Smoke alarm - technical FAQs

Is it possible to connect two Aico deaf alarm control panels (Ei175 or Ei176) in the same system?

Yes, in fact you may interconnect more than two Ei175 and Ei176 control units.

A minor but important wiring modification is required. EI175 and Ei176 control units supply 9V dc power for low voltage smoke heads (particularly good as then there are no 9V alkaline batteries to replace each year) - the inter-connection uses 3 wires: 0 Volt, 9 Volt dc and the control/interconnect signal. When interconnecting more than 2 Ei175 and Ei176 control units it is important to NOT connect the 9 volt dc wire between control units.

Normally one would just not use the 9 volt supply from one control unit, but if they are on different floors you could use the Aico EI175 / Ei176 control unit to power the smoke heads near them.

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