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Table of Contents
Safety .............................................................................................................................................. 5
CN Series Feature String Nomenclature ......................................................................................... 9
General Information ...................................................................................................................... 12
Codes and Ordinances ............................................................................................................... 12
Receiving Unit ........................................................................................................................... 12
Storage ....................................................................................................................................... 12
Wiring Diagrams ....................................................................................................................... 14
General Maintenance ................................................................................................................. 14
Installation..................................................................................................................................... 15
Unit Placement .......................................................................................................................... 15
Curb and Steel Mount Installation ............................................................................................ 15
Lifting and Handling ................................................................................................................. 16
End Flashing Installation ........................................................................................................... 16
Mounting Isolation .................................................................................................................... 18
Access Doors ............................................................................................................................. 18
Low Ambient Operation ............................................................................................................ 18
Expansion Valve Operation ...................................................................................................... 18
Determining Refrigerant Line Size ........................................................................................... 18
Liquid Line ............................................................................................................................ 19
Suction Line ........................................................................................................................... 20
Hot Gas Bypass Line ............................................................................................................. 21
Hot Gas Reheat ...................................................................................................................... 22
LAC Valve ................................................................................................................................ 23
Condenser Flooding .................................................................................................................. 24
Electrical .................................................................................................................................... 24
Startup ........................................................................................................................................... 26
Axial Flow Condenser Fans ...................................................................................................... 26
Maintenance .................................................................................................................................. 30
General ...................................................................................................................................... 30
Compressors .............................................................................................................................. 30
Refrigerant Filter Driers ............................................................................................................ 30
Adjusting Refrigerant Charge ................................................................................................... 30
Lubrication ................................................................................................................................ 34
Air-Cooled Condenser ............................................................................................................... 34
E-Coated Coil Cleaning ............................................................................................................ 34
Microchannel Coil Cleaning ..................................................................................................... 35
Service ....................................................................................................................................... 35
Replacement Parts ..................................................................................................................... 35
AAON Warranty, Service and Parts Department ...................................................................... 35
Refrigerant Piping Diagrams ........................................................................................................ 36
CN Series Startup Form ................................................................................................................ 44
Maintenance Log .......................................................................................................................... 47
Literature Change History............................................................................................................. 48
