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ABB i-bus
®
KNX
Function
FCC/S 1.X.X.1 | 2CDC 508 200 D0211 Rev A 78
4
Function
4.1
Fan coil unit overview
Configuration design types
A fan coil unit can be configured as a compact device or a modular installation device:
•
Compact devices: These are supplied with enclosures and are available as self-contained units
or for wall or ceiling mounting.
•
Built-in devices: These have no enclosures and are mounted in the wall, in the ceiling or in the
floor. The air is blown into the room through a grille.
Air supply
Fan coil units are available as recirculation or as mixed air devices.
•
Recirculation devices: The room air is directed past heat exchangers by the fans.
•
Mixed air devices: The room air is mixed with fresh air. The mixing ratio between recirculated
and fresh air can usually be adjusted.
4.2
Functional overview
Fans, also called blower convectors and fan coil units, are used for distributed heating and cooling
applications. They are installed rooms and powered via central heating and cooling systems. Using
fans, room temperature can be quickly adjusted to suit individual preferences.
The Fan Coil Controllers FCC/S control fans either as a single-phase fan with up to three fan
speeds via step or changeover actuation, or a continuous fan via 0 … 10 V actuation. For speed-
controlled fans in Changeover operation mode, it is ensured that no two fan speeds can be
switched on simultaneously. An additional programmable switch-over delay is provided for this pur-
pose. Three-phase drives are not supported.
Four inputs are available for connecting temperature sensors and for monitoring a window contact,
condensate formation or a collection pan. Additionally, one of the inputs can be used to connect a
local analog room control unit (SAF/A or SAR/A). Such a device can be used for local adjustment
of the setpoint temperature for the room and the fan speed. When another input is used, the room
temperature additionally can be measured directly via the analog room control unit. The scanning
voltage for the inputs is provided by the Fan Coil Controller.
An electric heater can be actuated via an additional floating relay contact.
In addition to the distinction in the type of fan actuation (3-speed or continuous), the Fan Coil Con-
trollers differ in the type of valve actuation.
Fan Coil Controllers FCC/S 1.1.x.1 and FCC/S 1.5.x.1 have two outputs to actuate electrothermal
heating or cooling valves or to actuate a motorized (3-point) drive. The FCC/S 1.4.1.1 features only
one output to actuate electrothermal heating or cooling valves
Fan Coil Controllers FCC/S 1.2.x.1 and FCC/S 1.3.x.1 have two outputs to actuate analog heating
and cooling valves.
Manual operation of the device is possible in the versions FCC/S 1.1.2.1, FCC/S 1.2.2.1, FCC/S
1.3.2.1 and FCC/S 1.5.2.1.
FCC/S
1.1.1.1
FCC/S
1.1.2.1
FCC/S
1.2.1.1
FCC/S
1.2.2.1
FCC/S
1.3.1.1
FCC/S
1.3.2.1
FCC/S
1.4.1.1
FCC/S
1.5.1.1
FCC/S
1.5.2.1
Inputs
4
4
4
4
4
4
4
4
4
Analog room control unit
1
1
1
1
1
1
1
1
1
Binary sensor
(e.g.: window contact, dew
point, fill level)
4
4
4
4
4
4
4
4
4