ABB i-bus
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Planning and application
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4.4.3
Configuration of a
HVAC system with
Fan Coil units
A HVAC system with Fan Coil units (HVAC = heating, ventilation,
air-conditioning) consists of a central heating and cooling water system.
The Fan Coil units are installed in rooms and directly connected to the
heating and cooling circuit.
4.4.4
Design of a
Fan Coil unit
The Fan Coil unit consists of a fan or blower-convector and one or two heat
exchangers, which emit heating or cooling power to the room.
If only one heat exchanger and one heating or cooling circuit is available,
you have a 2 pipe system.
If two heat exchangers with two separate heating and cooling circuits are in
use, you have a 4 pipe system. The Room Master directly controls the fan.
The heat exchanger and the fan are the most important components of a
Fan Coil unit. Heating or cooling water flows in the heat exchanger
depending on the desired room temperature. The flow of water through
the heat exchanger is controlled via the valves.
Fan coil units
Hot water circulation loop
Cold water circulation loop
Boiler and
cold water supply