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Fan Coil Actuator FCA 2
6.7.4 Heating and cooling in the 2-pipe system
Figure 14
The following points must be observed for use in a 2-pipe heating/cooling system:
•
In the 2-pipe system, heating and cooling mediums (depending on the season) are lead
through the same lines and controlled via the same valve.
This is connected to the terminals for valve V1.
•
The changeover between heating and cooling medium is performed by the system, and
must therefore be passed on to the controller.
The heating/cooling system must send a 0 for heating mode and a 1 for cooling mode to
Object 1 "Changeover between heating and cooling" in FCA 2.
6.7.5 Heating and cooling in the 4-pipe system
Figure 15
When used in a 4-pipe heating/cooling system, the heating valve is connected to the V1 terminals,
and the cooling valve to the V2 terminals.
Updated: Feb-16 (subject to changes)
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