Hi, I am trying to replace a king thermostat that controls two wall heaters with a Honeywell programmable thermostat rlv430, and the instructions make no sense to me. I have 2 sets of wire, both have one white and one black wire, and a ground wire that was connected to the old therm. The new therm. Doesn't have a place for the ground, and the box is plastic. The only way to get it to work is to connect the two whites together, and hook the two black (one on each of the two wires on the new therm.) to the thermo stat.
The ground has no where to go. My problem is I can't get the heat to turn off! It just keeps running and the thermostat will be turned down all the way. Please help, I am electrically challenged to begin with!

I have the same problem. Can anyone answer this? Thanks!

Looking over the wiring diagram provided with the instructions for this thermostat,
http://www.homedepot.ca/wcsstore/HomeDepotCanada/images/catalog/b7867367-6c05-4c82-a97c-648044b91564.pdf,

Seems fairly straight forward.

In the first post, splicing the whites, and connecting the two blacks in the box one to each black on the stat, should not be the problem.

If the outlet box is plastic, and the stat is plastic, just wrap up the ground wire and push back into the box unconnected, as there is no purpose for it in this case. Do not cut off.

Note the limitations of the stat listed in the instructions:


The thermostat cannot be used with the following:
• a resistive load under 2 A
• a resistive load over 14.6 A
• systems driven by a contactor or relay (inductive load)
• central heating systems

Also, connecting the stat with the power on can damage the stat.

Does resetting the stat have any positive effect?

Not sure how else to help either question from here.

I think the answer is that the RLV430 cannot be used with a 4-wire or double-pole set up. I'm going to get the Honeywell TL8230, which I believe will work.

I talked to an electrician who said that it won't work because of the 4 wire mumbo jumbo, and that the amperage needed to be 22 amps. I have to get a specialized one that will run it. It is a King heater system, and I have one ordered through them. About 35 bucks, which is better than the 50 I spent on the Honeywell. Thanks for the help.