Does it matter if you connect to the Rh or Rc? If connecting to the C supplies the power to the thermostat, what does the other wire accomplish?
771293
Ground!Be sure that your unit doesn't have a low voltage circuit that's available. Perhaps you'll have to run additional wire to the thermostat from the unit, but the extra unit may not be necessary, I was happily using it as directed until discovering that voltage was already on my furnace.Pays to check.Dee
771294
So my current setup had the Rc wire in, no Rh, so initially I plugged one of the lines from the transformer to C and another to Rh and only my AC would work, not heating. Remember that by just pluggin one lead to C you do not complete the circuit for 24v to flow through the nest and give it power. If you have the same setup as I do, just follow my instructions to connect the power supply to give the nest the 24v on the C connection
1264980
I suggest you download the manual and wire it per the instructions in the manual. Important! The Wi-Fi thermostat requires a C wire to operate. The C, or common, wire brings 24 VAC power to the thermostat. Many older mechanical or battery operated thermostats do not require a C wire. If you don't have a C wire, try: * Looking for an unused wire that is pushed into the wall. Connect that wire to C and check that it is connected to the 24 VAC common at your heating/cooling system. Note: Not all heating/cooling systems label the 24 VAC common C. Check your system manual or contact the manufacturer to find out which terminal is the 24 VAC common. Or, call a qualify service company and have them solve the problem.
1279358
Depends on your system. The manual states that this thermostat is for two wire systems (not counting a C or C1 wire). This does not work for 3 wire systems and list an 800 number for Honeywell Customer Service to call and check. I would list the number but Amazon would likely delete it.
1264983
I suggest you download the manual and wire it per the instructions in the manual. Important! The Wi-Fi thermostat requires a C wire to operate. The C, or common, wirebrings 24 VAC power to the thermostat. Many older mechanical or battery operatedthermostats do not require a C wire. If you don't have a C wire, try:* Looking for an unused wire that is pushed into the wall. Connect that wire to C andcheck that it is connected to the 24 VAC common at your heating/cooling system.Note: Not all heating/cooling systems label the 24 VAC common C. Check your systemmanual or contact the manufacturer to find out which terminal is the 24 VAC common.Or, call a qualify service company and have them solve the problem. I suggest you download the manual and wire it per the instructions in the manual. Important! The Wi-Fi thermostat requires a C wire to operate. The C, or common, wirebrings 24 VAC power to the thermostat. Many older mechanical or battery operatedthermostats do not require a C wire. If you don't have a C wire, try:* Looking for an unused wire that is pushed into the wall. Connect that wire to C andcheck that it is connected to the 24 VAC common at your heating/cooling system.Note: Not all heating/cooling systems label the 24 VAC common C. Check your... » Read More I suggest you download the manual and wire it per the instructions in the manual. Important! The Wi-Fi thermostat requires a C wire to operate. The C, or common, wirebrings 24 VAC power to the thermostat. Many older mechanical or battery operatedthermostats do not require a C wire. If you don't have a C wire, try:* Looking for an unused wire that is pushed into the wall. Connect that wire to C andcheck that it is connected to the 24 VAC common at your heating/cooling system.Note: Not all heating/cooling systems label the 24 VAC common C. Check your systemmanual or contact the manufacturer to find out which terminal is the 24 VAC common.Or, call a qualify service company and have them solve the problem. « Show Less
1066007
You must supply power to the thermostat. In my case, more wires ran between the furnace and the thermostat than were actually used on either end. I just had to figure out where to connect one of the extra wires on the furnace side, to supply the power to the thermostat.
918901
You need 5 wires for this, but have options. First, I'd pull the thermostat and check the cable closely. There may be a 5th wire in the cable (not used on your old thermostat) that's been cut off or pushed back into the wall. If not, you can use the "Venstar Add-A-Wire 5 Wire to 4 Wire Adapter" to avoid having to replace the cable. You can download the manual to check color code and compatibility with your unit.
1961641
The C wire provides the power for the thermostat. The batteries in the unit are only for backup purpose when your power goes out. You need to get new wiring put in from your unit to the thermostat location with a C wire.
1318957
It has a battery for memory back up, but it runs off the C wire. Be sure your thermostat setup has a C wire.
1201133
Mine is hooked up as Heat only So I only have two wires as well. If yours is the same you would hook up to C and Rc. After you do that go to where your relay for the circulator is and make sure it is not chattering (rapidly opening and closing). Good luck
652885
not one person knows what they are talking about on this. R and C stand for Red and Common on the stat. this is the low voltage power from the furnace, boiler, Heat pump or geothermal unit. This is where the stat gets its power from. Green is the fan control. Yellow is for A/C control. White is for the heating side of the stat.The only way a Thermostat has external power is through batteries. this stat works off the units power source. it will back up itself when the power is down. so if your power go
1294739
For a WiFi thermostat, the 24v pair of wires connect to C and RH (or R) according to this video.http://www.youtube.com/watch?v=8a_f2_iAW1U
253814
Your power source is integrated into your thermostat wire. Its not a separate power source. Most HVAC systems have a 24v power integrated. The battery is just a back up and to keep your settings.
1916110
I don't know a specific answer to your question, however when I was installing mine, I had a wire that I didn't know what to do with. I contacted RCS (check their web site) and received prompt and courteous support. My thermostat works great!
430751
Most, if not all, of the thermostats you will encounter have been color coded for commonality. So yes, you should use the RWGY terminals. If it is at all possible, try to verify what those original wires are for. For example, the G wire might be for the fan. Is there anything in the manual that says the G terminal is for the fan? If so, this is the correct terminal.Good luck and enjoy saving $$ with the new timer system!(I apologize for taking so long for this response)
1370894
i wired mine as follows:1&2 = load know that 1 & 2 connect to a single wire of the heat/cold source. only one wire from heat will connect to 1 & 2. u only cut one wire of the load(heat supply) and connect to 1 & 2. 3&4 = power5&6 = sensorworx4me, lucku u
98784
These units connect directly to the line voltage.. If your current thermostats only connect via romex type wire then these will work. If your current thermo has low voltage wiring (thin wires) then they will not work.
543760
I believe so, you may have some extra wires from the new thermostat but your rv wires should be color coded to match the new wires on the new thermostat. I had a similar situation and i just capped off the wires i didn't use.