How To connect An Advent Air AC System With 1 Furnace Wire To A 2-Wire Furnace

Updated 07/19/2023 | Published 07/18/2023

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Digital Multimeter with 42" Long Test Leads - LED Display

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Question:

Ok I bought your 15,000 advent air unit. My prior Duo therm has 6 wire thermostat. the white wire being the furnace. the ACTH12 has four. do i connect the Brown and white stripe wire to my white wire at the roof AC?

asked by: Bryan H

Expert Reply:

Typically if there are two wires running from the furnace to the AC system then it means that the furnace has power already connected to it and it sends that through one of the wires up to the AC until the system calls for heat, at which point the relay will close and send power back to the furnace through the other wire. You'll want to connect the brown and white wire from the controller # ACRG15 to the other wire send power back to the furnace.

To determine which wire is which you can use a multimeter # PT89ZR and place one lead to a good ground and the positive lead to either wire. One wire should read 12v DC and would be the power running from the furnace to the AC. You'll connect the AC wire to the other furnace wire so it can send power to furnace to activate it as needed.

expert reply by: Kevin C