................................... 3
INSTALLATION & WIRING ............................................................................................................... 4
Important Wiring Considerations .............................................................................................................................. 4
MHGRV-X Controller to AAON Unit Controller Wiring.............................................................................................. 5
MHGRV-X Stand Alone Wiring ................................................................................................................................. 6
INPUTS AND OUTPUTS .................................................................................................................. 7
OPERATION OVERVIEW .................................................................................................................. 8
Initialization .............................................................................................................................................................. 8
Modulating Hot Gas Valves ...................................................................................................................................... 8
Modes of Operation ................................................................................................................................................. 8
Additional Features .................................................................................................................................................. 9
LCD DISPLAY SCREENS ................................................................................................................ 10
TROUBLESHOOTING ..................................................................................................................... 14
Using LEDs to Verify Operation ............................................................................................................................. 14
Temperature Sensor Testing ........................................................................................................................................15
APPENDIX A - Supply Air Temperature Sensor Guide ................................................................. 18
Supply Air Temperature Sensor Installation ........................................................................................................... 18
Supply Air Temperature Sensor Wiring Chart and Jumper Settings ...................................................................... 19
APPENDIX B .................................................................................................................................. 20
MHGRV-X Replacement of MHGRV II ................................................................................................................... 20
APPENDIX C .................................................................................................................................. 21
Reheat Expansion Module ..................................................................................................................................... 21
PART NUMBER TABLE
PART DESCRIPTION AAON
TULSA
MHGRV-X Controller V12100
Reheat Expansion Module V42450
MODGAS-X Controller V12090
Supply Air Temperature Sensor P87140
EBC E-BUS Cables - Varying Lengths N/A
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