Guide to using a Nest or other Low Voltage Thermostat with a switching relay to replace a line voltage 120V or 240V room thermostat for electric heat, fan heaters, radiant floor heat, convector heaters. Too many stages of cooling or heating. High-voltage wires If your thermostat is labeled 120V or 240V, or has thick wires with wire nuts, or has L1 and L2 terminal blocks, your system . Do a FACTORY RESET of the Nest when you are on the new router. View the tech specs for Nest Thermostat E to learn about specifications, installation, and more. Most smart thermostats are compatible with the most common home heating systems. It may work fine on a Nest since those gradually charge a permanent battery. It requires converting the 24VAC control voltage from the Nest to 12VDC to allow proper isolation of relays, but would basically duplicate the relays on the existing control board. You will simply connect the line and load of the wall thermostat to the wires in the box going to the heater. Most people are familiar with thermostats for heating and cooling. If your thermostat has 2-4 thick wires, usually with red-black-white combinations you likely have a line voltage heating system (Such as a baseboard, in-floor, ceiling or electric space heater). You can harm yourself and cause damage to the connected equipment. They work with all common fuel types including natural gas, oil, and electricity. A lot of energy is spent on air-conditioning empty houses, Auto-away is the solution for this. The UK version of the NEST comes with a HEATLINK which the Thermostat connects to via terminals T1 and T2. Then the 2- 10 gauge (line voltage) wires from the original thermostat are connected to 2- 18 gauge (thinner)pigtail wires with wire nuts. My advice is if you are uncertain or do not understand the electrics then pay for a Professional to fit it for you then youll be 100% safe. Nest Thermostat High Voltage Hack | Installation [High Voltage Conversion] I am a licensed electrician that specializes in commercial building automation, lighting controls, fire alarm and security systems. Suburban 161154 Wall Thermostat 4. Nest products are the go-to thermostats for those that want to balance affordability and appearance. Find your transformer in your RTU unit. But when the Nest called for heat, the Aube transformer made a clicking and buzzing sound that definitely sounded wrong. How To Wire A Thermostat To A Baseboard Heater For Line Voltage Single Pole Most single pole line voltage thermostats should be mounted at a height of 60 inches on the wall. Dec 5, 2013: I have determined that my NEST unit does not like having a static IP assigned to it. Hi, the wiring needed for the nest thermostat is low voltage which it uses to charge its internal battery. Click for Information. RH-Wire - connects to RH terminal RH heat. Posts . Honeywell 1 Week Programmable Thermostat 7. Here is a diagram you will be able to use. It works with the 3rd-gen Nest Learning Thermostat, Nest Thermostat E, and the new $129 Nest Thermostat . Huh? Turn off the A/C when off-grid if the battery State of Charge drops below X%. Automatically switch to "auto" mode when we're connected to shore power. Step 2a- I put holes in the 2G cover plate to match the wall plate adapter. Nest thermostats are compatible with a wide range of HVAC systems, especially the Nest 3rd Generation Learning Thermostat. Now they will fit into the back of the Nest. 20VA Transformer 2. Honeywell TH5110D1006 Non-Programmable Thermostat 2. Emerson 1E78-140 Non-Programmable Heat Only Thermostat 5. Repost: How To: Install Nest Thermostat with Line (High) Voltage. Then I tried this: Aube Wall Black Black White White Red Capped off, disconnected The Nest self learning thermostat has a combination of sensors called Nest Sense which can detect whether you are home or not. (opens in new tab) Comments (16) In this video I remove some of the basement walls. 0. . And the red LED light on the Aube that signals when it is activating the 120v side would flicker on and off. You can't use a low voltage thermostat (like Nest, Ecobee or other popular models used for furnaces or heat pumps) with a baseboard heater. For the new thermostat to work, you need a 24 volt common to complete the circuit with the 24-volt hot wire to provide power for the thermostat because it is a state-of-the-art digital programmable wi-fi thermostat it will need 24-volt power to work. . Thermostat Terminal Designations Quick Guide - Detail Wiring Color Guide Below. Here we also provide copies of Aube Technologies line-voltage thermostats used for electric heater control, along with company contact information. Y-Wire - connects to the Y terminal and is for cooling stage 1 with the yellow wire. and 3. on how to install a Nest thermostat when you have line voltage and baseboard electric heat in home improvement, instead of directly into the Nest subreddit. a max current rating contact) systems. High voltage thermostats convert your home's incoming current (240v or 120v) into usable heat. Line Voltage Thermostats A line voltage thermostat ranges from 120 to 240 volts. Just press down these buttons and then insert the labeled wires into the corresponding ports. Learn more. . Over half of the electricity demand in the United States involves thermostatically controlled loads. The best way to use a swamp cooler is to open windows in the rooms that need the cooling the most. Don't rush into this. Above: A typical high-voltage thermostat with 2-4 black and red wires. The two main types of thermostats are line voltage, also known as high voltage, and low voltage. Connect the control circuit Cool to warm sliding thermostat knob Typical high voltage thermostat still being installed in hotels 120/240/277 volt Six wires: 3 for fan - black, yellow, blue 1 for heat - brown . A relay is a switch that is controlled by a signal. And to my great surprise . Absolute Electrical. Similarly, this thermostat won't work with high-impedance systems and may not work with systems that are based on microcontrollers. So if that CG relay was trying to pull 15A, that was likely the problem. Consider consulting a qualified electrician to assure your safety. Tune in to our live event on 10/6 at 10am ET. They can assist in converting the high voltage system to a low voltage system that will work with your Nest thermostat. You would love to have the Nest thermostat but you have line voltage heaters? Yes, it is easy to control a swamp cooler with any thermostat. 6. Thermostats are high on that list. Above: A typical low-voltage thermostat, with multiple small wires in different colors. I highly, highly, recommend a relay. It offers more control and convenience as compared to other thermostats. It's just a contact that's either open or closed. 3-stage cooling: The second generation Nest thermostat only works with HVAC systems that have one-stage and two-stage cooling. A Low Voltage Thermostats operate on 24 volts of electricity using a step-down transformer that reduces the incoming 120V line voltage to a level between 12V and 24V. The Nest thermostat will have G, OB, W, Y. work. And with these product reviews, you'll start to understand what you're looking for in an RV thermostat. View Deal. Under the hood, they're normally bigger in size than thermostats with low voltage. There are several ways to determine which one your thermostat is. Take the blue wire straight to the transformer for common on LOW VOLTAGE side, two wires RED and YELLOW in color or BLUE and YELLOW, not sure what colors you have; one should go from RED off TRANSFORMER to R terminal that power the other will be common. The Nest Thermostat can be powered by low voltage wires from the Heat . 1. Also given the pictures and the info provided am I ok to do the conversion with: 1. Subscriptions. If it reads something like "110 VAC", "115 VAC", or "120 VAC", then you have a high-voltage system and the Nest won't work. rise NTC resistance drop, therefore, Vn voltage rises and when Vn Vp1 the opamp will change his output state (from high to low). Well now you can control your 240V heaters with this solution and get control . Get the scoop on the newest products. If your system is a proprietary system, it may not work with a Nest thermostat. ICM Controls SC1600L Non-Programmable Heat Only Thermostat 8. Most people don't use the "fan only" mode, so while you'd give up control over the fan in the system, you'd gain constant power to the smart thermostat. Voltage measured between Rc and C (Power and AC Common) 27.68Vac. RMerlin: AX86U- 386.7_2 // AX58 -386.5_2 // AC68 - 386.5_2. Skip Navigation. So the fact that your thermostat is capable of controlling 120V doesn't mean that it is. I did it in time lapse on my I-Pod. $189.00. Upvote #3 03-04-19, 07:46 PM Houston204. Above: A typical low-voltage thermostat, with multiple small wires in different colors. They are powered and operate at 120V-240V on average. Heat pumps that use Service light (L) wires: L wires are usually used in showing the system's status. I don't know if I needed the "horizontal" holes cut but it could't hurt Most line voltage thermostats usually have single pole wiring or double pole wiring which depends on features that heater and thermostat have: Single Pole Thermostat Single Current It causes issues with the Nest thermostat's operation. 18/5 wire is simply a bundle of five colored, 18 AWG wires. Settings. An alternative to Option 1 is to run completely new 18/5 wire from your furnace to your new thermostat. . A value between 100 and 250 VAC, which stands for Voltage Alternating Current, is a high voltage system. Connect the wires to the Nest Thermostat. A high voltage thermostat should be used for the following type of heating systems. This option is to control the 120VAC fan and damper control wires via relays directly. You need to confirm that the thermostat is actually switching 120vac. Check battery voltage in Nest: must be above 3.6v (in good state 3.9v) Check lin voltage: should be 200mA if C wire is applying proper voltage. You'll also have to change the wire at the furnace from G to C. 5. The Nest thermostat is designed to work primarily with low-voltage systems. 12V power to thermostat Call-for-heat Common Satisfied (optional) 230V AC live and neutral input power Thermostat Install Heat Link 5. Dometic D3106995.032 Heat/Cool Analog Thermostat. Image from Nest.com. Thermostats are available in three basic types: manual, . Buy on Amazon: 7: 24 Volt .. As mentioned earlier, if you have a multi-zone or dual-fuel heating system, you'll probably need multiple Nest thermostats. Google Nest Thermostat Snow . I thought this might be due to voltage sag due to impedance on the 120 volt supply line. Every home's . Based on the function of each of the original line voltage wires, the two (now smaller gauge) wires will be connected to the proper terminals of the Nest. So you cannot assume that the non-inverting input voltage = inverting input voltage. RC-Wire - connects to the RC terminal RC red. I found this transformer/relay, but it only has 3 wires. You'll need to already have a C terminal on your HVAC control board for this option to work. PFC adds another switching regulator to your ac-dc power supply. When I uploaded it I slowed it down to 8x. It uses more power than low voltage thermostats because it delivers power directly to your heater. These systems use much less electricity than low voltage systems and can't deliver the right amount of power to Nest thermostats . Nest Temperature Sensor $39.00 View Product Emerson Sensi Smart Thermostat C-wire Kit $27.99 View Product Google Nest Thermostat Trim Kit $14.99 View Product Emerson Wallplate for Emerson Sensi Touch Wi-Fi Thermostat $5.49 View Product Emerson Wallplate for Emerson Sensi Wi-Fi Thermostat $5.49 No more product Note: . NEST THERMOSTAT INSTALLATION & WIRING STEPS TURN POWER OFF REMOVE OLD THERMOSTAT'S COVER CHECK THERMOSTAT WIRING for HIGH VOLTAGE REMOVE OLD JUMPER WIRES LABEL WIRES DISCONNECT WIRES & REMOVE BASE MARK WHERE SCREWS WILL GO ATTACH NEST BASE CONNECT WIRES ATTACH the DISPLAY SWITCH POWER BACK ON SET UP & PROGAM the NEST THERMOSTAT - separate article Compatible with the K312RELAY for heating applications exceeding 15A. However, it doesn't offer many features as compared to the Ecobee Smart Thermostat. 4. Price. If you leave it where it is, the Nest will slowly charge and eventually turn on. DONT WIRE ANY 110/240V to this Thermostat otherwise youll have an expensive paper weight to deal with. Digging deeper i took the attached photos of the system and found what i believe to be low voltage thermostat wire from the heating unit. This is the part which is hard to automate. The thermostat can also support multi stage systems with more than one stage of heating and cooling. It is possible to convert to a low-voltage system if you have a high-voltage system, but it's pretty involved and takes a bit of know-how . Image from Nest.com. The Nest Thermostat requires 20-30V, so if your electric heating system is high voltage (such as 110V or above), it either won't be compatible or you'll need a step down transformer fitted. Obviously, the RC840T will work fine on simple 2-wire thermostats. Add to Cart Add to Wish List Add to Compare. Gas and oil furnaces, heat pumps, and hot water systems are examples of these low voltage systems.