Ok, this is similar yet different to a previous topic. (https://www.askmehelpdesk.com/heating-air-conditioning/thermostat-hookup-problems-50240.html) I'm trying to install the Honeywell RLV430 to replace an older dial thermostat.

The original thermostat has 2 black wires, one white, and a bare copper going to it.

My first observation is that there is no place for the bare copper wire on the back of the Honeywell.

One of the black wires is single as far as I can see, which is only a few inches. The other black wire is the result of two black wires coming together. The white wire comes from the joining of three white wires.

Do I join one of the Honeywell wires to one of the black wires, the other black wire to the other Honeywell wire, cap off the white, and cap off the ground? I would think the ground would go somewhere on the new unit but there's no place for it.

The unit has instructions for 2 and 4 wire but the 4 wire make no sense and are visual only, no useful written explanation.

http://www.innerseed.net/misc/t-stat1.jpg

http://www.innerseed.net/misc/t-stat2.jpg

Honeywell RLV430 instructions (http://www.homedepot.ca/wcsstore/HomeDepotCanada/images/catalog/b7867367-6c05-4c82-a97c-648044b91564.pdf)

Is the white wire by the black tape connected to 2 wire?

Power is off ? Right?

If so clip white wire off and securly wirenut those 2 wires together and with the remaining 2 black wires attach them to the 2 wires on the thermostat.

NOTE; Did you check the load on the original thermostat?

Below is from the instructions.

This thermostat cannot be used on a resistive load over 14.6 A

juggallojed - The white wire is connected to two other white wires in the wall, a total of three come together as one that contacts the original thermostat. Power is off.

hvac1000 - I checked for the amperage first thing on the old one and I can't find amperage data on the original thermostat. There is a little white tag but it's too far gone to read. But all the thermostats in the house are the same so I'll disable the power and try another to see if I can read it's tag. The breaker is a twin and is rated for 20 amps. It has the baseboard heaters for three rooms on it.

((The breaker is a twin and is rated for 20 amps))

You should be OK on the amp draw. I would not take any more loose than you have to. They are old and they could break just from removing them since the wires are also old.

Thanks.

But back to original question: how do I wire it? It appears the two wires from the new thremostat go to the two black wires on the old on as if to control the current, but what about the neutral and ground? I can understand capping off the neutral but I just find the 'no ground' concept hard to believe but there is no spot for it nor do the instructions mention it.

FYI, the house was built in 1984.

Questions

Where was the bare ground wire originally installed on the old thermostat?
Note: The new thermostat has no metallic exposed parts for a person to touch.This could be the reason for no ground. If that is the case roll it or fold the bare ground back into the metallic box in the wall. If the metal box in the wall is not grounded to the bare ground wire it should be so attached with a green self tap serrated edge screw. The serrated edge screw(electric slang) cuts into the metal of half loop that is already in the wire and makes a better ground. OR you can but a box clip that will allow the wire to be pushed onto the outside edge of the box. They both do the same thing.

Screw and clip types below.

http://www.acehardwareoutlet.com/(dfm0ye55vuy4fq550bpnng45)/ProductList.aspx?CommodityGroupId=34&MerchandiseClassId=313&ProductGroupID=10


On page two of the install instructions is the wiring diagram for wiring the thermostat. NOTE you might have to sound out the wires on your heater to make sure you connect the correct ones. Without being there all I could do is take a guess as to where they go but I would not want to be the cause of any damage to your new thermostat.

You will need a meter and have to work with live 220 volts to be able to correctly sound out the wires.

Note it looks like white wire might have been spliced under the tape.

Does this thermostat run one or two heaters?

The bare wire was installed onto the metal backing of the old thermostat with a self tapping screw. I removed it to pull out the backing plate far enough to take the above photo.

The box in the wall is plastic, not metal.

This thermostat only controls one heater, only one thermostat in the house has two heating elements.

The white wire is connected to two other white wires back in the box, the tape in the photo is on the black wire.

The instructions say "the thermostat wires are not polarized; either wire can be connected to the load or to the power supply."

I didn't see any wiring diagram other than the ones beside step 2. They don't tell me what I need to know.

Ok, I hooked the two black wires to the two wires on the new thermostat, left the white wire connected to the old thermostat which was touching nothing, ground wire also touching nothing. I turned on the power and the new thermostat came on, no fireworks. I'm guessing this is the correct setup for it but want to be sure. Hey, I'm a perfectionist and I own the place.

The box in the wall is plastic, not metal.

You do not have to bond ground the plastic box. LOL

If it works it must be correct. Good deal glad you got it going.

Thanks again. My experience is in automotive hence even something this basic in AC wiring to me warrants a second opinion and clarification. I was really struggling about grounding a plastic wall box. :)

I figured I'd try the bathroom thermostat and if that works then I can do the rest of the house and program it. Now the bathroom should be warm for my shower when I get up. Hey, it's exciting for me.

Again, thanks for the assistance and clarification.

I have a red wire white wire gray wire and a copper wire hing out the wall for my base broad heater. How do I hook up a RLV430 thermostat.

I removed the old honeywell thermostat from the electrical box which only has two (2) wires coming out the belectrical box (one (1) Black and one (1) White and replaced it with the new thermostat RLV430 as per the instruction guide, and when I turn the power on, Nothing happen. What am I doing wrong? The old one was working.Help?

When the time say 12:00 on a 24 hour is that am or pm?

When the 24 hour time say just 12:00 is it am or pm