ertical Installation
The basis for the design is "First In - Last Out".
In this installation, the supply and return water pipes or of nearly equal lengths. Thus, it seldom
requires balancing of water flow rate for individual fan coil unit. If required, this balancing will be
easier.
This method is recommended if all the fan coil units have the same or nearly the same
pressure drops.
Another advantage of this reverse return system is a reduction of the working pressure drop
across any balancing valves used for the fan coil units.
However, such a system is not recommended for high-rise buildings because of the vertical
weight of the extra piping required. In such instances, it may be more practical to use direct
return systems.
The extra piping also does not give any advantage in open system applications because the
same atmospheric conditions exist at all open points of the system.
Section 2 Page 12
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