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Fan Coil Actuator FCA 2
6.5 Frost protection (or heat protection) via window contact
6.5.1 with external controller
The window contact is connected to E1. The window status is transmitted to the bus by object 14
as a command to the external controller.
This can change automatically in frost or heat protection mode when a window is opened.
The function of E1 parameter on the E1 parameter page must be E1 = window contact.
6.5.2 with internal controller
This function is only possible if the Objects for operating mode selection parameter on the
Operating mode and operation parameter page is set to new: operating mode, presence, window
status.
The information "window is open" can be recorded in 2 ways:
• The window contact is connected to a binary input (e.g. BMG 6 *) and the window status
is received on object 23.
• The window contact is connected to E2 (only possible with Supported function =
heating).
Important: The corresponding switch object (object 16 Status E2) has to be linked with
object 23 (Input window contact) via the group address.
FCA 2 will recognise when the window is opened and automatically switch to frost
protection mode (heat protection mode).
When the window is closed, the previously set operating mode will be restored.
* Order No.: 491 0 230
6.6 Dead zone
The dead zone is a buffer area between eating and cooling mode.
Within this dead zone neither heating nor cooling occurs.
Without this buffer area, the system would permanently switch between heating and cooling. As
soon as the setpoint was fallen below, the heating would be activated. After hardly reaching the
setpoint, the cooling would immediately start, the temperature would fall below the setpoint and
switch on the heating again.
Updated: Feb-16 (subject to changes)
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