Mammoth 800 to 5500 CFM: Dedicated Outdoor Air System with Enthalpy Wheels (VHC) User Manual
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MAMM-VHC-IOM-1A (JANUARY 2013)
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Table of Contents .................................................................................................................................................................2
Nomenclature .......................................................................................................................................................................3
Safety Considerations ..........................................................................................................................................................4
General Information ..............................................................................................................................................................4
Unit Application Limitations ............................................................................................................................................4
Installation ............................................................................................................................................................................4
Unit Location Requirements ...........................................................................................................................................4
Roofcurbs Supplied by Mammoth (External Applications Only) .....................................................................................5
Roofcurbs Supplied by Others .......................................................................................................................................6
Rigging and Placing the Unit ..........................................................................................................................................6
Field Fabricated Ductwork ..............................................................................................................................................6
Hood Installation .............................................................................................................................................................7
Access Panels ................................................................................................................................................................7
Internal Packaging ..........................................................................................................................................................7
Electrical Connections ....................................................................................................................................................8
Water Source Heat Pump (WSHP) Water Piping and Connections .............................................................................10
Condensate Drain Trap ................................................................................................................................................10
Start-up ...............................................................................................................................................................................11
Pre Start-up Procedure ................................................................................................................................................11
Start-up Procedure .......................................................................................................................................................11
Optional Controls and Accessory Sequence and Interlocks ........................................................................................12
Frost Control .................................................................................................................................................................13
Airflow Balancing ..........................................................................................................................................................14
Service................................................................................................................................................................................15
Quarterly Maintenance .................................................................................................................................................15
Annual Maintenance .....................................................................................................................................................15
Coils .............................................................................................................................................................................15
Testing and Replacement of the Damper Actuator ......................................................................................................16
Motor and Blower Removal – Down, Side and End Supply/Exhaust ...........................................................................16
Motor and Blower Service – Down, Side and End Supply/Exhaust .............................................................................16
Belt Tension Adjustment ..............................................................................................................................................17
Plenum Fan and Motor Removal ..................................................................................................................................17
Plenum Fan and Motor Service ....................................................................................................................................18
Cassette Removal ........................................................................................................................................................18
Cassette Service ..........................................................................................................................................................19
Appendix A: Service Clearance Dimensions ......................................................................................................................20
Appendix B: Hood Installation ............................................................................................................................................21
Appendix C: Rigging Drawing.............................................................................................................................................22
Appendix D: Equipment Data .............................................................................................................................................23
Appendix E: Electrical Data ................................................................................................................................................24
Appendix F: Terminal Control Diagrams ............................................................................................................................27
Appendix G: Standard Field Wiring (FW) Terminals ..........................................................................................................30
Appendix H: VHC-36, 42 and 50 Start-up Report and Checklist ........................................................................................31
Appendix I: Troubleshooting ...............................................................................................................................................35
Appendix J: Electric Heating Coil and Controls Information ...............................................................................................37
Appendix K: Water Line Field Mounted Options and Accessories .....................................................................................39
Appendix L: Enthalpy Wheel Pressure Drop vs. Flow Formulae and Curves ...................................................................47
Table of Contents
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