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upgrade from communicator tstat to wifi ..help

Posted by cara7 (My Page) on
Sat, Aug 30, 14 at 8:29

I have a carrier a/c unit and Lennox furnace w heat pump. It has a air handler that only has the tstat connected for communication. The wiring shows V+(red) and Vg(white) for inputs at handler and red and green at the original carrier tstat. I am trying to upgrade to a WiFi thermostat (iris) but need the full remaining w, y, b wires. I have tried to disconnect the tstat wires at handler side to "break" communications, thus keeping
the 5 wires connected at both ends. Still doesn't work.


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RE: upgrade from communicator tstat to wifi ..help

What model Carrier air handler and thermostat do you currently have? Are they connected with 4 wires?


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