upgrade from communicator tstat to wifi ..help

cara7August 30, 2014

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

    Bookmark   September 21, 2014 at 11:09AM
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