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I have a 240 volt electric garage heater manual just has one black wire and one white wire and a ground wire.i hooked the two hot wires from thirty amp breaker to these two lines along with ground and nothing. then i hooked it up to 120volt with one hot wire and white wire with ground and worked with little heat.do i hook both hot wires off 30 amp breaker to were it says black in manual.and white and ground to. will that get my 240 volts.

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No, as long as the heater on the label says 240 volts. You would hook up your 240 v to black and white wire

Posted on Nov 30, 2008

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I have a new heater with diferant terminals from the old one so not sure how to atach the wires


There is no need to rewire the internal of the heater!
Just bring in the electrical supply to the heater, it can be either 120 or 240 volts.
If the heater you have is like the picture associated with your post, then all then have to do is change the supplied plug from 240 to 120. It comes pre set for 240. That plug is inside the cabinet.

If any other brand, then you need to change the wires at the transformer of the heater. All heaters need to be supplied with primary voltage: 120 or 240. Then the control system is supplied with secondary voltage out of the transformer. The secondary voltage is no more than 28 volts. and these wires are normally colored as blue or yellow.

Secondary power is already wired within the heater. NO need to change where they are. You will only need to deal with the Primary wiring.

There are many varieties of transformers that transform high primary voltage to a low secondary voltage of 28 volts. and these transformers have many wires: primary & secondary.
I will try to make this easy to understand.

If you have a Gas Heater Transformer with these colors:
  • Red
  • Black
  • White
  • Green
Or...
  • Red
  • White with Red Stripe
  • Black
  • White with Black Stripe
  • Green
These are Dual Voltage Transformers, you can bring in either 120 Volts or 240 Volts

If you bring in only 120 Volts...
1st example:
The Red wire will not be used! Hot wire to the Black, and the Neutral/Common, to the white wire. Green to ground.

2nd example:
Connect the Red wire with the White with Red Stripe together and connect these to the incoming Neutral/Common wire, normally White.
Connect the Black Wire with the White with Black Stripe to your incoming Hot Wire, which is normally Black.
Green to ground

If you bring in 240 Volts...
1st example.
1 Hot wire to the Red, the Other Hot wire to the Black, and White wire is not used. Green to ground

2nd Example:
Wire nut the two Striped wires together. then one incoming Hot wire to the Black, the other incoming Hot wire to Red.
Green to ground

Or This is only a Low voltage - 120 Volts Only
  • Black
  • White
  • Green
Or either any of these combinations...
  • 2 Blacks w/Green
  • 2 Reds w/Green
  • 1 Black, 1 Red w/green
This type will only be a high voltage, 240 volts only
Picture below is what a transformer looks like and it is where your incoming supply wires go. The smaller leads with the spade connections will go to a specific location & is the 'Secondary" .

Good Luck



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Mar 14, 2015 | Pool & Spa

1 Answer

I have 240 timer switch and I wana use it for 120 ? How can I do that?


if the switch is rated for 240, then hook up the same way but use the 110 black and white wire for 110 volts to switch, instead of the red and black wire for 240 . on 110 black wire is always hot and the white is the neutral wire. the best wire to use is 12/2 with ground.

Jun 20, 2011 | Water Heaters

1 Answer

Haw do i hook up the wires corectly for a hot water heater


I am assuming this is a large 240 volt water heater and you are asking about the connection at the water heater. First thing is to turn the power to the water heater off at the service panel of disconnect if it has one. You will see three wires that connect to the heater. Normally a white, black, and a ground that is usually green or just a copper wire. On the water heater when you remove the plate on top you will have 2 wires. A red & black or a white & black. You will see a ground screw. Connect the green or copper ground wire to that screw. The 2 wires left you connect either one to either wire. Makes no difference as each wire is carrying 120 volts. When you connect these wires secure them tightly with a wire nut, no wire exposed, and then, with electrical tape, tape them up so as the wire nut cannot come off. Push the wires back into the hole an secure the cover on top.

Jan 10, 2010 | Intermatic & Indoor/Outdoor Rain Tight...

1 Answer

I have the Fahrenheat Model FUH 724 heater. The manual states that it can be wired as a 240v 7500W unit but the directions and the unit itself only allow for three wires to be connected Black, White, and...


1st you will belucky if you actually have 240 v, most
homes are usually 220v. In youyr case you need to start at the breaker panel.

This is an example:
You have a Double Pole Single Throw breaker. Black
Wire is hot and goes into one side of breaker,if you havea red wire that goes into the other have of the
breaker.

The white wire ties in the nuetral bar and the bare wire into the ground bus bar. At the unit you hook up the red and the black wire which will supply the 240
Volts, you could tie the white and the ground wires together into the grounding terminal

Jan 01, 2010 | Fahrenheat Ceiling-Mount Industrial Heater...

1 Answer

I am trying to replace a electric baseboard heater that is 220 volts and I am unsure about the wiring. the heater has a red and black wire and there is a white and black wire coming out of the wall.How do...


if you have a electric meter check the voltage coming out of the wall to be sure it is 220 v???? (meter across black and white)then with your meter only test black wire to ground and white wire to ground seperately you should have 110 from each wire to ground?
If you have only 110 to the black and no reading on the white, you either have a bad breaker or a 110v circuit
If you read 220v and you new heater is rated for 220v black to black and red to white wall thermostat or built in as long as you have 220v to your connection from the wall or your wall thermostat when turned higher than room temp.
Bare grounds tie together and mount to your green ground screw

Sep 25, 2009 | QMark FBE15002 electric baseboard heater...

1 Answer

Wiring hook up in the back for whirpool dryer


assuming you are referring to the power hookup,there is no positive negative, (it's not D.C.) red and black are the hot lines(240 volt between them) white is neutral and green is equipment ground.voltage reading should be 120 volts from red or black to white as well as green, 240 volts from red to black, 0 volts from white to green

Sep 08, 2008 | Whirlpool GEW9250 Electric Dryer

2 Answers

Baseboard heater connect


I have a fahrenheat F2548 baseboard heater, there were not any wiriing diagrams or installation instructions in the box where can I find the wiring diagram,

Aug 04, 2008 | Fahrenheat Electric Convector Baseboard...

2 Answers

Install and hot wire heater


You can be assured that the element is 240 volt. The fan motor is also rated at 240 volt. the wires you have black - black are the connections you make to the line. Use a 12/2 with ground. Use a double pole 20 breaker in your panelbox. The green wire is the equipment ground - connect this to the bare wire from the 12/2. On the 12/2 cable - there will be two colors, one black and one white. Wrap a couple of turns of black tape on the white wire both at the heater location and on the white in the panelbox. connect the 12/2 to your 2 pole breaker, the black wire and the taped white to the breaker.

Sep 05, 2007 | Fahrenheat FFH1615 Heater

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