Atest Gaz Alpa EcoWent XT, User Manual

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6.1 Star system
In the conventional system each detector is individually connected to the control unit. This solution requires
the input of a large number of wires to the control unit, which can be a serious impediment to the assembly
– particularly in large buildings, and the increase in wiring costs.
Figure 4: Connection with the Alpa MOD LED8 control unit into a star-shaped system
A detailed diagram is shown in Appendix [3].
6.2 Open alarm loop
In this arrangement, the detector are connected in series to the bus line via the XT T-connector. An
advantage of this solution is significant facilitation of the system installation and reducing the wiring costs.
Figure 5: Connection with the Alpa MOD LED1 control unit into an open bus system
In the last Alpa EcoWent XT detector (the most remote one from the control unit) of the
open bus system, the configuration switch on the plate must be set to position 2 (see Figure
8). Inappropriate switch setting causes the system to malfunction (indicating failure and lack
of response to a signal from the following detectors).
A detailed diagram is shown in Appendix [3].
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User Manual: POD-042-ENG R04