Electrical

Electrical Questions? Ask an Electrician Online.

Ask an Expert,
Get an Answer ASAP!

Electrical
This answer was rated:

I need to replace my old thermostat for radiant ceiling heat.

My old thermostat has red...
I need to replace my old thermostat for radiant ceiling heat. My old thermostat has red black and white wires going to it and is labled line load and common. All the thermostats that I find are for baseboard heaters and have only red and black wires. Will this type of thermostat work ?
Show More
Show Less
Ask Your Own Electrical Question
Answered in 1 hour by:
12/17/2008
electrifier
electrifier, Master Electrician
Category: Electrical
Satisfied Customers: 1,633
Experience: Electrical contractor and electrical inspector for over 24 years with phone and networking expertise
Verified

Is your radiant celing heat 120 volts? Is there a neutral in the feed that supplies the radiant heat if it is 240 volts? Was the white wire connected? Does the old thermostat need 120 volts to work correctly or display correctly?

I will get you an answer with the answers to these questions. Thank you.

Ask Your Own Electrical Question
Customer reply replied 9 years ago

My radiant heat is 240 volts and the white wire is connected to the common screw

Does some part of the thermostat require this white wire to operate? Is the thermostat double pole? How many wires total are in the box with the thermostat? Is there 1 line and 1 load or 2 of each?

Ask Your Own Electrical Question
Customer reply replied 9 years ago
The thermostat has no screw for line 1, a screw for line 2 ,and 3 and 4 are marked load, but on the 4 screw the white is connected and says common on the mfg label. I'm not sure if I need a single pole or double pole
The thermostat you want to use for a replacement has 2 black and 2 red wires if I understand you correctly. This is so it can control a 240 volt circuit. You didn't tell me if there are additional wires in the box with the thermostat. You will only use one set of wires from the new thermostat. One is line and the other is load. Your new thermostat does not require a neutral/common connection so you willl cap that wire off so it doesn't cause any problems. This will allow the new thermostat to control your radiant heat in the same way as the old thermostat did.
electrifier
electrifier, Master Electrician
Category: Electrical
Satisfied Customers: 1,633
Experience: Electrical contractor and electrical inspector for over 24 years with phone and networking expertise
Verified
electrifier and 87 other Electrical Specialists are ready to help you
Ask your own question now
Customer reply replied 9 years ago

1 set of wires to box from breakers are black white and ground. the black wire goes directly to line on old thermostat the white is tied to one red going to heater. the other red wire from heater goes directly to load. I've got a new double pole thermostat. Do I tie the hot black with the 2 blacks on thermostat and tie the 2 reds on thermostat with single red in box and then cap off the white

Customer reply replied 9 years ago
Relist: I still need help.

I just arrived home. We can continue to get your solution here. There is no need to relist.

Now I understand your wiring. The white wire is not a common or neutral wire. The white and the black are the 240 volt lines. These 2 wires need to connect to the two line terminals. The black and red wires from the heater will connect to the 2 load terminals. This will properly disconnect the entire electrical circuit from the heater. Your documentation that came with the thermostat will tell you which is line and which is load so you don't make a mistake. The white wire, by code, is supposed to be identified with black at each termination when it is used as a power wire like this. This will assure nobody will mistake it as a neutral and get hurt by it.

Ask Your Own Electrical Question
Customer reply replied 9 years ago
I'm still confused. The two wires coming from the heater are both red, not black and red. One is tied to the white from the circuit. The new thermostat has one black labled L1 and one labled T1.
The red wires are labled L2 and T2. It doesn't say which is line or load.
L1 and L2 are line while T1 and T2 are load. The 2 red wires from the heater connect to the load side. The black and the white maked black go to L1 and L2.
electrifier
electrifier, Master Electrician
Category: Electrical
Satisfied Customers: 1,633
Experience: Electrical contractor and electrical inspector for over 24 years with phone and networking expertise
Verified
electrifier and 87 other Electrical Specialists are ready to help you
Ask your own question now
Customer reply replied 9 years ago
I think that did it. thanks alot!
If anything else comes up please feel free to contact me. If it's on this topic come here and it will be no more charge. I've enjoyed working with you.
Ask Your Own Electrical Question
Ask electrifier Your Own Question
electrifier
electrifier
electrifier, Master Electrician
Category: Electrical
Satisfied Customers: 1,633
1,633 Satisfied Customers
Experience: Electrical contractor and electrical inspector for over 24 years with phone and networking expertise

electrifier is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

You did one super job of explaining to me everything there is to know about this fridge. I'm looking forward to asking you questions in the future.

JimmyBagley, IA

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

< Previous | Next >

Meet the Experts:

Mike

Mike

Master Electrician

1,426 satisfied customers

Licensed Master Electrician - OnQ Certified Data Voice Audio Video Installer

Jason

Jason

Service Technician

3,942 satisfied customers

Over 20 years of experience in all types of installations, troubleshooting, and repairs.

Mike G.

Mike G.

Master Electrician

7,826 satisfied customers

Proven Professional 48 years Experience

Kevin

Kevin

Licensed Electrical Contractor

3,870 satisfied customers

31 years Licensed Electrical Contractor in Illinois, Adjunct College Electrical Instructor, Former Electrical Inspector, Diploma: Digital Electronics, FCC Technician License

AssuredElectrical

AssuredElectrical

Master Electrician

3,264 satisfied customers

Contractor-42+ Years in the ElectricalTrade

electrifier

electrifier

Master Electrician

1,633 satisfied customers

Electrical contractor and electrical inspector for over 24 years with phone and networking expertise

Rich

Rich

Master Electrician

1,115 satisfied customers

Over 35 years residential, commercial, industrial wiring, install, troubleshoot, service, maintain

< Previous | Next >

Related Electrical Questions
My builder hard wired the ceilings for smoke detectors, but
Hi. My builder hard wired the ceilings for smoke detectors, but there is only one white wire and one red wire. What does this mean?I'm trying to install a nest smoke/carbon monoxide detector and it lo… read more
Mike G.
Mike G.
Master Electrician
Vocational, Technical or Trade Scho
7,826 satisfied customers
I'm trying to wire a pass & seymour l630p plug with an
I'm trying to wire a pass & seymour l630p plug with an european cord (yellow/green, blue and brown wires), I have the ground wire (the yellow/green) hooked to the proper terminal, but unsure what wire… read more
Mike G.
Mike G.
Master Electrician
Vocational, Technical or Trade Scho
7,826 satisfied customers
Bay light has two wire said it is 220 volt how do you wire
bay light has two wire said it is 220 volt how do you wire it … read more
Kevin
Kevin
Licensed Electrical Contractor
Diploma
3,870 satisfied customers
I have three black wires and three wires I don't remember
I have three black wires and three white wires I don't remember how the light switch was wired so far I have capped all three white wires and I found my hot wire but now the outlet next to the light s… read more
Mike G.
Mike G.
Master Electrician
Vocational, Technical or Trade Scho
7,826 satisfied customers
I'm trying to wire up a dimmer...I have 2 black wires in the
I'm trying to wire up a dimmer...I have 2 black wires in the box, a green ground and 2 white wires...how do I connect the dimmer? … read more
George Smith
George Smith
Vocational, Technical or Trade School
322 satisfied customers
My deep well 220 pump has one wire and 2 identical wires.
My deep well 220 pump has one green wire and 2 identical gray wires. The wires that attach to them are green, red and yellow. I understand green on green but if the red and yellow are both hot does it… read more
Kevin
Kevin
Licensed Electrical Contractor
Diploma
3,870 satisfied customers
I have 3 wires and 3 black wires, and I'm trying to hang a
I have 3 white wires and 3 black wires, and I'm trying to hang a kitchen light I can't seem to get it to work. … read more
Kevin
Kevin
Licensed Electrical Contractor
Diploma
3,870 satisfied customers
I have 2 black wires, 2 capped together wires., and two
I have 2 black wires, 2 capped together white wires., and two copper wires that are tied together but not plugged into anything. We are trying to wire a motion sensor that has 1 black, 1 red, and 1 ye… read more
George Smith
George Smith
Vocational, Technical or Trade School
322 satisfied customers
I have a purple wire, a yellow, wire and grey wire and need
I have a purple wire, a yellow, wire and grey wire and need help installing a fan … read more
Sam I
Sam I
Electrician
B.S.
474 satisfied customers
I need to wire a 2 speed fan ( red, white, and black wire)
I need to wire a 2 speed fan ( red, white, and black wire) to a 6 pin carling or rocker switch that is ON-OFF-ONI want one side of the on to go to the low and the other to the high switch..Can send pi… read more
Mike G.
Mike G.
Master Electrician
Vocational, Technical or Trade Scho
7,826 satisfied customers
Fan with light kit white wire, blue wire and black wire. Try
Fan with light kit white wire, blue wire and black wire. Try to connect to three way switch wires to ceiling box are white, red and black. … read more
Sam I
Sam I
Electrician
B.S.
474 satisfied customers
Need to wire a 240 volt single phase 3 wire motor. Just
the motor has 2 connections for the hot wire and also has a common… read more
Mike G.
Mike G.
Master Electrician
Vocational, Technical or Trade Scho
7,826 satisfied customers
I have 3 black wires and 3 wires and 1 coming out of
I have 3 black wires and 3 white wires and 1 white coming out of electrical outlet, how t … read more
Mike G.
Mike G.
Master Electrician
Vocational, Technical or Trade Scho
7,826 satisfied customers
I have a sauna that is wired with 240 two wire for load (red
I have a sauna that is wired with 240 two wire for load (red and black) and a ground -- the neutral line (white) is not used -- currently it is not on a GFI and I would like to put it on a GFI - I wou… read more
Mike G.
Mike G.
Master Electrician
Vocational, Technical or Trade Scho
7,826 satisfied customers
TROUBLE WIRING A LEVITON 6683. I HAVE ONE HOT WIRE BLACK/
I AM HAVING TROUBLE WIRING A LEVITON 6683. I HAVE ONE HOT WIRE BLACK/ WHITE /GROUND. I AM TRYING TO WIRE 2 /6683 SWITCHES OFF THIS WIRE TO GO TO DIFFERENT LIGHTS … read more
Mike G.
Mike G.
Master Electrician
Vocational, Technical or Trade Scho
7,826 satisfied customers
Had broken wire from outside breaker. changed wire to
had broken wire from outside breaker. changed wire to copper. 60 amp breaker trips when power is turned back on. disconnect wire on 60 amp wire and still have voltage in disconnected wire … read more
Mike G.
Mike G.
Master Electrician
Vocational, Technical or Trade Scho
7,826 satisfied customers
How do I wire a motion sensor with black and supply wires,
Hi! How do I wire a motion sensor with black and white supply wires, red (or pink) light wires and red, blue and brown sensor wires? Thanks. … read more
Sam I
Sam I
Electrician
B.S.
474 satisfied customers
Trying to wire a levity 1201-PLR up. Have three wire cable
trying to wire a levity 1201-PLR up. Have three wire cable in box, White, black, neutral. Thought I had it right but light doesn't illuminate … read more
Sam I
Sam I
Electrician
B.S.
474 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x