HVAC Questions? Ask an HVAC Expert for Answers ASAP
Hello there! I'm Norman but you can call me Norm. Let's see what I can do to get you some answers today. I'm ready to get started whenever you are.
Hope you are doing well today.
I can help you with your cross reference but I've noticed you don't currently have a common wire. Do you have an extra wire in the bundle in the wall?
I'll double check that right now.
Yes, i found one other wire, that is disconnected
Ok, here's what we need to do first.
We need to go to the furnace and find this spare wire up there. Then we need to strip it back and connect it to the C terminal on the furnace that way we have a common wire for the new thermostat. If you have trouble locating it let me know. Please turn the main power off first before trying to change any wiring.
I cannot locate the C terminal on the furnace wiring circuit board. It has B, W3, W2, W1, G, Y Lo, Y, O, BK, R, T.
Does the B have a wire already on it going to the outdoor unit?
Yes, it has two blue wires connected. One going to the thermostat, the other outside
Where does this wire go on the old thermostat?
The second R on the top
Oh wow. Okay. So are the two R's on your thermostat jumped together?
It does look something like that the first R is connected to the red wire, which corresponds to the R on the furnace
Ok we need to make sure this wire that is connected to B at the furnace is connected to the 24v COM on the new thermostat.
Note the color.
I will then provide you the other cross references to continue.
Be sure power is off to the system before you change over the wiring.
Seems like you already have the Common wire we needed. Sorry to send you searching.
Ok, the first (red) R needs to go to new 24vR
The one you had on B goes to new 24COM
The old F will be capped off.
The old Y will go to new Y1
The old x2 is not used.
The old w1 goes to new W1
The old G goes to the new G.
The old X2 terminal shouldn't have had anything on it anyways.
The old X2 is currently connected to W2 on the furnace.
ahhh. So connect this to the W2 on the new thermostat.
Thank you so much. I'm wiring now.
No problem at all.
What should i do with the wire that's connected to O on the furnace. I said it looked like the upside-down U (intersection), but now I can see the bottom part of the O on the old thermostat was worn off. The new thermostat does not have an O
Ok, one sec. Does your outdoor unit run when you're heating and cooling?
You kept saying Furnace and you're wiring coincided with a furnace. What you're saying now sounds like you have a electric heat pump.
Yes, sorry; it is an electric heat pump
Darn. This thermostat is a 2heat/2cool conventional model. Not meant for heat pumps.
Sorry I didn't catch that until right now but didn't see anything about an O terminal in your description.
Ah... so then I'm going to have to take it back and get a different model then?
Yes you need the heat pump model.
Multi-stage heat pump model I should say.
The wiring is pretty much the same except the old O goes to the new O or O/B and the old W2 will go to the new E terminal. The old W1 will go to the new AUX. All the rest should stay the same.
Depending on the thermostat you buy, you may need to read the installer setup and change the system type to multi stage heat pump.
I am going to have to step away from the site for awhile and may not be here when you get back. Please reply if you need more help later. If I can't help I'll opt out and let someone else step in and help.
If you get back and all is well with the wiring please remember to rate your experience so the request is finalized.
I'm back online. Keep me in the loop if you can.
It looks line Insteon does not have a model for Heat Pump, so I'm going to have to go with a different brand. I'm considering the Venstar T6800
Sounds good. Yes you'll need the multi-stage heat pump one for certain.
How would the wiring go for the T6800? I'm confised at the W1/0/B part.The 6 Wire, 1 Stage Cooling, 2 Stage Heat wiring for the T6800 lists:R 24VAC PowerC 24VAC CommonW1/O/B Reversing ValveY1 1st Stage Compressor (Cool or Heat)W2 Aux HeatG FanThis is what is currently connected:Old Thermostat Curcuit board Wire color24 Com B light blue24R R RedW1 W1 WhiteY Y Yellow0 0 Orange X2 W2 Black G G Green
Sorry, I accentally changed the currently connected one. It's really:This is what is currently connected:Old Thermostat Curcuit board Wire colorR B light blueR R RedW1 W1 WhiteY Y Yellow0 0 Orange X2 W2 Black G G Green
Ok, give me a minute to review and clarify.
Sorry I've had a lot going on here this afternoon. Looking now, sorry for the delay.
The old X2 goes to W2
The old G goes to new G
The old Y1 goes to new Y
The old R Com goes to the C terminal.
The old R red goes to the new R with a jumper to Rc if it has it.
The old O goes to the new O
The old W1 goes to the new AUX
Wait, All of your post confused me. I'm looking and two seperate post.
I'm having all types of chat problems, I'm sorry.
Ok, I have the Venstar wiring pulled up now, this will help.
The old R (red wire) goes to the new R terminal.
The old B (blue wire) goes to the new C terminal.
The old W1 wire will go to the new W2 terminal
The old W2 wire will go to the new W3 terminal
The old O wire will go to the new O/B terminal.
The old Y1 wire will go to the new Y1 terminal.
The old Y2 wire will go to the new Y2 terminal.
The old G wire will go to the new G terminal.
Make sure you follow the installation setup guide and select the multi-stage heating and cooling system.
I do not have a Y2 wire, I do have an X2 wire, but it connected to W2 on the heat pump
Crap I'm looking at the old thermostat again.
Man all these different letters are getting to me, must be getting tired, lol. Sorry.
Ok I'm sorry, Here we go.
The old Red R goes to the new R terminal.
The old Rb (blue wire) goes to the new C terminal.
The old O wire goes to the new O/B terminal.
lol no problem. I definitely understand.
The old F is not used.
The old Y goes to the new Y1
The old x2 goes to the new W2
Scratch that move x2 to W3
Put the old W1 on new W2
Old G to new G.
Old O to new O/B
Alright, this is what I got; does it look right:
Old Thermostat Curcuit board Wire color New ThermostatR B light blue CR R Red RW1 W1 White W2Y Y Yellow Y10 0 Orange O/BX2 W2 Black W3G G Green G
Thank you so much. That helped a lot!
LOL, no problem.
If you get her fired up and running please let me know.
The wiring you listed worked perfectly. Thank you. The only remaining problem I have is the fan won't turn on by itself... but it was doing that with the old thermostat as well. The fan does turn on with cooling and heating. Could that be the model of heat pump?
Yes, the wire is good... and actually after I took off the cover and let the Fan run, I realized it did turn on, just at a really low setting. I looked around and couldn't find any dip switches for changing the airflow for the fan by itself. I did see a dip switch for "airflow adjustment", but it doesn't seem to affect the fan when it's on by itself. There is also a switch for airflow with aux heat, but that's also unrelated. I'm beginning to wonder if it's the design of the heat pump to not allow the fan to run at high speed without the cooling/heating.
I was trying to send a picture, but I can't seem to get a good picture of it... too dark and flash makes it to bright. The model number is twe040e130a0, if that helps though.