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gotoman for ac
gotoman for ac, HVAC Technician
Category: HVAC
Satisfied Customers: 5218
Experience:  51 years of experience install design and repair of all makes and models of AC
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Here I am replacing an electric heat thermostat. The wires

Customer Question

Customer: hi, ***** ***** here I am replacing an electric heat thermostat. The wires from the wall are 1 red hot, one black hot and one white neutral, and a ground. The new thermostat has 2red and 2 black. not sure how to approach this
JA: Thanks. Can you give me any more details about your issue?
Customer: what else do you need?
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Customer: yes
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Submitted: 1 year ago.
Category: HVAC
Customer: replied 1 year ago.
The new thermostat is a honeywell CT410B -- it is for my shop that has just electric baseboard heat, and I am replacing an old Federal Pacific model PMT2.
Expert:  gotoman for ac replied 1 year ago.

One moment

Customer: replied 1 year ago.
Hi gotoman. Do you have advice for me?
Expert:  gotoman for ac replied 1 year ago.

Are those 115 heaters or 220. How many connected to thermostat. Russ

Customer: replied 1 year ago.
There are 3. They are old intertherm units and I don't know how to tell if they are 220 or 115
Expert:  gotoman for ac replied 1 year ago.

Was the white neutral connected to heaters. Russ

Expert:  gotoman for ac replied 1 year ago.

What color are wires from heater. Russ

Customer: replied 1 year ago.
It was connected to the thermostat. There is only one set of wires coming out of the wall. As mentioned, 2 hot (red and black) and 1 white neutral and a ground. They were all connected to the old thermostat
Expert:  gotoman for ac replied 1 year ago.

Check where wires go into heater. Should be a small panel to remove. There will be a nameplate there. Check voltage. Voltage has to be right or we will blow heaters, Russ

Customer: replied 1 year ago.
240 volts
Expert:  gotoman for ac replied 1 year ago.

Twist 2 black from thermostat together and attach to black from wall. Twist two reds together and attach to red wire from wall. Tape off neutral wire. Russ

Customer: replied 1 year ago.
What do I do with the ground?
Expert:  gotoman for ac replied 1 year ago.

Check to see of there is a ground screw on thermostat base. Russ

Customer: replied 1 year ago.
No
Customer: replied 1 year ago.
Not sure you saw my response. No screw hole on the thermostat for the ground. Not sure what to do with it
Customer: replied 1 year ago.
Gotoman, did I lose you? Almost finished but need to know what to do with the ground wire?
Expert:  gotoman for ac replied 1 year ago.

Sorry just lost Internet service. Ok Looked at picture just tape off ground. That is all plastic thermostat. Russ

Expert:  gotoman for ac replied 1 year ago.

Thanks Russ

Customer: replied 1 year ago.
No worries, just thought you dropped off. It's not working, it didn't blow a fuse though, so not sure where to go from here. In the old set up, the white wire was connected as was the ground. I will open the box on the heater and test if it's hot
Customer: replied 1 year ago.
Here is the baseboard heater wiring. I checked both sides and both are hot even if the thermostat is off.
Customer: replied 1 year ago.
Here is the heater #2. It had one open live red wire, but this was not coming from the Romex supply wire, that only had a black, white and ground. The black was hot and connected to the baseboard heater element...the red that was hot was a returning wire from the heater elements. See attached heater #2
Customer: replied 1 year ago.
I realize this is taking more than expected and if I can solve this I expect to pay you accordingly. Can you stay with it?
Customer: replied 1 year ago.
There is a third baseboard heater is a bit harder to get to, but this one was never touched so I am sure the wireing is fine.
The other 2 had been moved around when a bit of construction went on. The walls they were against were replaced, so they were knocked around. I guess the only remaining question is what to do with that red wire on heater #2.
Expert:  gotoman for ac replied 1 year ago.

Is that 220 volt heater. Russ

Customer: replied 1 year ago.
Expert:  gotoman for ac replied 1 year ago.

The wire from the thermostat can you find where it ties into your heaters. Russ

Expert:  gotoman for ac replied 1 year ago.

When you removed thermostat was the white wire connected. Russ

Customer: replied 1 year ago.
it was
Expert:  gotoman for ac replied 1 year ago.

Can you send photo of old thermostat.

Customer: replied 1 year ago.
This is the old unit
Customer: replied 1 year ago.
The odd thing is that 2 of the 3 baseboards have 12/3 wire and the 3rd has 12/2.
Expert:  gotoman for ac replied 1 year ago.

The power going in we need to knw where thye go. whe they go to heat. Russ

Customer: replied 1 year ago.
How do I tell? I have a multi meter but that is about all. The best I can do is unwire one to see the order of the sequence. Does that matter?
Expert:  gotoman for ac replied 1 year ago.

Just connect red to white. Retry heater to see if it works. Russ

Customer: replied 1 year ago.
Russ, it's not working, but I can't continue on this. I appreciate your help today and will agree to pay what you think is fair. You have been solid on this and I will have to get someone in here to figure this out. I will give you a great rating too, even though we didn't solve it, your were very helpful. I am not sure what the next step is, this is the first time I did justanswer.
Expert:  gotoman for ac replied 1 year ago.

The problem with the site is sometimes you can not fix everything. It is best to be on site. Thanks for everything. Russ