Expansion valve, electrical panel with full interlocking system, reciprocating chillers complete control panel, evaporators, and fault indication. The Packaged Chillers are put through a rigorous 48-hour testing process as part of our quality control system. Before sending out packaged chillers, the client is always insisted upon doing a physical inspection and performance test. For more details visit this website - https://www.refconchillers.com/reciprocating-chillers.asp