Thermostat r and rc jumper

Its role in establishing connections, facilitating signal transmission, and enabling multi-stage coordination underscores its significance in ensuring the efficient and reliable operation of your thermostat and HVAC system. The jumper wire on a thermostat is used to connect the R and Rc terminals, allowing the thermostat to receive power …

If your old thermostat had both R and RH wires, remove metal jumper. Connect the R wire to the RC terminal, and the RH wire to the R terminal. Remove metal jumper connecting R and RC only if you must connect both R and RC. Alternate wiring key (conventional system) 2 3 1 Y2 R M 4 V Y1 RH H F W1 W2 G W Y R RC Y2 W2 G W C YR RC MCR33885 ...For these systems, there is only one 24VAC “R” wire and it can connect to either the RC or RH terminal on the thermostat. The thermostat is supplied with an RC-RH jumper installed. Do not remove the jumper for common transformer HVAC systems. If you have additional wires for 2 stage systems (W2, Y2), Continue wiring as shown.There is a jumper between the R and Rc terminal. When trying to setup my nest thermostat I've put the R wire into both the Rh and Rc terminals on separate occasions, …If you have one R wire, connect it to RH at the iDevices Thermostat and leave the blue jumper in-place to RC. If you have two R wires, connect RC to RC and R/RH to RH and …Why is there a jumper between R and RC on this thermostat? Effectively there isn’t a second RH wire, although there is an RH terminal. However, the heating still needs to be controlled, so a wire known as a jumper is connected between the RC and the RH terminals so that power gets to the heating control part of the thermostat .Thermostat does not work on Heat Pumps with auxiliary/backup heat. W/ Aux Not Used M32714 Remove metal jumper if you have both R and Rc wires. M32732 SCREW INSERT WIRES AND TIGHTEN SCREWS WIRE HOLE LABELED WIRES W G R Not Used Y W. 6 Alternate Wiring If wires will be connected to both R and Rc terminals, remove metalA how-to guide for removing a thermostat jumper wire before installing your Sensi™ smart thermostat.Before you touch any wires, turn off power to your system from your breaker box. If you still don’t see a C-Wire at your thermostat, check out your HVAC’s control board. There should be a C ...

Very useful but I have a problem. My Honeywell thermostat use only w/g/y/r.-There’s a jumper between w/y and Yellow wire goes on Y.-Green wire goes on G-White wire goes on O-There’s a jumper between Rc …Why is there a jumper between R and RC on this thermostat? Effectively there isn’t a second RH wire, although there is an RH terminal. However, the heating still needs to be controlled, so a wire known as a jumper is connected between the RC and the RH terminals so that power gets to the heating control part of the thermostat .The RC terminal supplies the 24-volt cooling power, and the RH terminal is the 24-volt heating power supply. In this article, we’ll look at why most modern thermostats have RC and RH terminals and some (mostly older) thermostats have only one terminal which is marked “R” and how they work.Jan 1, 2014 · For instance with an older type mercury bulb or snap action thermostat and certain digitals, .. when you place a jumper on terminals with the thermostat in the circuit , the voltage can feed back thru the thermostat to energize unexpected items. I have jumped r to y at a furnace and have the condenser as well as heat come on and vice vera. When you have two transformers and connect the Rs you get either 0v or 48v at the other connections - it either doubles or cancels out the standard 24vac. Get a multi-meter and measure before hooking up a Nest E. If 48v then need to swap some wires. Easiest done at one of the transformers. Some freak out at this solution as is easy to make a ... So put your red wire in R. You can plug it into either, nest has an internal jumper. Contact customer service they are really great. You just send them this pic and they will send you a wiring diagram customized for your system. While this is great advice, the OP has a pretty straight forward system. They have a jumper wire connecting Rc to Rh.Leave metal jumper in place, connecting R & Rc terminals. If your old thermostat had both V and VR wires, stop now and contact a qualified contractor for help. If your old thermostat had separate O and B wires, wrap the B wire in electrical tape and do not connect. If your old thermostat had Y1, W1 and W2 wires, stop now and contact aMany modern thermostats have these built in to one terminal on the thermostats (will only show R). All the thermostat does is split the 24v continuous power to RC and RH at there thermostats control board. From Furnace: Connect R to R - If your thermostat has RH and RC you can either keep the jumper in, or attach it to just RH for …

Bypass the safety switch with one hand and, with one or two other hands, touch a jumper wire (a paperclip will do) between the R/W or R/Y terminals on the control. What probably went wrong. To call for fan the thermostat will short R to G. But you had C on the G terminal, so the thermostat shorted R to C.R: This is the power wire for the heating system. It carries 24-volt power from the transformer to the thermostat. Rc: This is the power wire for cooling. Some thermostats have separate Rc and R terminals. In that case you will need to put a jumper between the two terminals and connect them to the R wire.The jumper between Rh and Rc makes total sense, but the blue wire being plugged into Rc does not. If that truly is the same wire from the furnace, it should be in C. On the new thermostat, did you leave the jumper loop in? After that you’ve stumped me and I’d recommend a call to support. They’re pretty sharp and can probably help. Good luck! Do not jumper any R wires! Rh. If you don’t have an Rc wire, Rh serves as both the heating and cooling power wire. If you only have one R wire (That includes R, Rc, and Rh), you’ll insert it into the Rc terminal on your ecobee. With dual-transformer systems you’ll have two R wires—one from the cooling transformer (Rc) and one from the ... Confused about R and RC jumper wire I have a jumper wire on R and Rc. When installing the Nest Thermostat how does this work? Do I just connect the Rc to the nest R and ignore the jumper cable? Locked post. New comments cannot be posted. Share Sort by: Best. Open comment sort options ...Hi everyone. I am trying to install an Amazon Smart Themostat but I’m unsure if the wiring diagram they recommend is correct. I put G, O/B, C in same terminal. Y1 now in Y and RC now in R (as recommended by Amazon). The wire I’m unsure about is the “W” wire. The old thermostat had it in the “W1/E/W3” hole and Amazon says to now put ...

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Thermostat wiring: C low voltage power wire that brings power from heating/cooling equipment to thermostat. RC controls the cooling (at the transformer) has 24V. RH controls the heating (at the transformer) has 24V. G comes from relay that turns on fan. W comes from relay that turns on heating system (at the relay)Insert the jumper loop below the R and Rc terminals if you only have one R or Rc wire. If you have separate R and Rc wires, remove the jumper loop. Connect the wires to the appropriately marked terminals on the wall plate. Attach the thermostat faceplate and turn the power back on. Wiring Details: The thermostat uses 1 wire to control each of ...So put your red wire in R. You can plug it into either, nest has an internal jumper. Contact customer service they are really great. You just send them this pic and they will send you a wiring diagram customized for your system. While this is great advice, the OP has a pretty straight forward system. They have a jumper wire connecting Rc to Rh.RC G W Y 4 R G W Y RH R G W Y M V F H C R5-G 4 Y6 R-G W Y ** * These are four-wire, single-transformer systems. Factory installed jumper wire between the RH and RC terminals must remain in place. Energy Management Recovery (EMR) This thermostat is set to operate with EMR. This causes the thermostat to start the heating or cooling …

Red ( R-wire) The red wire can be Rc or Rh. Rc is power to cool and Rh is power for heating. The R wire can go into either Rc or Rh terminal as there is usually a jumper between the two terminal. Blue ( Common wire) This provides consistent power to the thermostat. Even if your thermostat has batteries, you may need the common wire …I am installing a new hunter 44668 thermostat, replacing a honeywell th5000. the old wiring had R, Y, C, W, and G. the new one has Y1, RH, RC1, RC, Y/O, W/B, and G. any ideas? … read more Rick Mather R in general. R, Rh, and Rc are all the same, but not. In general terms, the R terminal is where you connect the signal voltage source. In low voltage controlled systems, there will be a step down transformer that provides the power to the control circuitry. One of the legs from the secondary of the transformer will be connected to the R ... With the holiday season just around the corner, it’s time to start thinking about festive fashion. One item that has become a staple during Christmas time is the iconic Christmas j...If you have one R wire, connect it to RH at the iDevices Thermostat and leave the blue jumper in-place to RC. If you have two R wires, connect RC to RC and R/RH to RH and …Although the RC Beverage Company does not list specific retailers that sell its RC products, it does offer a service map on its website of its distribution area.Understanding what RC stands for means, you can probably take an educated guess as to the meaning of RH. The "R" still indicates it's a hot wire and terminal connection, and the "H" simply means heating. The RH wire connects to the RH terminal and controls the heating part of the thermostat. Home Hacks & Answers. Home Hacks & Answers.If the black wire on the R terminal goes to the thermostat and only the thermostat, you can safely move it over to the C terminal. The AC and humidistat being hooked up to C is correct. R and C together carry the 24v power that a smart thermostat (and some programmable models) use for power. Right now the thermostat isn't getting …For these systems, there is only one 24VAC “R” wire and it can connect to either the RC or RH terminal on the thermostat. The thermostat is supplied with an RC-RH jumper installed. Do not remove the jumper for common transformer HVAC systems. If you have additional wires for 2 stage systems (W2, Y2), Continue wiring as shown.

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The most common configuration of a 4-wire thermostat is: Red, R wire: This carries the 24V power supply and is responsible for the functioning of the thermostat and communicating with the HVAC system. Insert it into the R or RC terminal. White, W wire: This is the heating wire and signals the heating system. Very useful but I have a problem. My Honeywell thermostat use only w/g/y/r.-There’s a jumper between w/y and Yellow wire goes on Y.-Green wire goes on G-White wire goes on O-There’s a jumper between Rc and R and Red wire goes on R. No wire goes on B or C. The thermostat is Honeywell TH3110D1008 and I would like to use a Nest Thermostat. Hope the picture makes sense. I currently have a Honeywell Thermostat with the following wires hooked up. R, RC, G, Y , W. No jumpers. I have a FirstCO Air Handler, Burnham Heat, and AC unit …Rh or Rc, old system had a jumper. Thermostat. So I just installed the nest learning 3rd generation thermostat. When I took the old thermostat off I noticed the red wire was ran into the Rh slot, but was then jumped over to Rc. When I installed the Nest Learning Thermostat, I noticed that I cannot use a jumper.If labels do not match letters on the thermostat, check “Alternate Wiring” on page 6 and connect to terminal as shown here (see notes, below). Thermostat does not work on Heat Pumps with auxiliary/backup heat. We are here to help. Call 1-800-468-1502 for wiring assistance. W/ Aux Not Used M32714 Remove metal jumper if you have both R and Rc ...Answer. Showing 1-7 of 7 answers. Mine old thermostat had a jumper between RC and RH and the wall wire marked R was connected to these. After mounting the new UWP plate to the wall, be sure that the switch selecting either 1 wire or 2 wire is solidly in the correct position. (1 wire position for mine) Mine looked like it was set to 1 wire, but ...If labels do not match letters on the thermostat, check “Alternate Wiring” on page 6 and connect to terminal as shown here (see notes, below). Thermostat does not work on Heat Pumps with auxiliary/backup heat. W/ Aux Not Used M32714 Remove metal jumper if you have both R and Rc wires. M32732 SCREW INSERT WIRES AND TIGHTEN SCREWS WIRE HOLE ...Nov 14, 2022 ... No heat call in New York Arrived to find Nest thermostat reading NO POWER TO RH WIRE detected. Found failed transformer at air handler.December 13, 2021 at 11:48 PM. Definitive answer: If Rc and Rh (or R) are separate (not shorted with the push up tab) then the common C must come from the AC transformer …

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Confused about R and RC jumper wire I have a jumper wire on R and Rc. When installing the Nest Thermostat how does this work? Do I just connect the Rc to the nest R and ignore the jumper cable? Locked post. New comments cannot be posted. Share Sort by: Best. Open comment sort options ...The temperature reads 74, I turn it down to 68 just to get it to kick on and nothing. I have this little black wire shown in the picture jumping W2 and Y2 (or E and AUX if heat pump). The ecobee book says only worry about wires coming out of the wall, but it also just says “If you have a jumper between R, Rc, Rh”, specifically mentions the ...There is a jumper between the R and Rc terminal. When trying to setup my nest thermostat I've put the R wire into both the Rh and Rc terminals on separate occasions, …R: This is the power wire for the heating system. It carries 24-volt power from the transformer to the thermostat. Rc: This is the power wire for cooling. Some thermostats have separate Rc and R terminals. In that case you will need to put a jumper between the two terminals and connect them to the R wire.Since the installation, my heat (electric) has not kicked on (no issues with the old thermostat). I have double checked and reinstalled the wiring as compared to the first thermostat, removed the R to Rc jumper since it’s not needed, and double/triple checked the breaker. However, I cannot figure out why the heat still does not work. 49. Sort by:Thermostat. C Wire. Adapter. 1. Turn the power off at the. OFF. breaker box or control. switch for your HVAC* system. ON. OFF. Breaker box. Switch. *Heating, ventilation, and …R wire - Power [R+Rc joined by jumper] Y wire - Compressor contactor C wire - 24VAC common O/B wire - Changeover valve G wire - Fan relay. 2H/1C Heat Pump System: NOTE: If dual fuel, TH6320WF (Trade FocusPRO WiFi 6000 only) R wire - Power [R+Rc joined by jumper] Y wire - Compressor contactor C wire - 24VAC common O/B …Connect the New Thermostat. Place the plate of your new thermostat against the wall where it will be located. Check the plate with a level, and mark the screw holes with your pencil. If applicable, drill guide holes before adding anchors to the wall. Pull the wires through the opening of the thermostat’s backplate.I have Rheem rbhc 24, I want to install a new thermostat, my wires on old thermostat as follows: W- white wire RH- Black jumper wire from RC B- no wire RC-Red wire, with black jumper to RH O- no wire … read moreEcobee3 Heating - RC vs RH. Ecobee3 has been working fine this summer for cool. Last night house was down to 60F so I switched to heat. Immediately the fan came on - so I switched it to furnace control rather than thermostat control. But no heat would ever come on. So I switched the red wire from RC to RH - now heat comes on, but A/C no longer ...OLD Thermostat: G – G wire, W – W wire, Y – Y Wire, Rc + Rh (R wire with jumper between Rc and Rh) New Thermostat : needs a C wire. Due to old heater panel, I could not find the C wire to hook up. So, hooked up external transformer and connected to C and Rc. Removed jumper between Rc and Rh as suggested by Bill Lee below. …Insert the jumper loop below the R and Rc terminals if you only have one R or Rc wire. If you have separate R and Rc wires, remove the jumper loop. Connect the wires to the appropriately marked terminals on the wall plate. Attach the thermostat faceplate and turn the power back on. Wiring Details: The thermostat uses 1 wire to control each of ... ….

If you’re in the market for new furniture, RC Willey is a name that should be on your radar. With a wide selection of high-quality pieces for every room in your home, RC Willey has...The RC wire, on the other hand, refers to “red cooling”. It’s the same with the RH wire in that it powers the thermostat. For the RC, it powers the cooling system. How Do the RH and the RC Work? The thermostat that you see on your air conditioning unit is wired to a furnace. This furnace houses the heating and the cooling systems.Cut to today, I installed an Ecobee thermostat. I noted that the Honeywell had an Rc-Rh jumper that the Ecobee instructions told me to discard. We tested both heat and cool and they're both working, but now the outside fan is going on full and is really loud.Sep 9, 2022 ... ... RH and W terminals on a Taco SR503 3 zone circulator switching relay. RH carries 24 volts of power with W is used as the C or common of the ...Kill the power going to the furnace. Disconnect the "to thermostat" wires R and C. Disconnect The other R and C. Wire nut/join the disconnected reds together - do the same for the blues. Red will be connect to R at stat, blue becomes C. Free up the previously un-used thermostat wires. Rh or Rc, old system had a jumper. Thermostat. So I just installed the nest learning 3rd generation thermostat. When I took the old thermostat off I noticed the red wire was ran into the Rh slot, but was then jumped over to Rc. When I installed the Nest Learning Thermostat, I noticed that I cannot use a jumper. Last updated. 2/22/22. The jumper wire can easily be replaced connecting it to the "R" and "RC" terminals on your thermostat wallplate. If you are unable to find the factory …If the black wire on the R terminal goes to the thermostat and only the thermostat, you can safely move it over to the C terminal. The AC and humidistat being hooked up to C is correct. R and C together carry the 24v power that a smart thermostat (and some programmable models) use for power. Right now the thermostat isn't getting …Very useful but I have a problem. My Honeywell thermostat use only w/g/y/r.-There’s a jumper between w/y and Yellow wire goes on Y.-Green wire goes on G-White wire goes on O-There’s a jumper between Rc …The RC wire, on the other hand, refers to “red cooling”. It’s the same with the RH wire in that it powers the thermostat. For the RC, it powers the cooling system. How Do the RH and the RC Work? The thermostat that you see on your air conditioning unit is wired to a furnace. This furnace houses the heating and the cooling systems. Thermostat r and rc jumper, R : RH and RC single power for HEAT and COOL. In most thermostat wiring hookups the red wire is the power source for the system. or V or VR: RC: RC power for COOL (RH not connected to RC, jumper clip removed) RH: RH power for HEAT (RH not connected to RC, jumper, clip removed) or 4: T: T - outdoor temperature sensor : Not used on the 3M-22: V , When it comes to investing in a new jumper, there are countless options available. However, there is something truly special about choosing a British wool jumper. One of the most c..., Use built-in jumper (R Slider Tab) to differentiate between one or two transformer systems. If there is only one R wire, and it is connected to the R, Rc, or RH terminal, set the slider …, R: This is the power wire for the heating system. It carries 24-volt power from the transformer to the thermostat. Rc: This is the power wire for cooling. Some thermostats have separate Rc and R terminals. In that case you will need to put a jumper between the two terminals and connect them to the R wire., Thanks for replying! Unfortunately a two transformer system will have separate Rc and Rh wires along with two C wires back at the two separate relay or control boards (A/C and boiler). "If you have >1 R wire, then R (or Rh) goes to R and Rc goes to Rc." That's not my question. I need to know which of the two C wires to route to the thermostat., If you have RC or RH you want to have a jumper between R and RC, R and RH.R is power and RC means power for cooling. For example, if you don’t have any power going to cooling your AC won’t be turning on. FYI: The furnace control board or fan relay sends 24V up to your thermostat and when your thermostat is calling for cooling or …, May 22, 2017 ... A how-to guide for removing a thermostat jumper wire before installing your Sensi™ smart thermostat ... Thermostat Jumper Wire Between Rh & Rc ..., 35. A thermostat basically just energizes the individual circuits (G (fan), W (heat), Y (cool) ) which in turn (via the furnace controller) powers a relay which provides line voltage to the actual units (like the fan or A/C. In the case of heat, it instructs your furnace to open the valve supplying gas). R (or Rh and Rc) provides the 24VAC power., 1. Reply. RJM_50 • 8 mo. ago. Remove the RH and RC wires, the C and H only designated that power is for Heat or Cooling. You only need a single R power wire, don't care about the 2 different wires. You should rewire it so you have a regular R power wire and use the other wire for a Common wire. -2., 2 Answers. The tech did it right. You have two separate units (Heating and Cooling) Each has its own 24 volt transformer. The Rh is for the heating controls. while the Rc is for the cooling controls. In case you have only one 24 V transformer for both units (rare) ,the Rh+Rc are bridged, so the thermostat can provide 24 V signal to each ..., R wire power from the transformer (put a jumper betwen Rc and Rh if you have only one R wire) If your thermostat has only these four wire, you probably have a first stage air conditioner with a heating system. fig 3. Read also: White Rodgers thermostat wiring. 5 wire emerson thermostat wiring diagram, The thermostat you see on your air conditioning unit is wired to a furnace. This furnace houses the heating and cooling systems. Specific wires connect the thermostat and the heater to operate those systems. This is where you’ll see the RH and the RC wires. Usually, these wires are powered with 24 volts. Even though you won’t get any ..., Nest thermostat connectors are built so that only onewire can be inserted into each connector. Putting more than one wire into a Nest thermostat connector can damage your system and your thermostat. Instead of using jumper wires, Nest Learning Thermostats use an internal jumper between the Rh and Rc … See more, Nov 27, 2021 · The thermostat you see on your air conditioning unit is wired to a furnace. This furnace houses the heating and cooling systems. Specific wires connect the thermostat and the heater to operate those systems. This is where you’ll see the RH and the RC wires. Usually, these wires are powered with 24 volts. Even though you won’t get any ... , R wire power from the transformer (put a jumper betwen Rc and Rh if you have only one R wire) If your thermostat has only these four wire, you probably have a first stage air conditioner with a heating system. fig 3. Read also: White Rodgers thermostat wiring. 5 wire emerson thermostat wiring diagram, The most common wiring for home thermostats is 5-wire, but 6-wire and 7-wire thermostat cables (wires wrapped inside a plastic sheathing) are also possible. In any case, it's ok to have one or more unused wires. For example, you may have a 5-wire cable but only three of the five wires connect to your old thermostat., My old thermostat has G, R, W & Y wires with a jumper between Rc & R. I purchased a Honeywell RTH9585WF Smart Color Thermostat. I moved the G wire to C on the new plate. My furnace has the corresponding wires but there is a black wire in C which was not available at the thermostat plate., Bend the wire into a horseshoe shape. 5. Choose an Equipment Function to Test. Select the function to test by checking the labels on the terminals or consulting the wiring diagram for the thermostat model. Any terminal you use must have a wire attached to it. To test the blower, use the G terminal., Why is there a jumper between R and RC on this thermostat? Effectively there isn’t a second RH wire, although there is an RH terminal. However, the heating still needs to be controlled, so a wire known as a jumper is connected between the RC and the RH terminals so that power gets to the heating control part of the thermostat . , MY OLD Thermostat HAS TWO WIRES ONLY RED AND WHITE BUT HAS A JUMPER WIRE RH TO RC. M Y NEW ONE HAS NO RH. HAS A RC, R, - Answered by a verified HVAC Technician. ... Honeywell RTH6350/RTH6450 and the old thermostat (Carrier) has W O G R C Y connections. this does not match the honeywell model., Hook up the wiring the way you listed it, but leave the jumper between W and Y out. Put the white wire into O on the Ecobee. I've seen these setups many times. leave the jumper out, treat the yellow wire to Y, and the white wire to O/B. report back if its working correctly. The W and Y jumper is there because you do not have auxiliary back up ..., If your old thermostat had both R and RH wires, remove metal jumper. Connect the R wire to the RC terminal, and the RH wire to the R terminal. Remove metal jumper connecting R and RC only if you must connect both R and RC. Alternate wiring key (conventional system) 2 3 1, The old thermostat had a jumper from rh to rc. should I put the jumper back. Contractor's Assistant: I understand that you're asking about the jumper on your Honeywell thermostat. Is that correct? Yes. Contractor's Assistant: Could you please let me know if your new thermostat has separate terminals for RH and RC? It has r and rc …, A jumper cable is just a regular cable. All depends on the type of thermostat you are installing. The jumper between RH and RC is usually needed for traditional and/or basic thermostats. But Nest and Ecobee "Smart" thermostat have that physical jumper built into the software., If you are looking to deepen your faith and gain a deeper understanding of theology, RC Sproul’s audio sermons are an excellent resource. With his insightful teachings and engaging..., Thanks for replying! Unfortunately a two transformer system will have separate Rc and Rh wires along with two C wires back at the two separate relay or control boards (A/C and boiler). "If you have >1 R wire, then R (or Rh) goes to R and Rc goes to Rc." That's not my question. I need to know which of the two C wires to route to the thermostat., How To Help Series: Honeywell Thermostat R and Rc Terminals with Metal Jumper by 2COR4 - YouTube. Travis Martin. 105 subscribers. Subscribed. 56. 16K views 3 years ago. This …, The jumper on your thermostat combines them together since you have 1 hvac system that does heating & cooling. The nestE can only work with 1 hvac system so there is only 1 "R" termimal. So it should work for you, just ignore the jumper and put your Rc wire into the nestE "R" terminal. You also have a Blue wire thats not being used, you can ..., Thermostats may have a jumper switch, metal staple, or plug. The jumper may also be a wire connecting the two terminals. If you have two wires, R or RH go into the R terminal and RC into the RC terminal. If you have more than one wire (for example, you have a wire labeled R and another wire labeled Rc), remove any jumpers between the R and Rc ..., Feb 22, 2022 · What is the R-Slider Tab? Last updated. 2/22/22. This is a built-in jumper switch in case there are two transformer systems. If there is only one R-Wire and it is connected to the R, Rc, or Rh terminal on the old thermostat, set the slider to the up position (1 wire). (Slider will automatically hide Rc position and internally jump R and Rc ... , Sep 9, 2022 ... ... RH and W terminals on a Taco SR503 3 zone circulator switching relay. RH carries 24 volts of power with W is used as the C or common of the ..., Instead of using jumper wires, Nest Learning Thermostats use an internal jumper between the Rh and Rc connectors. A Nest Learning Thermostat will automatically use this internal jumper if your system needs it. Important: Never put more than one wire into a Nest thermostat connector. If your current thermostat has a jumper wire, do not enter it ..., Previous thermostat has C, G, Y, B, Rc, and then a jumper wire from Rc to Rh. The new thermostat has an R and Rc connection, but nothing to Rh. My uneducated brain assumes I can connect the red wire to R on the new thermostat, throw the jumper wire out, and then everything is gonna be fine, but I don't want to do anything harmful before asking ...