> For the complete documentation index, see [llms.txt](https://docs.betterbuilding.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.betterbuilding.io/user-guide/2d-building/building/hvac/hvac-templates/system-no.-5-two-pipe-fan-coil-n-a.md).

# System No. 5 Two-pipe Fan Coil (N/A)

A Two-Pipe Fan Coil system, as defined in EnergyPlus HVACTemplate, is a climate control system commonly used in hotels, apartments, office buildings, and other multi-zone applications. 

It consists of individual fan coil units installed in each zone, connected to a central two-pipe hydronic loop that circulates either chilled water for cooling or hot water for heating, depending on the season. Each fan coil unit contains a coil through which the water circulates, transferring heat to or from the air, and a fan that distributes the conditioned air throughout the space. The two-pipe configuration requires seasonal changeover between cooling and heating modes, as the system can only provide one function at a time. The system ensures individual zone temperature control and relatively quiet operation. 

This configuration is particularly suitable for applications where decentralized zone control with a simple, cost-effective hydronic distribution system is preferred.

A Two-Pipe Fan Coil system comprises:

* Plant HVAC component - Two-Pipe Hydronic System (Heating/Cooling Changeover)
* Space HVAC component - Two-Pipe Fan Coil Unit

The 'Select HVAC Template' form allows for multiple Spaces to be served. Clicking into the 'Spaces' field shows a list of available Spaces. Each selected Space will have one Two-Pipe Fan Coil Unit Space HVAC component, providing individual zone climate control.


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