Thermostat Wiring help

[Elizabeth Santisi]

I disconnected my old thermostat before labeling the wires. I know not smart.
I have a picture of the diagram from the furnance and a few pictures of the wiring, attached

From what can see:

G in the furnace connects to a green wire which is connected with a wire nut to a green wire leading to the thermostat. This should be connected to the "G" terminal

R in the furnace connects to a red wire which is connected with a wire nut to a red wire leading to the thermostat. This should be connected to the "R" terminal

C in the furnace connects to a blue wire which is connected with a wire nut to a blue wire leading to the thermostat. This should be connected to the "C" terminal

There is a Brown and a White wire leading from the furnace which are connected with a wire nut. These wires are connected to a white wire and a black wire which lead to the termostat. I assume the white wire should be connected to the "W" terminal and the black wire should be connected to the "E/AUX" terminal

There is an orange wire which bypasses the furnance and is connected to an orange wire which leads to the thermostat. I assume this should be connected to the "O/B" terminal

There is a yellow wire which bypasses the furnance and is connected to a yellow wire which leads to the thermostat. I assume this should be connected to the "Y" terminal

Can you please help me confirm my above assumptions are correct? Does this mean I have a Heat Pump with backup or auxilary heat?

Thanks!!

 

[gordyy]

I can't blow up your schematic enough to be sure but it looks like a 2 stage electric furnace? A/C on it too?
be careful if you need a 2 stage electric stat and you got one at a big box you might be buying a couple thermostats and some other electrical components
Furnaces are not all the same and if you don't have something standard a good buy at the discount store is a big bill when you get a repair tech in to fix it all

 

[Elizabeth Santisi]

Thank you for your feedback. I broke up the original diagram into sections and blew it up. I'm also attaching a diagram of the wiring instructions for the new thermostat i'm looking to install.

Here is a link to the new thermostat http://www.lowes.com/pd_171234-7449...Ns=p_product_qty_sales_dollar|1&facetInfo=Yes

I also attached the setting options for the new thermostat...

I assumed I would choose option 5 - Heat Pump wih Backup

But you're saying i should choose one of the Multiple stages options?

Thanks In Advance!

 

[gordyy]

do you have a heat pump with this? all the schematic is showing is a 2 stage electric furnace.
its really hard to tell where your wires are all going and breaking it up did not help
its hard to tell you what goes where as we only have part of the system shown

 

[Elizabeth Santisi]

no problem! what else would you need?

 

[anthony666]

if it were me i'd put my old tstat back on .. you got 3 of the wires figured out, yea .. it's not that difficult to figure out where the rest went based on how long they are, what screws are backed off etc etc .. you should be able to get it back together .. and at least that way you can verify that it's right and take a picture/label it etc

 

[Elizabeth Santisi]

I'm not able to put the old one back on unfortunately. I did however verify that I have a heat pump (googled the model number CPLT30-1A) and I know I have emergency heat since it kicked on once and cost us a fortune. I believe my original wiring assumptions were correct, but if anyone wants to confirm for me that would be appriciated:

G in the furnace connects to a green wire which is connected with a wire nut to a green wire leading to the thermostat. This should be connected to the "G" terminal

R in the furnace connects to a red wire which is connected with a wire nut to a red wire leading to the thermostat. This should be connected to the "R" terminal

C in the furnace connects to a blue wire which is connected with a wire nut to a blue wire leading to the thermostat. This should be connected to the "C" terminal

There is a Brown and a White wire leading from the furnace which are connected with a wire nut. These wires are connected to a white wire and a black wire which lead to the termostat. I assume the white wire should be connected to the "W" terminal and the black wire should be connected to the "E/AUX" terminal

There is an orange wire which bypasses the furnance and is connected to an orange wire which leads to the thermostat. I assume this should be connected to the "O/B" terminal

There is a yellow wire which bypasses the furnance and is connected to a yellow wire which leads to the thermostat. I assume this should be connected to the "Y" terminal

 

[tgb]

Without being at your house that sounds correct. If the new t-stat has a setup in it you need to be sure you have it set for heat pump with electric backup heat.

 

[nehog]

Looks to me to be option 7, two stage heat. You can ignore the cool side if you don't have an AC attached. You do have fan control as well.

 

[sparelman]

This is a link for the manual for your condenser/outside unit - with a schematic that you can use to check the connection colors for your compressor controls. http://www.dnmech.com/lit/QRP-08.pdf

Also, like others have said make sure you set up the thermostat for your system, otherwise the thermostat will not tell the reversing valve to switch properly when calling for heat or cooling.

you can also call Honeywell, their tech support can be helpful.

 

[JameyB]

It looks like you have a goodman air handler with a heatpump. Use Bottom terminal
guide labeled "heatpump" on tstat NOT the top labeled "conventional".

Red= 24volts, goes to either RC/RH on tstat. Don't remove jumper.

Green= Fan, goes to G on tstat

orange= changeover valve, goes to O/B on tstat (this is labeled W2 at top pay no attention to this)

yellow= Compressor, goes to Y on tstat

Blue( Confirm blue at airhandler)= common , goes to c on tstat (be careful, make sure this wire is not skinned and is firmly installed in the C terminal before power on. It can short out and blow your airhandler fuse if it touches anything but common!

White/Brown= strip heat, goes to Aux/E on tstat ( you can put both brown and white on this terminal. Pay no attention to W2. this is a heatpump)

When programming tstat choose option: #1 Heatpump with auxiliary heat.
#2 "O" cooling changeover valve
#5 Electric furnace

 

[Elizabeth Santisi]

Thanks for the great help everyone! I hooked everything up and attached the thermostat face but it did not power on. It does not require batteries, the furnace door is shut, the fuse is turned on. I've checked the fuses on the furnace and they are on as well. I have a wire tester to check for power and the wires at the thermostat are getting power, they just won't turn the thermostat on.

 

[Elizabeth Santisi]

I think I figured it out! Going to try this tonight

 

[joel63]

Can you make a short jumper wire, about 2 inches long with the ends stripped back 1/4 inch?
Then jump (touch) red to green.
Fan should come on.
That will tell you that part of the system is ok.

That is the first step in running down this problem.

 

[Elizabeth Santisi]

Well, there is no fuse going to my transformer... I will try to jump the red and green to see if there's any power. If not, I'll check to see if there is any voltage coming from the transformer. Any other suggestions? Thanks!

 

[JameyB]

Look on the back of the tstat for a bent pin. If not you might have a blown transformer. Thats the danger of working on HVAC control voltage, its easy to short out and blow a fuse or worse, the transformer. Jumping R to G will let you know.

 

[joel63]

Put your ear on the side of the air handler and listen for a hum or low buzz.
If you hear it then you know that the transformer is working.
Make sure power is on to the unit first.
You really need a multimeter to check to for sure. (24- 28 volts ac)

 

[Elizabeth Santisi]

Jumper didn't turn I'm the fan.

 

[joel63]

Did you listen for a hum at the air handler?
Make sure power to A/H is on.

 

[Elizabeth Santisi]

There is no hum at the a/h.

 

[bazar01]

Try putting batteries on the thermostat. Display should power up even if unplugged from the mounting plate. If it powers up, the transformer is blown.

 

[joel63]

If the power to the A/H is on and you don't hear any hum there's a good chance the transformer is bad.
You need a multimeter to check for sure.

 

[joel63]

Any progress?

 

[gc427]

You need a voltage meter to check for 24 volts coming out of the transformer to know if it's bad.

Also check your control board for a fuse.

Good luck!

 

[Elizabeth Santisi]

Replaced the transformer, still not working...

 

[Bmwsyc]

Do you have 24 volts between terminal "R" and terminal "C" at the thermostat?

 

[Elizabeth Santisi]

No. I think it's time to hire a professional.

 

[joel63]

Please let us know how it turns out.

 

[Elizabeth Santisi]

will do!