Hybrid Car – More Fun with Less Gas

Converting radiant floor heat from AC to DC

register ::  Login Password  :: Lost Password?
Posted by Scott Loupin on February 24, 2005, 6:08 pm
Anyone have experience with radiant floor heating?

Specifically, I've got a
radiant system and want to convert the circulation pumps to 24VDC, to save
some energy.  How would I do this?  Or should I call the installer and have
him do it?  I can get 24VDC pumps, but am not sure how to change over the
wiring system, adding relays, etc.

Thanks in advance,


Posted by DJ on February 24, 2005, 6:53 pm

Scott Loupin wrote:

 How good an electrician and plumber are you? That's what it comes down
to, really. With a professional installer, you get warranty, liability
insurance, and hopefully, trade certification. But also an invoice,
unfortunately ;-).

Actually, out of curiosity, where are you, geographically?

Yep, relays are one way to do it, controlling a 24v power supply (or
battery bank ). The other would be to have a transformer in there,
going from 110v AC to 24v DC on the pump power wiring.

Thing is, sometimes, there's a fair number of wires going into those
pumps, not just two, and you need to be able to tell which you can
snip, and which you can't ;-).

So, tell us how many wires actually go into the AC pumps, and we'll
start from there!


Posted by Scott Loupin on February 24, 2005, 9:54 pm
 I'm in mid-Maine.  I haven't approached the installer of the system yet, as
you say, his work comes with an invoice.  He does good work, though.

I've plumbed up the rest of house, and wired it, too.  Never worked with DC
or relays, though.  I also need to set up a DC breaker box, I haven't
bothered until now.

I'll shut down the system and count wires tonight.


Posted by DJ on February 25, 2005, 1:40 am
 My suggestion, seeing as you're pretty much in the same weather as I
am, sure, count the wires, but don't start changing anything until,
say, mid-May ;-). Then the penalty of unexpected interruptions isn't so
severe as it would be right now ;-).

Sounds like you'd be a good candidate to give this a go yourself. It's
alot less complicated than wiring a house or plumbing in sinks and
 DC and relays and such is fun, actually. Once you get a feel for what
you can do with them, you realize just how handy they are ;-). Might
want to swing by the library and grab a book on "electronics for
beginners" to warm up to all this.


Posted by Scott Loupin on February 25, 2005, 1:16 pm
 That's a good idea!  I've had 'just an hour' projects take up several days,
with parts all over the place and me hunting through the local
plumbing/electrical/whatever shops, looking for the one part I didn't get!


This Thread
Bookmark this thread:
  • Subject
  • Author
  • Date
please rate this thread