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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

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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

Posted on Apr 10, 2011

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I have 4 wires green blue red and white my red is connected to the rh rc with jumper green connect to g blue to y1 and white is connected to w1 my new thermostat has no rc rh or a jumper


Paulette, if your new thermostat has no Rc and Rh thats fine. The Red wire should simply go to the R terminal. The Rc and Rh terminals on the old one was for the old 'two transformer' systems. The vast majority of systems now have no need for the Rc Rh terminal and jumper. The rest of your wires connect as on the old stat also.

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1 Answer

I am wiring a Honeywell wifi unit and I used a separate 24v transformer and connected to the c and rc terminal. My system is ac and heat and uses both and rc and rh wire. I wired the rc to the r ter


A thermostat is a switch. It connects 24vac from one terminal to another depending on the request. The 24vac comes from a transformer, usually located in the furnace and connects to the R terminal. Since you are using RH and RC without a jumper between it means there are two transformers, one in the furnace for heating (RH) and one in the air conditioner condenser used for cooling (RC).
Your old thermostat was probably mechanical and did not have a C (24vac common) terminal. Your new thermostat requires power to operate therefore needs a wire connected to a C terminal. I would get rid of the transformer you added and look for an unused wire in the bunch at the thermostat. If it's there connect it to C on the thermostat and to C on the furnace. Remove any jumper from R to RC or from RH to RC depending on your thermostat and connect wires same as the old thermostat.

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1 Answer

I want to put in a new thermostat but I do not know how to connect the Rh wire with jumper to Rc wire to new thermostat! it only has labels for O/B Y R G W . no hook up for the Rc OR Rh


This means that the new tstat does not require RC to RH jumper. Some TSTATs to and others don't. Leave the jumper off and do not worry about it as the board in the tstat automatically controls this aspects of the unit.
Hope this helps. Please leave feedback...

Jan 28, 2011 | Heating & Cooling

1 Answer

I bought a honerwell regular digital thermostat and changed it trying to follow directions the 4 (four) wires coming out ofn wall and that were connected to old thermo were red, black, yellow and white. ...


Wiring color to Thermostat Depending on what thermostat youhave and existing wires. Typically red and white are for heat and yellow andgreen are for cooling. On base of thermostat there should be initials stampedto identify wires by color. R. W. Y. G. Possible Rc. and Rh if so for most usesyou need to jumper these two together. You may have a blue wire instead ofyellow or green. If so just hook blue to y or g. Hope this helps you. Thanks.

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1 Answer

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you have to go down to your furnace and follow the thermostat wire ...it connects to a terminal strip or fan centre...the color doesn;t really matter...installers mix and match all the time....look at the furnace wiring and mark it down...Red on "R"...Green on "Y" whatever it is...and connect it accordingly upstairs...if you only have 4 thermostat wires downstairs you will need a jumper wire between RH and RC...if you have 5 wires you will see 2 wires on "R" at the furnace.,...and connect either to RH and RC at the thermostat
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The best way is to see where the wires are connected at the furnace and duplicate them at the thermostat but typically the connections are:
Red wire to "RC and RH"
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1 Answer

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