Question about Honeywell Programmable Thermostat Heater

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RTH6400 Honeywell - where does the blue wire go. There is also a yellow wire. How do I connect the red wire when there is a wire clip going in the place marked R & RC???

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It all depends how things are wired inside your furnace downstairs on a basic system blue is usually a common - C and yellow is for cool - Y just leave the jumper in from R & RC R is 24v power and RC is 24v power in Cool yuo will just have to squeeze the new wire in with it before you get to far i would open up the doors on you furnace and see where the connections are in there so you dont blow any fuses

Posted on Jun 28, 2009

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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...

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Need help wiring a thermostat with 5 wires don't know what rh and rc mean.and how they connect. thanks


Hi, on a thermostat like you have, the RC and Rh have a jumper wire that connect the two using the red -hot wire coming in. This means R-cooling and R-Heating. So, take the red and connect to either one, and make sure you use a jumper wire to connect rc and rh together along with the red wire coming in. Yellow will go to Y for cooling, W for heating, and G,green for the fan. If you have a blue wire left over, it is a spare, unless you have no yellow. If it doesn't have a yellow, use the blue wire for cooling. Some contractors will use blue instead of yellow. If not, the blue is a spare wire.
Shastalaker7
A/C, Heating Contractor

Apr 10, 2011 | Honeywell Heating & Cooling

1 Answer

Wiring with Honeywell RTH6400


I have the same problem. I am Trying to install a Honeywell RTH6400 but I only have a white and a black wire coming out of the wall. Do I have the wrong thermostat. The manual doesn't explain this siutation.

Thanks!

Dec 29, 2009 | Honeywell FF12HH Thermostat

1 Answer

I am tying to install an RTH6400 5 in 1 thermostat but the colors of wires i have on my wall are RED, GREEN, BLUE AND BLACK, where as the book has RED , YELLOW,WHITE AND BLUE. please which do i connect to...


You need to open up the panel at your furnace(air handler) and find the terminal strip and see what your existing thermostat wires are connected to. Normally your red wire connects to the R terminal(24 volts), the yellow wire to the Y1 terminal(cooling), the white wire to the W1 terminal(heating), the green wire to the G terminal(indoor fan). You can use whatever color of wire you have existing, just make sure that the R,W1,Y1,and G wires at the furnace match the R,W1,Y1, and G terminal screws at the thermostat. Also make sure the power to the furnace(air handler) is turned off before you make any wiring connections at the thermostat or furnace.This is very important! If you don't and you short any wires to ground(especially the R wire) you will possibly ruin the system step down transformer or blow the low voltage fuse.

Nov 10, 2009 | Honeywell Electronic Programmable...

1 Answer

I'm installing a Honeywell RTH7600B programmable thermostat and replacing a Honeywell T87F2873. The new one calls for a Red, Green, White, and Yellow wire, while I only have a Red, Green White and Blue....


Every thing the same except take your blue wire and replace the yellow for it. So when you hook it to t-stat goes like this

Red to R
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Jan 16, 2009 | Heating & Cooling

1 Answer

Manual Thermostat replcaement with Programmable Digital unit.


Hopefully there are markings on the old t-stat as to what terminal is what.
on the honeywell 8000 use the heat pump labeling and then the standard wiring would be
R- red
AUX-white
Y- yellow
B- O/B
C- black
G- green
There should not be a bare wire, it probably just has the insulation stripped back way too far.
You should probably open the furnace and compare the terminal label in the furnace to the wire color. normally yellow and blue pass through the furnace and are wire nutted to wires going to the outdoor unit. In the furnace the white wire will connect to the w or w1 terminal. also, you will need to set the Honeywell stat to have the following parameters.
170-7
190-1
200-0
other parameters that I did not specify, you may read the manual and make your own decision but I recommend factory settings for the other parameters

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What is the blue hooked up to now?

Jun 07, 2008 | Honeywell Electronic Programmable...

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rh and rc should have a jumper between them.connect red to either.y=yellow g=green w=white and do not use the blue.your new stat will run on batteries.

May 26, 2008 | Honeywell Power Humidifier: Furnace...

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