240v Thermostat On 120v System? - Electrical - DIY Chatroom Home Improvement Forum
Advertisement


Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Electrical

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Display Modes
Old 03-11-2013, 10:33 AM   #1
Member
 
heinlein0311's Avatar
 
Join Date: Nov 2011
Posts: 63
Rewards Points: 79
Default

240v thermostat on 120v system?


I am installing a 120v radiant floor heat system in my bathroom. I already have a 240v thermostat that is for radiant floor heat. Can I use this thermostat if I wire it the same as I would for a 120v thermostat? Instead of 2 leads, just wire the one?

Advertisement

heinlein0311 is online now   Reply With Quote
Old 03-11-2013, 10:37 AM   #2
Member
 
Join Date: Jan 2013
Posts: 651
Rewards Points: 622
Default

240v thermostat on 120v system?


Don't know if it works on all thermostats or not, but I cut a baseboard heater from 240 to 120 and the thermostat worked just fine.
I just changed it at the breaker box; the rest of the wiring remained as it was.

Advertisement


Last edited by Toller; 03-11-2013 at 10:39 AM.
Toller is offline   Reply With Quote
Old 03-11-2013, 11:39 AM   #3
Member
 
Join Date: Jun 2007
Posts: 3,514
Rewards Points: 2,016
Default

240v thermostat on 120v system?


You can wire it with one lead (hot) or both hot and neutral.
J. V. is offline   Reply With Quote
Old 03-11-2013, 12:09 PM   #4
Member
 
Join Date: Nov 2007
Location: Nashua, NH, USA
Posts: 7,090
Rewards Points: 2,280
Default

240v thermostat on 120v system?


The 240 volt line voltage thermostat works perfectly well on a 120 volt circuit.

The reverse is not true. A thermostat rated for 120 or so volts may not have both hot leads of a 240 volt circuit connected to the thermostat unit even if there is a neutral giving 120 volts hot to neutral.
__________________
When cleaning anything including baby diapers, it is better to sweep off or scrape off as much solid and semisolid material as you can first. (1) Less cleaning fluid or detergent needs to be used, (2) Less of a mushy mess which in turn means that bleaches or disinfectants will be more effective.
AllanJ is offline   Reply With Quote
Old 03-11-2013, 12:19 PM   #5
Member
 
heinlein0311's Avatar
 
Join Date: Nov 2011
Posts: 63
Rewards Points: 79
Default

240v thermostat on 120v system?


Awesome, thanks guys for the good info, it's well appreciated!
heinlein0311 is online now   Reply With Quote
Old 03-11-2013, 01:28 PM   #6
Semi-Pro Electro-Geek
 
Join Date: Jul 2009
Location: Arizona, USA
Posts: 2,620
Rewards Points: 2,136
Default

240v thermostat on 120v system?


If it is an electronic thermostat it probably will not work. If it is non-electronic, then it should be fine.
__________________
I am a lawyer, but not your lawyer. And who cares anyways? We're here to talk construction. This is DIY advice, not legal advice.
mpoulton is offline   Reply With Quote
Old 03-13-2013, 06:42 PM   #7
Electric Radiant Heating
 
warmsmeallup's Avatar
 
Join Date: Apr 2008
Posts: 205
Rewards Points: 150
Default

240v thermostat on 120v system?


The GFI probably won't work either....

Advertisement

__________________
www.comfortradiant.net
warmsmeallup is offline   Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Looking for some help with 240v to 120v wiring Tyrus3 Electrical 4 06-07-2012 10:28 AM
Totaline wireless thermostat not showing the correct temperature and system not cooling upper floors phuheey HVAC 3 06-01-2012 06:52 PM
240v Air Compressor to 120v help ruacoltsnut General DIY Discussions 10 11-11-2010 05:05 PM
Permit For Fire Sprinklers letnes Plumbing 18 10-14-2010 06:23 PM
A/C won't turn off with thermostat temp adjustment ( Goodman system ) rkpatt HVAC 3 07-29-2008 05:58 PM




Top of Page | View New Posts