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ABB i-bus
®
EIB / KNX
Application and planning
3.4 Operating
mode:
“Fan coil control”
3.4.1 Terms
A fan coil unit is connected to a central heating and cooling supply and
generates the required temperature room by room. A room can be heated,
cooled and ventilated with a fan coil unit.
3.4.2
Structure of an HVAC
system with fan coil units
An HVAC system with fan coil units (HVAC = Heating, ventilation, air-
conditioning) consists of a central hot and cold water supply. Fan coil units
are mounted in the rooms and directly connected to the hot and cold water
circulation loops.
Fan Coil Units
Hot water circulation loop
Cold water circulation loop
Boiler and cold
water supply
Fig. 8: Structure of an HVAC system with fan coil units
3.4.3
Structure of a fan coil unit
The heat exchangers and the fan are the most important components of a
fan coil unit. The hot or cold water flows into the heat exchangers depending
on the room temperature required. The flow of water through the heat
exchangers is controlled via the valves.
Valves
Drip tray
Fan
Motor
Switchbox
with controller
Filter Heat
exchanger
Fig. 9: Structure of a fan coil unit
The fan blows air past the heat exchangers and through a filter into the
room. The air is heated or cooled at the heat exchangers and thus generates
the required room temperature. The fan is driven by a motor. The motor and
the valves are regulated by the Fan Coil Controller FC/S 1.1.
The condensed water that is generated by the cooling process is collected in
a drip tray.
© 2004 ABB STOTZ-KONTAKT GmbH
21
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