[breaking40]

Excerpts from last year - Now I find this post because I am trying to replace my old Cadet M411 thermostat with a 4-wire Cadet (Honeywell) it has two reds and two blacks.

My box has 4 Cadet baseboard fan heaters joined to a single pole M 411 thermostat. Just like last year, it has three wires coming off it, a black and a red, each of the same gauge as the wires coming from the box, then a white that is a smaller wire. It joins a separate nut in the box than the other two, which appears to be the gang of white wires coming from the heaters. The red wire from the thermostat is connected to a black lead that is coming from the gang of black wires coming from the heaters. The black wire appears to be going to the hot lead from the circuit breaker.

My new thermostat has four wires. Two red and two black. It is a Cadet (honeywell) non-programmable digital T114 - How the heck do I hook this thing up? Again, I have a gang of whites from Thermostat to heater and a gang of blacks thermostat to heater. I then have a gang of grounds, as well as a black lead that comes out from the top of the box, logically the lead from the circuit breaker to the thermostat. Can anyone provide an assist here?

Here is the post from a year ago - I found it because of searching for Cadet M 411. They have pictures of my old three wire thermostat, so to speak.

Thanks!

I'm having problems hooking up my new thermostat and need an expert to assist me. I've done a major bathroom remodeling by myself, but always seem to get stuck on electrical items. Changing the thermostat is no different. BTW, the thermostat works, I simply want to change it due to aesthetics.

Background: I have Two Cadet in wall heaters, a Perfect Toe type floor model and a C122 wall unit.

I have a Cadet single pole thermostat, model # M411. (pictures attached)

I'm replacing it with a Honeywell RLV430A

Here's my problem... I literally melted the first thermostat I tried to replace it with and am now skittish. I did learn that the unit I was trying to install was NOT compatible with my Cadet heaters... lesson learned.

The Honeywell thermostat has only TWO wires coming from it. The Cadet thermostat has THREE wires coming from it. The Honeywell instructions gives me no clue how to hook this up.

The current wiring looks like this:

There are three "normal" household in-wall wiring looms (I don't know what the three wire strands are officially called) that must come one each from the heater unit and one must come from the fuse box. Each has a Black wire, a White wire and an exposed copper wire. In my description below, I will call wires from the Household in-wall wiring looms, "HH" wires.

Attached to the thermostat's red wire is ONE Black HH wire. Attached to the thermostat's black wire are TWO black HH wires. Attached to the thermostat's smaller white wire are all THREE white HH wires.

Oddly, all three wires attached to the thermostat seem Hot. I've tested them using a circuit tester showing voltage and one of those do-dads that simply detects a Hot wire. All three constantly show approx 120 volts, regardless of whether the heaters are actually running or not. I really don't understand this, but given the fact that the heaters seem to run fine, I won't question the Black Magic of electricity :-)

Given that the new Honeywell has only TWO black wires coming from it, how do I hook this up using this configuration?

Any help you can provide will be GREATLY appreciated!!

Happy Holidays!

Terron


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[hvac1000]

Here is all the information you need.

http://customer.honeywell.com/techli.../69-1874ES.pdf

[breaking40]

Thanks HVAC - Sounds like I am in over my head due to the original wiring where 4 units are tied to a single thermostat. I think I will call a Pro to ensure I get it done properly and have the combined load covered sufficiently. Most troubling is that all of those wires are coming into a small standard box. I guess talking to the tech support guy at Cadet, who would not answer many questions, made me nervous!

Thanks again!