Table of Contents
Nomenclature .......................................................................................................................................................................3
Safety Considerations ..........................................................................................................................................................4
General Information ..............................................................................................................................................................4
Recommended Spare Parts ...........................................................................................................................................4
Inspection on Arrival .......................................................................................................................................................5
Unit Application Limitations ...........................................................................................................................................5
Unit Location Requirements ...........................................................................................................................................5
Roofcurbs Supplied by Venmar CES (External Applications Only) ................................................................................6
Roofcurbs Supplied by Others .......................................................................................................................................6
Rigging and Lifting the Unit ............................................................................................................................................7
Exhaust Dampers ...........................................................................................................................................................7
Field Fabricated Ductwork .............................................................................................................................................8
Hood Installation ............................................................................................................................................................9
Access Panels ................................................................................................................................................................9
Internal Packaging ..........................................................................................................................................................9
Electrical Connections..................................................................................................................................................10
Coil or Water Source Heat Pump (WSHP) Piping Connections ...................................................................................12
Condensate Drain Trap ................................................................................................................................................13
Refrigeration Systems ..................................................................................................................................................13
Pre Start-up Procedure ................................................................................................................................................14
Start-up Procedure.......................................................................................................................................................15
Optional Controls and Accessory Sequence and Interlocks .......................................................................................16
Frost Control ................................................................................................................................................................17
Airflow Balancing ..........................................................................................................................................................18
Air Filters ......................................................................................................................................................................19
Interior of Unit ...............................................................................................................................................................19
Fans ..............................................................................................................................................................................20
Enthalpy Wheel.............................................................................................................................................................22
Testing and Replacement of the Damper Actuator ......................................................................................................23
Coils .............................................................................................................................................................................24
Refrigerant Systems .....................................................................................................................................................24
System Operation Check .............................................................................................................................................25
Appendix A: Service Clearance Dimensions ......................................................................................................................26
Appendix B: Hood Installation ............................................................................................................................................34
Appendix C: Rigging Drawing ............................................................................................................................................35
Appendix D: Equipment Data .............................................................................................................................................36
Appendix E: Effect of Undersized Straight Duct and Elbows on Forward Curved Fans....................................................37
Appendix F: Electrical Data ................................................................................................................................................38
Appendix G: Standard Field Wiring Terminals ...................................................................................................................42
Appendix H: Terminal Control Diagrams ............................................................................................................................44
Appendix I: Water Source Heat Pump Water Line Piping Requirements and Field Mounted Options and Accessories ..48
Appendix J: VHC-36, -42 and -50 Start-up Form and Checklist .......................................................................................57
Appendix K: Gas-fired Furnace Module Installation and Maintenance ..............................................................................63
Appendix L: Electric Heating Coil and Controls Information ..............................................................................................79
Appendix M: Enthalpy Wheel Pressure Drop vs. Flow Formulae and Curves ...................................................................81
Appendix N: Troubleshooting.............................................................................................................................................82
Appendix O: VHC-36, -42 and -50 Maintenance Summary Chart .....................................................................................84
Appendix P: Forward Curved Fan Bearing Relubrication Schedule ..................................................................................86
Appendix Q: How to Measure, Assemble and Install Link Belt ..........................................................................................87
Appendix R: Adjusting Refrigerant Charge ........................................................................................................................89
Appendix S: Temperature Rise Over Gas-fired Furnace ....................................................................................................91
VCES-VHC-IOM-1F – VHC-36, -42 & -50
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