Fan Coil Wiring
Fan-coil conditioner fans are driven by small motors, generally
shaded pole or capacitor start with inherent overload protection.
Operating wattage of even the largest sizes rarely exceeds 300
W at the high speed setting. Running current rarely exceeds 2.5
A. Almost all motors on units in the United States are 120 V,
single phase, 60 Hz current, and they provide multiple (usually
three) fan speeds and an off position. Other voltages and power
characteristics may be encountered, depending on location, and
should be investigated before determining the fan motor characteristics.
In planning the wiring circuit, required codes must be followed.
Wiring methods generally provide separate electrical circuits
for fan-coil units and do not connect them into the lighting circuit.
Separate electrical circuits connected to a central panel allow
the building operator to turn off unit fans from a central point
during unoccupied hours. While this panel costs more initially,
it can lower operating costs in buildings that do not have 24
hour occupancy. In hot and humid climates care must be taken to
avoid excess humidity when units are off to avoid formation of
mildew. Use of separate electrical circuits allows a single remote
thermostat to be mounted in a well-exposed perimeter space to
operate unit fans.