R - Red Wire. Your Nest thermostat should automatically turn on once it’s connected to your system and your system is powered up. I would say there “appears” to be quite a bit of confusion surrounding how you work out if a thermostat is compatible with your current HVAC system. Dark blue wires connect to the B terminal, found in heat pumps, although this may be an orange wire connecting to the O terminal in some makes. Thermostat Wiring and Wire Color Chart. OLD THERMOSTAT WAS CONNECTED AS FOLLOWED S1 - S2 - O / W2 / B - ORANGE WIRE R - RED WIRE C - BLUE WIRE There is an orange wire in the old thermostat, but not in the new one. O - Orange wire. The one I’m installing is the T9 smart thermostat. I am trying to connect a HONEYWELL RTH2300B On the pictures you can see the old way it was wired and the connectors I have on the new thermostat. The device is relatively inexpensive, and it’s easy to install. C - Blue Wire. • If there’s a white wire in the connector labeled both W and O/B, then you probably don’t have a heat pump. The current one is trans about 2 years old. ** The common wire could be labeled "C" on your old thermostat, or it could be labeled "B" or "X". Insert the wire with the color orange into the the “B” terminal with with the needle nose pliers.Use the slotted screwdriver in order to tighten the screws . C - Brown Wire . Venstar Add-A-Wire Adapter. R Wire Designation and Terminal - The R wire is is the 24 volt hot originating from the 24-volt control transformer.That is the power to energize the control relays and contactors in your system. W1 - White wire. • If there’s an orange wire in the connector labeled both W and O/B, then you likely have a heat pump. Also on my OLD thermostat I don't see that JUMPER WIRE on there if that means anything. (Heat) So, EXPAND, if you must, and use one of these free wires as the C wire. Is this older base not compatible with new system? Each wire in the thermostat cable serves a different purpose. For all other t-stat terminals, and in fact, sometimes even for the above mentioned common color assignments, the exact purpose of a wire is often not clear. The thermostat is simply a switch, and the power originates from the transformer through this terminal. On the old thermostat, the orange wire went to the “Y” terminal. There are 4 wires coming out of the wall – Green, White, Orange and Blue. GDA622**S GDA622**S (GDA622--S) Analog Output Module, 2 channels, 1-5V, 4-20 mA output, 12 $760.00: MDR-40-12 MDR-40-12 12Vdc 3.33A Din Rail Power supply R - Red wire. The “18” refers to the gauge and the “5” refers to how many individual wires are inside the cable. Another Green wire is connected to the screw in the middle between the O and C, I am guessing is ground? Y1 - Yellow wire. Contractor's Assistant: How long has this been going on with your thermostat? T9 Smart Thermostat with Sensor WiFi Water Leak & Freeze Detector View All Products View Pro Install Products View DIY Install Products tags may be wrong. G terminal will use the green wire. OB - X. Rc - X. W1 - White wire. my new thermostat Honeywell rth3100c has e aux y g o l r b and c how do I wire … How old is it? There are a variety of thermostat wire types. If you see a blinking red light at the top of your Nest thermostat’s display, you’ll need to wait until the battery is charged before you can use it. (Fan) Y terminal will use the yellow wire. The thermostat will think it has a C-Wire connected even though it doesn’t. So I did the same with the new thermostat. Before you start troubleshooting your Nest thermostat. IF YOUR SYSTEM INCLUDES A GAS FURNACE, THE WIRING WILL BE SEPARATE FROM THE 3 OR 7 CONDUCTOR CABLE. • Connect the orange wire from the SZLCD thermostat COMMS terminal to the orange wire that runs from the SZLCD control relay box. In most thermostat wiring hookups the orange wire is used to control a reversing valve - switching from heating to cooling mode or vice-versa. The previous thermostat before the existing Hunter was a very old Honeywell unit from 1992 which is where I got all the wiring names/tags from originally. Y – Compressor Stage 1 (Cooling) (Air conditioner) W terminal will use the white wire. Y - Yellow Wire. Thermostat wire is just a big spool of bundled, color-coded wires. Am I compatible with ecobee? Venstar makes their own version of a power extender kit. In heat pump system, there are at least 8 wires that need to be connected to the Heat pump thermostat wiring - A typical wire color and terminal diagram. The thermostat uses 1 wire to control each of your HVAC system’s primary functions, such as heating, cooling, fan, etc. See the picture above that shows a common seven wire thermostat cable. If you really want to skip the C wire installation, a smart thermostat without the common wire (ecobee3 is a good example) is your best bet. Room thermostat installation & wiring guide: this article series explains the basics of wiring connections at the thermostat for heating, heat pump, or air conditioning systems. * If the old thermostat has separate RC and RH wires coming out of the wall, clip the RC/RH jumper on the back of the thermostat above the battery compartment. In talking to the AC guys here, the orange wire that is wired to U1, is connected to the BK post on my furnace. The thermostat uses the low voltage wires to send an electrical signal to the furnace or boiler, which is a way of providing commands to turn the heat or air conditioning on and off. Most brands use the O pump, as this connects to a valve used to trigger cooling. Again, the W2/E etc. However, the fact is there IS a lot of confusion. For the old thermostat, the blue wire went to “RH” and there was a red jumper from RH to RC. If you have heat and AC, you’ll need 18/5. It's there so you can supply power to the heating and cooling switches with a single wire, which is usually red. This article gives a table showing the proper wire connections for the American Standard, GE or Trane room thermostat used to control heating or air conditioning equipment. The Venstar Add-a-Wire is an inexpensive adapter that turns a four-wire system into a five-wire system.. One more alternative: get a smart thermostat that’s designed to work with systems lacking a C-wire.Check out the ecobee line of thermostats – all ecobees ship with an adapter for C-wireless systems. THEREFORE … Should I put the Brown into the W1, and not connect the white? Often, installers use a cable with extra free wires to permit easy expansion later. NEW Thermostat (NORTEK GoControl Model BRO-NTBZ48): Instructions Say: New – Old – My wire color Y1 – Y – Yellow G – G – Green R – R – Red C – C – Blue W1 – W – White O – O or B – Orange. This comes from the transformer usually located in the air handler for split systems but you may find the transformer in the condensing unit. Warning. My question is where does the Brown – E wire go? Wire colors can vary, but: • Common or C wires are generally blue. my old thermostat had a wiring as such o/w2 orange r red y/y2 yellow g green c black w/w1 white . G - Green wire. It is true that an 18/3 wire is enough for a heating unit, but 18/5 is still recommended. Just moved, and new thermostat system has 7 wires: W2 - White Wire. To find an unused wire, look at the wire layout at your thermostat wall plate. acetc Posts: 1,004, Reputation: 79. Thermostat Wires Color Coding. Contractor's Assistant: What's the brand and model of your thermostat? Thermostat wire comes in various weights. 4.) O – Orange Wire. What is the proper wiring for this. W2 - … E - Brown Wire. The wiring for your Honeywell thermostat depends on the functions of your heating and cooling system. See (B and O) above: R : RH and RC single power for HEAT and COOL. However, the wiring is a bit different. I am installing a honeywell pro thermostat to a rheem ac\heatpump unit need wiring info for orange and white schematron.org thermostat orange . In most thermostat wiring hookups the red wire is the power source for the system. The most common is 18/5 (5 strand, 18 gauge). Please refer to the owner's manual of your old thermostat … Nest Thermostat: Y1 - Yellow wire. Wall plate for a 4 wire smart thermostat installation. See the diagram below for what each wire controls on your system: S – Indoor and Outdoor Wired Sensors. It allows you to connect a smart thermostat to the existing wiring configuration without a C-Wire. Types of Thermostat Wire. O = Orange wire W2 = White wire E = Black wire R = Red wire Y1 = Yellow wire. Hi, A little confused. 3-wire heat-only thermostat (R, G, W) Installing your ecobee with a boiler and AC (dual transformer system) ecobee thermostat installation with an isolation relay; ecobee3 lite with 4-wire hot water zone valves; ecobee3 lite with 3-wire … You'll probably see a thermostat jumper wire connecting the Rc and Rh terminals. Is the orange wire for power (which I wouldn't need for the new battery-powered thermostats)? Hello I’m working my new thermostat on and I have a orange and blue wire. Installing Common Wire Maker Kit If there is not an extra unused wire running from the thermostat to the furnace, and using the g-wire as a common wire is not an option, in most cases, installing a Common Wire Maker Kit is the best solution. Choose an 18/5 C wire for the installation, irrespective of whether you have a HVAC system or just a heating unit. Put this wire in the Nest Thermostat’s * O/B connector. My thermostat has only two wires. O/B - Orange Wire. This one uses the green wire as the C wire instead of the G (fan) wire. – … The main difference setting each apart is the number of colored wires. G - Green Wire. C terminal will use the blue or black wire (Common wire, It enables the continuous flow of 24 v AC from the Red wire.) Y2 - X. G - Green wire. This is the terminal that actually gets connected to the primary heating stage and turns on the outside unit’s reversing valve on. Is My Thermostat Compatible with My HVAC System I suspect a lot of you will be interested in reading this page. Thermostat Terminal Designation: Color of Wire and Termination*: R - The R terminal is the power for the thermostat. HVAC systems with more functions need more wires to communicate to and from the thermostat. Rc and RH terminals wall – Green, White, orange and wire. 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