Question about Honeywell Electronic Programmable Heat/Cool Thermostat - CT3300A100 Heater

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Hooking up honeywell model th8110

I have a red and white wire coming out of the wall. Which terminals do they hook to on the back side of the unit

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Red to "R" white to "W" assuming you have heat only

Posted on Jan 05, 2009

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1 Answer

Bought new thermostat model ct87k but old Honeywell model I have was hook up by black and white wire not red and white , so how do I hook up.


The two wire Honeywell T87 and CT87 is nothing but a switch in a control circuit. Wire color is not important at all. What is important is the TERMINAL DESIGNATION those wires are hooked to. Soooo....take the wire off of the sub base of the old stat terminal marked 'R' and attach it to the new sub base terminal marked 'R' and so on. Wire COLOR means nothing at all in your case.

Oct 04, 2014 | Honeywell CT87K1004 Round Heat Only...

2 Answers

Wiring with only 2 wires; which terminals to connect?


See RC and RH, RC is for cool, RH is for heat, you wire the red wire to the RH or red terminal ,either one will work actually but we generally switch the hot leg of power, W is the heat circuit


wiring-only-2-wires-terminals-connect-cp4yufdp500qfugpjpa1ch44-2-0.jpg

Dec 12, 2013 | Honeywell Electronic Programmable...

1 Answer

Installed a Honeywell RTH6350D...no heat. I think it has to do with the wiring. Old round unit has red, white, and blue wires. Hooked up red and white but am not sure what to do with blue. Help!


normally there are 4 wires.. should be red to red which is 24 volt
green to g which is fan
white to w which is heat
and the blue could be used on y terminal for cooling
see try that and see if it helps....

Nov 29, 2011 | Honeywell Programmable Thermostat Heater

1 Answer

I would like to know how to connect my central air unit, and heater to the honeywell Heat/cool Thermostat. I have two red wires, a green wire,and a white wire.


Hi,
You have a problem.... two red wires....
The white goes on the "W" terminal
The green goes on the "G" terminal
Now... the red wires...
One goes to the outdoor A/C unit and the other is the power coming from the transformer on the air handler or furnace...
So, you need to figure out which wire has the 24v coming through it and hook that to the "R" terminal...
Then hook the other wire... the one that goes to the Y in the furnace to the "Y" terminal on the t-stat...this will continue on to the outdoor unit....
Becareful... if you hook the red wires up backwards you could blow the transformer or at least the fuse on the board if it has one...

heatman101

Sep 13, 2011 | Honeywell Heat/Cool Thermostat

1 Answer

I would like to know how to wire honeywell dt90e thermostat which wires where i have 5 wires from wall


It helps to know which wires went to the terminals on the old thermostat, if it had one. Otherwise, you would really need to know how they are hooked up inside the furnace/air handler. Some technicians hook them up differently, but I can give you the basics and most commonly used wires. R terminal- red/power wire G terminal- green/ fan wire Y terminal- yellow/ cooling or condenser wire W terminal- white/ heating wire C terminal- blue/black/ common or ground wire If you have a rc/rh terminal, they are usually jumpered with a small wire and your power wire still hooks to that. Hope this helps and good luck!

Jun 25, 2011 | Honeywell Heat/Cool Thermostat

1 Answer

How do u wire athermostat to the furnance and ac unit on model e3eb-015h nordyne


You need to get low voltage wire known as 5 wire. run wires thru wall to stat and furnace Red wire goes to R terminal white to W terminal Green to G terminal Yellow to Y terminal on both the stat and furnace circuit board. Now you need a wire called 2 wire low voltage wire run that from furnace circuit board to outside A/C. At furnace hook red wire to Y terminal and white to C terminal doesnt matter which ones you hook up at outside unit. Do it just like i told you this will work properly.
If this helps please rate me.

May 20, 2011 | Heating & Cooling

1 Answer

I need the wiring diagram for this thermostat, there are four wires that are hooked up red,white,blue for yellow and green. They connect to a honeywell relay that has five connection, y,g,w,c,and r, do i...


On the fan relay hook up the red to r terminal the white to the w terminal and the green to the g terminal , now the blue needs to hook up to one of the two wires going to the outside condenser unit and the other going there goes on the c terminal . The blue does not have to go on the honeywell rrelay just wire nut it to the wire.

May 13, 2011 | Carrier TSTATHCP Programmable Thermostat...

1 Answer

Hi! We have a really old williamson thermostat (not sure about the model but it says t87fi89i 2 8047 [dont know if it's i or 1 either]). We want to replace it with a honeywell t87n east-to-see thermostat....


On most applications for heating the red and white wires are used,however I would check what wires are connected to terminals on old thermostat. These connectons should be labled with initial of wire color,such as R,W,G,Y or Rc. If your green wire is hooked to R or whatever just hook new thermostat up like the old one and you should be ok. Hope this helps. Thanks.

Nov 12, 2010 | Honeywell Electronic Programmable...

1 Answer

Trying to install a Honeywell RTH6400 but I only have a white and a black wire coming out of the wall.


Hi,
Hook the black wire to the "R" terminal and the white wire to the "W" terminal...
That's all you have to do... then program the t-stat...

heatman101

Oct 14, 2010 | Honeywell FF12HH Thermostat

2 Answers

Wiring instructions for Thermostat Honeywell with Carrier Package


Jumper R to Rc and hook hot wire from transformer to R usually red wire
O = Reversing valve probably white or orange If you get heat when calling for cool or Vice Versa then switch wire from O to the B terminal.
Y = Contactor usually yellow
G = Blower usally green
Jumper Aux to E need to go to unit and use the wire that goes to your Auxiliary or 2nd stage heat
L = Light if you have this terminal on your unit then hook it up.
C = Common from transformer usually black, if you have this terminal on your unit hook this wire up.
Make sure you go to your unit and only hook these wires up if they go to these locations.

Jan 11, 2010 | Heating & Cooling

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