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Message
Why does my Trane Thermostat Only Have 3 Wires Connecting to It?
Posted on 7/12/21 at 1:15 pm
Posted on 7/12/21 at 1:15 pm
want to replace this thermostat with an ecobee smart thermostat and the instructions say to take a picture or note where the wires are located on the current thermostat. well, i have 8 wires total and only 3 are connected. also, the plugs don't have your normal labels.
Brown > D
Red > R
Blue > B
Black > not connected
Green > not connected
White > not connected
Orange > not connected
Yellow > not connected
Brown > D
Red > R
Blue > B
Black > not connected
Green > not connected
White > not connected
Orange > not connected
Yellow > not connected
3
Posted on 7/12/21 at 1:54 pm to finchmeister08
That's the way mine were wired. When I added Nest thermostats, I had to use the white common wire as the 4th.
Posted on 7/12/21 at 2:04 pm to finchmeister08
It appears your t-stat is a communicating t-stat that uses proprietary communication.
If you don't want to screw up and have to completely re-wire/re-setup your system, dont replace the t-stat. Communicating t-stats have a lot of control advantages.
If you don't want to screw up and have to completely re-wire/re-setup your system, dont replace the t-stat. Communicating t-stats have a lot of control advantages.
Posted on 7/12/21 at 2:09 pm to notsince98
quote:
It appears your t-stat is a communicating t-stat that uses proprietary communication.
If you don't want to screw up and have to completely re-wire/re-setup your system, dont replace the t-stat. Communicating t-stats have a lot of control advantages.
this ^^^^^^^
have it replaced by a/c tech so he can wire it correctly and not short things out costing you money and down time
or leave it alone, whichever suits you best, but i wouldnt suggest a home owner mess with the control wiring, because you dont know enough to know what you are doing.
ps that last wiring diagram pic is for standard thermostat connections
Posted on 7/12/21 at 2:15 pm to keakar
quote:
ps that last wiring diagram pic is for standard thermostat connections
i figured as much. so trane is the only company that has to be different?
how did i pick a house that has a completely different wiring diagram.
Posted on 7/12/21 at 2:15 pm to finchmeister08
This video may assist you.
Posted on 7/12/21 at 2:17 pm to AlxTgr
quote:
This video may assist you.
i don't know if you saw the images in the OP or not, but non of the labels in my current thermostat match the "standard" labels typically seen in a thermostat.
Posted on 7/12/21 at 2:39 pm to finchmeister08
quote:
i figured as much. so trane is the only company that has to be different?
how did i pick a house that has a completely different wiring diagram.
the wiring is there, the unused ones, so its not a big deal to have it redone, should be no more then a 1 hr service call if you have thethermostat on hand you want to use
the issue is you done know whether those wires are hooked up or not at the heater so if you hook up the wrong one it can blow a fuse or burn out a circuit board $$$$$$$$$$$
so the a/c tech will open the heater up and wire the controls to match the new thermostat wiring
This post was edited on 7/12/21 at 2:51 pm
Posted on 7/12/21 at 2:54 pm to finchmeister08
Every company offers communicating controls. It is typically required for the higher end/higher efficiency setups. You'd be stepping backwards if you went to something like nest/ecobee. They are gimmick t-stats at best and not for optimal performance.
Posted on 7/12/21 at 3:18 pm to finchmeister08
That stat is wired using Modbus communications between the stat and the air unit board. It's an expensive stat. As people have said, there are multiple control advantages to a communication stat like more advanced diagnostics, more information presented to the user, etc. Most companies have a communicating stat like this in their products (Trane, York, Carrier,etc) and usually its the most expensive option.
Posted on 7/12/21 at 3:31 pm to finchmeister08
quote:Right, but you have the colors. I've always just followed vids like this and it's always worked out. The one time it didn't, nothing was damaged-I just needed an extra wire.
i don't know if you saw the images in the OP or not, but non of the labels in my current thermostat match the "standard" labels typically seen in a thermostat.
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