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Old 01-06-2010, 05:00 PM   #1
 
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Warm tiles 240v thermostat


I am trying to wire a 240v thermostat for radiant heat. I am trying to use two 120v and it has not work for me and not sure it will. The thermostat is a FTS-2 model made for the warm tiles radiant heating. It has a black and white wire and every combination of wiring I have tried has meet with negative results. Any suggestions?
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Old 01-06-2010, 05:21 PM   #2
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Have you tried looking at the instructions? What exactly are you trying to do? Hook two different 120 circuits to a 240V thermostat? You need to get the correct thermostat for the type of cable you have.
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Old 01-06-2010, 06:13 PM   #3
 
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It really does not give you good directions just a diagram. I am just trying to wire the thermostat, but I am trying to run the wires from a junction box that also runs the dryer. There are three wires and I am sure two of the wires are 120 and I believe the third is the neutral wire. The thermostat only has two wires and not three.. I have included a link to the directions.
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Old 01-06-2010, 06:13 PM   #4
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What do you mean when you say (2) 120v ?
You have 2 hot leads from a 240v breaker so they are from opposite hot feeds on panel?

Does it require a Neutral ?

What is not working ?



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Old 01-06-2010, 06:15 PM   #5
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Quote:
Originally Posted by cybertone View Post
It really does not give you good directions just a diagram. I am just trying to wire the thermostat, but I am trying to run the wires from a junction box that also runs the dryer. There are three wires and I am sure two of the wires are 120 and I believe the third is the neutral wire. The thermostat only has two wires and not three.. I have included a link to the directions.
You're joking right? Stop what you're doing and call an electrician. You can't tap into your dryer circuit to run your flooring. However, I would like to see pictures of what you have already done.
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Old 01-06-2010, 06:23 PM   #6
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You CAN NOT do what you are trying to do

As said, stop & get an electrician to connect this

http://warmtiles.com/pdf/FTSThermTempInstall.pdf

Unless......
Is the dryer connection still in use by a dryer ?
I assume so since you say "also runs the dryer"

How much wire & what do the instructions tell you is needed for a breaker & a circuit?

If the dryer is a 30a (most are) then you are creating a fire hazard if you are using normal #12 wire
I hope you haven't fried the thermostat somehow
Its listed as 24a MAX

******Correction - seems to be listed as 16a MAX********



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Old 01-06-2010, 06:28 PM   #7
 
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The connection I am using is not coming from the dryer, but coming from the circuit breaker. I open the junction box before the wires goes to the dryer for hookup. Right now I don't have anything hooked up, but I might go with the 120v if I can't get the 240v. Yes, the 120v works, just wondering if the 240v will work from two 120v.
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Old 01-06-2010, 06:31 PM   #8
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Did you buy 120v wire or 240v wire ?

Doesn't matter where you are tapping into the circuit
You can't do it



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Old 01-06-2010, 06:36 PM   #9
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Which kit did you buy?
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Old 01-06-2010, 06:37 PM   #10
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Quote:
Originally Posted by cybertone View Post
The connection I am using is not coming from the dryer, but coming from the circuit breaker. I open the junction box before the wires goes to the dryer for hookup. Right now I don't have anything hooked up, but I might go with the 120v if I can't get the 240v. Yes, the 120v works, just wondering if the 240v will work from two 120v.
What do you mean by "the 120V works"? Ok, reality check time. This is an easy install if you have a basic understanding of electrical theory and install methods. You have neither. Time to cut your losses and call a pro. Sorry to be blunt, but this is not an install to learn on. I'll have to check but this circuit may require GFI protection.

Last edited by jerryh3; 01-06-2010 at 06:42 PM.
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Old 01-06-2010, 06:59 PM   #11
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For one the dryer requires its own circuit, not to be shared. Two, the overcurrent protection is too high for the floor heating.

I will echo that you are over your head. Stop now before it costs you even more to fix your mistakes.

Jerry, the T-stat I worked with had GFI protction built into it.
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Old 01-06-2010, 07:13 PM   #12
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Quote:
Originally Posted by Jim Port View Post
For one the dryer requires its own circuit, not to be shared. Two, the overcurrent protection is too high for the floor heating.

I will echo that you are over your head. Stop now before it costs you even more to fix your mistakes.

Jerry, the T-stat I worked with had GFI protction built into it.
This T-stat also has built in GF protection, but I believe any floor cable heating system requires GFCI protection for the entire circuit-424.44(g).
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Old 01-06-2010, 07:19 PM   #13
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Quote:
Originally Posted by jerryh3 View Post
This T-stat also has built in GF protection, but I believe any floor cable heating system requires GFCI protection for the entire circuit-424.44(g).
I do not see where it indicates the protection must be at the breaker
The cables terminate in the thermostat



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Old 01-06-2010, 07:27 PM   #14
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Quote:
Originally Posted by Scuba_Dave View Post
I do not see where it indicates the protection must be at the breaker
The cables terminate in the thermostat
That may be one of things that each AHJ will have to decide how they want to enforce it. But this is taken from the thermostat spec sheet:

Per U.S. National Electrical Code - Installation in a bathroom
requires that this device be installed on a circuit protected by a
separate Ground Fault Circuit Interrupter (GFCI).
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Old 01-06-2010, 07:33 PM   #15
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#1: He's been asked a few times whether he purchased a 120v or 240v system and he hasn't/can't answer.

#2: He doesn't know 120 from 240.

#3: Right from the start this guy doesn't know what he's doing and he refuses to do the right thing and hire a licensed electrician.

#4: Back away quickly before he gets the wrong information, uses it, puts a load in the dryer before going to bed and burns his house down with is family inside.

P.S Line voltage electric radiant heating systems require their own circuit and are most often GFCI'd at the Tstsat though this one seems to be the exception. Low voltage radiant does not.
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