240v electric baseboard heat wiring diagram

santro

I am installing two baseboard electric heaters on a wall thermostat. They are 4' each for a total of 2000w. I would like to see a diagram of the wiring. The installation instructions from Honeywell and Fahrenheat are inadequate. I want both controlled by one thermostat.

I am more concerned with how to connect the red/black in the heater and also exactly what is meant by "multiple must be wired in parallel".

Dave632

Are they designed to operate on 120V, 240V, or is the voltage user selectable?

What are the mfr's and model numbers of both the heaters and the T-stat?

santro

240v F2544NWC Fahrenheat heater and Honeywell CT410A,B thermostat.

Dave632

Do you have the A or the B version? A version is single pole (2 wires) and B version is double pole (4 wires). Are there colored leads connected to the T-stat (black and red, probably) or are there labeled connection terminals (such as L1, T2, etc.)?

Dave632

You have more than one heating unit, so it's called "multiple". In parallel means that both heating units are connected to 240+ and 240-, as opposed to a series connection, where the "output" wire of one unit feeds into the "hot" lead of the other. If you did a series connection, each heater would only see 120V, and you'd get much less heat than you want.

The diagram below shows a parallel connection. Ground omitted for clarity.

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santro

I have the B ver. 4 wire The heater has a safety limit wired in it, one wire red goes to the element, the other, black has a wire nut and comes from the safety limit then to the other end of the element. Do I simply break the wire nut connection and connect red/black from the thermostat to these two ends?

Dave632

In case you don't have them, you can see the installation notes here.

Bring the cable (black, white, ground) coming from the T-stat into the junction box that's a part of one end of the heating unit. Wire-nut the two grounds together.

The wire from the safety cutoff should also be black. So you have two blacks wire-nutted together. Remove the wire nut.

Use a wire nut to connect the white from the T-stat cable to either one of the blacks that you just separated.

Use a wire nut to connect the black from the T-stat cable to the other black that you just separated.

Check:

• Grounds together.
• White from cable to one of the blacks from heater
• Black from cable to the other black from heater.

Run another cable from the junction box to the second heater, and repeat the above steps.

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santro

Thank you!! Sometimes we complicate things. You made it seem so simple. I appreciate your help very much. Now I can go finish this job.