Orion System MHGRV III User Manual

Page 2

2425 So. Yukon Ave • Tulsa, OK • 74107-2728

Ph: (918) 583-2266 • Fax: (918) 583-6094

AAON

Part No.: R76540

WM Form: AA-MHGRVIII-TGD-01D

Master Controls, Inc. • 8500 NW River Park Drive • Parkville, MO 64152

AAON

is a registered trademark of AAON, Inc., Tulsa, OK.

WattMaster Controls, Inc. assumes no responsibility for errors or omissions.

This document is subject to change without notice.

Table of Contents

Controller Overview ......................................................................................................................................... 3

Inputs and Outputs .......................................................................................................................................... 4

General.........................................................................................................................................................................................4
Analog Inputs ...............................................................................................................................................................................4
24 VAC Contact Closure Inputs ....................................................................................................................................................4
Analog Outputs.............................................................................................................................................................................4
Relay Outputs...............................................................................................................................................................................4
Modulating HGR Valve Outputs ...................................................................................................................................................4

Installation & Wiring ........................................................................................................................................ 5

Controller Mounting ......................................................................................................................................................................5
Important Wiring Considerations ..................................................................................................................................................5
Additional Modulating Hot Gas Valve Control ..............................................................................................................................5
MGHRV III Controller Master To Slave Wiring when Used with VCM Controller .........................................................................6
MGHRV III Controller Master To Slave Wiring when Used with VCM-X Controller ......................................................................8
MGHRV III Controller Master To Slave Stand Alone Wiring .......................................................................................................10

DIP Switch Settings ....................................................................................................................................... 12

Supply Air Temperature ..............................................................................................................................................................12
Supply Air Temperature Reset Limit ..........................................................................................................................................12
Field Testing ...............................................................................................................................................................................13

Start-up & Commissioning............................................................................................................................. 14

Sequence of Operation .................................................................................................................................. 15

Initialization.................................................................................................................................................................................15
Modulating Hot Gas Valves ........................................................................................................................................................15
Modes of Operation ....................................................................................................................................................................15
Additional Features ....................................................................................................................................................................15

Troubleshooting ............................................................................................................................................. 16

Using LEDs to Verify Operation..................................................................................................................................................16
Other Checks .............................................................................................................................................................................16