Upgrading thermostat: wiring disaster
#1
10-06-16, 10:15 AM
Join Date: Oct 2016
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Upgrading thermostat: wiring disaster
I want to install a new smart thermostat and do not have a c wire run to my thermostat. I have a fairly new system but it was wired terribly. Currently my thermostat has W/E, RH(with bridge to RC), Y and G connected. The furnace has G, C, W, Y, R terminal. There are already wires to all terminals and C, W, Y all have 2 wires connected. Why are there so many wires. How can I deal with this mess and rewire? Can I disconnect all and simply run new wires?
#2
10-06-16, 10:22 AM
Group Moderator
Welcome to the forums.
That's not a mess......that's the way it is. You are going to have two wires on C and Y because they go to the stat and the outside condensor. Now you will have three wires on the C terminal.
Do you have the extra wire needed to supply the stat with a C connection ?
That's not a mess......that's the way it is. You are going to have two wires on C and Y because they go to the stat and the outside condensor. Now you will have three wires on the C terminal.
Do you have the extra wire needed to supply the stat with a C connection ?
#3
10-06-16, 04:06 PM
You are going to need to trace the wires that you have and document where each one goes. Two wires on W at the furnace can mean you have a heat pump or a humidifier or something odd.
Sometimes there is an extra wire that goes to the thermostat but is cut off or otherwise still in the wall.
Sometimes there is an extra wire that goes to the thermostat but is cut off or otherwise still in the wall.
#4
10-06-16, 04:28 PM
Group Moderator
I hadn't addressed the W wire yet. I don't believe there's a heat pump involved as there is no O/B connection or wire for it.
I have a feeling the two W wires are stat and humidifier.
I have a feeling the two W wires are stat and humidifier.
