View single post by slychiu

Posted: Wednesday Mar 22nd, 2017 05:24 pm

Joined:	Saturday Apr 29th, 2006
Location:	Singapore
Posts:	5498
Status:	Offline

Yes you are correct. Comfort 2 logic level changed to 3V - new logic tends to be lower voltage and current

You may measure 1.5V at the zone terminals due to internal resistance
The Comfort Inputs generally require dry contact
Typically a sensor lime smoke or PIR would have a 12V supply from Comfort and give a dry contact to the zones. This is the preferred and commpn method for sensors.

If the sensor is only 2 wires without a separate supply then you may need an interface circuit for it to work properly

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