from MEEB 9th ed.
All Water Systems
General:
Typically deal only with temp. control, air quality is left to separate systems.
Only heat and cool, distribution trees are slim.
Air quality is dealt with elsewhere, either locally, by means of infiltration or windows, or by a separate fresh air supply system, or simply by fresh air from an adjacent system, such as a ventilated interior zone.
Familiar all water application is the simple fan coil unit.(Because units with the same name are used in air and water systems, this further blurs the distinction between these two HVAC families)
The units may be found above ceilings, below windows or in corners, simply control the temp. (and to a limited extent, the relative humidity) of the air already in the room, which is blown through the coils.
Condensation on the coils occurs requiring a drain pan and drain line.
Common in motels, hotels and apartments.
Inherently noisy due to fan coil unit.
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