How do you wire a line voltage thermostat?


Chuck Stuart   |   Member since 2011  |  10+ Answers Submitted  |  ✔ Verified

Wiring a Double-Pole Line Thermostat Connect the black wire going to the heater to T1 and the red wire going to the heater to T2. If there are white wires in the box, splice them together and cap them, then twist together the ground wires and connect them to the ground screw.

How Line Thermostats Work. Line thermostats turn on and off electric baseboard heaters. You see, the low voltage circuits pull in a relay that completes the furnace circuit, whereas this thermostat breaks and makes the circuit that directly feeds the furnace.

Also, what are line voltage thermostats? Line voltage thermostats are designed to directly control electric heaters, such as baseboard heaters, by switching the main power on and off to the heater. It is important to select an appropriate thermostat that can handle the rating of the heater that will be controlled.

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Kaylee Eddison   |   Member since 2005  |  10+ Answers Submitted  |  ✔ Verified

Beside this, how do you wire a 240 volt thermostat?

How to Wire a 240V Thermostat

  1. Turn the power off at the service panel and double check the wires with the circuit tester.
  2. Strip ˝ inch of insulation from the two hot wires coming from the service panel with the electrical pliers.
  3. Connect the two 120 volt hot wires from the service panel to the thermostat's two black "line" wires.

Javier Notman   |   Member since 2018  |  10+ Answers Submitted  |  ✔ Verified

Can you use a 240v thermostat on 120v?

when you 're up over 2kw, 240V is just the smart way to go. You can use mechanical 240V thermostats with 120V just by wiring both poles in series. That won't work with electronic 'stats, as they need a way to power themselves and they are "geared" to poach power off the 240V.


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Related Answered Questions

Below is a list of answers to questions that have a similarity, or relationship to, the answers on "How do you wire a line voltage thermostat?". This list is displayed so that you can easily and quickly access the available answers, without having to search first.

Jacqueline Tindall   |   Member since 2018  |  ✔ Verified

How do you install a thermostat?

How to Install a New Thermostat

  • Turn Off Power to A/C and Furnace. Better to be safe than sorry.
  • Remove Face of Old Thermostat.
  • Take a Picture of the Wires.
  • Disconnect Wires from Old Thermostat.
  • Remove Old Mount.
  • Put on the New Thermostat Mount and Connect Wires.
  • Screw Faceplate Mount to Wall.
  • Attach New Thermostat Face.

  • Rufus Flett   |   Member since 2005  |  ✔ Verified

    What do the colored wires mean on a thermostat?

    Rh stands for Red-Heat and Rc stands for Red-Cool. If you only have a single red wire the jumper between Rh and Rc are required for some heating and cooling hybrid systems depending on your thermostat . Yellow /Y is the AC compressor. White/W is the Heating element. Green/G runs the fan.


    Marigold Judd   |   Member since 2016  |  ✔ Verified

    How do you test if a thermostat is working?

    Here's how to test your thermostat to see if it works:

  • With the power to the furnace off, remove the thermostat or thermostat cover to expose the wires.
  • Unscrew and remove the wires from their terminals.
  • Twist the bare ends of the two wires together.
  • Turn the power to the furnace back on.

  • Johnny Osmond   |   Member since 2012  |  ✔ Verified

    How do you override a thermostat?

    How to Override Your Hotel's Thermostat Controls and Make it as Cool or Hot As You'd Like

  • Holding down the “display” button.
  • While holding that button, press “off”
  • Release off, continue to hold down display, and Press the “up” arrow button.
  • Release all buttons.

  • Rick Eastwood   |   Member since 2005  |  ✔ Verified

    Does Nest make a line voltage thermostat?

    The Honeywell Lyric, Nest and other smart thermostats are designed to work with central home heating systems. Those are controlled by low voltage thermostats , which use 24 volts. Electric baseboard and fan heaters work with line - voltage thermostats , which can be either 120 or 240 volts.


    Erick Vernon   |   Member since 2014  |  ✔ Verified

    How do you convert a low voltage thermostat to High Voltage?

    You replace the line voltage thermostat with the switching relay, then add low voltage wire from a transformer to power the Nest or other low - voltage thermostat . Wires from the low voltage thermostat simply run to and turn on or off the switching relay.


    Trisha Bryant   |   Member since 2013  |  ✔ Verified

    How do you wire a double pole voltage thermostat?

    For double-pole thermostats:

  • Using wire connectors, connect a hot supply wire, which is typically black, to thermostat wire one (typically it is marked L1 or Line).
  • Connect the remaining supply wire, which is typically white, to the second thermostat wire (typically marked L2 or Line).

  • Jayden Redwood   |   Member since 2011  |  ✔ Verified

    How do you wire a 2 wire thermostat?

    Most two- wire thermostats wire have a red and white wire encased in a brown insulated coating. Strip the red and white wires back about 1/4 inch at both the thermostat and the furnace ends. Connect the white wire to the "W" terminal on the furnace and thermostat .


    Marie Pond   |   Member since 2017  |  ✔ Verified

    How many volts does a thermostat use?

    24 volts


    Chad Yard   |   Member since 2012  |  ✔ Verified

    What is line voltage wiring?

    Line voltage is the standard voltage —120 volts—that's found in outlets and junction boxes in the United States and Canada. Low- voltage lighting typically uses 12 or 24 volts and requires a transformer to lower the line voltage from 120 volts to avoid immediately burning out the low- voltage bulb.


    Martin Baxter   |   Member since 2012  |  ✔ Verified

    How does a thermostat work?

    At its core, a thermostat is simply the controls used to regulate temperature in a heating system. You can set a preferred temperature, and the thermostat works to keep your room or boiler at this desired level. If the home starts to drop in temperature, a thermostat switches the heating on to warm it up.


    Lily Devonport   |   Member since 2019  |  ✔ Verified

    Can I use a 4 wire thermostat on a 2 wire system?

    Yes, you can connect a four wire thermostat to this setup. Connect the white wires in the same manner as the black wires are connected.


    Alan Mcgregor   |   Member since 2010  |  ✔ Verified

    How do you check if a thermostat is working?

    4 signs your thermostat is bad

  • Sign #1: Your thermostat has no power or is unresponsive.
  • Sign #2: Your heater or A/C won't turn ON.
  • Sign #3: Your A/C or heater runs constantly and won't turn OFF.
  • Sign #4: Room temperature and setting don't match.
  • Step #1: Make sure thermostat is on the right setting.

  • Matt Anderson   |   Member since 2013  |  ✔ Verified

    How does a low voltage thermostat work?

    Low - voltage thermostats are powered by a transformer that reduces the incoming line voltage from 120 volts down to a level between 12 and 24 volts, depending on your furnace design.


    Alan Bullock   |   Member since 2013  |  ✔ Verified

    Can I use a line voltage thermostat for low voltage?

    NOTE: Before you consider which thermostat you need, make sure you know what type of circuit you have. A low voltage thermostat will not work with line voltage wiring.


    Harvey Kelly   |   Member since 2010  |  ✔ Verified

    Should I use a single pole or double pole thermostat?

    Double pole thermostats have an "off setting" and break both sides of the heater's power line. Single pole thermostats only have a "low" setting and no true "off" setting, and break only one side of the heater's power line. They typically have two (2) connection wires.


    Cadence Hope   |   Member since 2016  |  ✔ Verified

    Can you wire a double pole thermostat as a single pole?

    Double - Pole Thermostats . A single - pole thermostat opens the circuit by cutting current through one or the other of the hot wires . Double - pole thermostats open both hot wires . The circuit is energized only between the breaker box and the thermostat , and there should be no risk in working on the heater.


    Karen Fulton   |   Member since 2018  |  ✔ Verified

    How do I know if my baseboard is 120 or 240?

    Look at the circuit breaker for the baseboard heater and the wire or wires that connect to it. A circuit breaker with one wire indicates the baseboard heater operates at 120 volts. Two wires supply 240 -volt heaters.


    Carl Weasley   |   Member since 2007  |  ✔ Verified

    Can thermostat wires shock you?

    SO: it's always safe to turn off the furnace power. Check with a meter for all wires to all wires at the thermostat . If you start messing about with these, you don't risk getting an electric shock , but you do risk damage to the electronics.


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