Advantages:
i. Lower piping cost
ii. High water temperature drops
Disadvantages:
i. Each fan coil loading cannot be controlled separately
Diverting Circuit:
LOAD
FCU 3
LOAD
FCU 1
LOAD
FCU 2
LOAD
FCU 4
Advantages:
i. Allows individual control to each fan coil unit
Disadvantages:
i. Only fan coil units with low pressure drops can be used
ii. Due to low water velocity in each fan coil, an air vent is required for
each fan coil
iii. Higher installation cost
iv. Water entering temperature for each fan coil is different, i.e. it gets
higher further away from the source
However, both the series and diverting circuits are seldom used in hydronic systems. The
more commonly used are the parallel circuits because they allow the same water
temperature to be available to all fan coil units.
It is recommended that the parallel circuits to be used in the installation of the mini chillers
with the fan coil units.
Section 2 Page 10
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