Parallel Direct Return
Vertical installation
Fan coil
unit
Horizontal installation
The basis for the design is "First In - First Out".
In this system, the length of supply and return piping for each fan coil is unequal. This will
affect the water flow rate through each individual load. Proper balancing is required to
provide adequate water flow rate for each fan coil.
Nevertheless, the cost of installation is lower compared with the reverse return configuration
due to the shorter pipe length needed. Therefore, this method is more economical for
installation of fan coils with different pressure drops and balancing valves are used.
This method is also suitable for open system applications whereby the return from the
fan coil loads are discharged into a external tank.
Section 2 Page 11
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