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6.5.2.2.2 Two-Pipe Changeover System
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Systems that use a common distribution system to supply both heated and chilled water are acceptable provided all of the following are met:
- The system is designed to allow a dead band between changeover from one mode to the other of at least 15°F outdoor air temperature.
- The system is designed to operate and is provided with controls that will allow operation in one mode for at least four hours before changing over to the other mode.
- Reset controls are provided that allow heating and cooling supply temperatures at the changeover point to be no more than 30°F apart.
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