Common wire for nest
Hello everyone. I tried using the search function but then at the same time. I feel like I wouldn't know if my scenario is the same as someone else's because I don't understand my hookup that well to understand other people's hook up.
I want to add a common wire, so I thought why not use the green wire. But I don't know how
I have one heater that is controlling two zones. The zones are activated by a valve.
I I know there are different versions of it this aquastat n I think I got the picture of my model.
I I tried providing quite a lot of pictures to help if anything.
The wires that that are going to my thermostat are red white and green The green is not connected
Comments
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Yes, you can use the unused green wire for a common.
My recommendation is to use a separate relay and transformer to get a C wire. This method causes less problems IMHO. I have attached a generic wiring diagram which will probably have to be changed.
@EdTheHeaterMan is the resident Nest expert. He will probably respond,
or you can PM him
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traveling. Will be off line for another 24 hours. Will respond then.
Edward Young Retired
After you make that expensive repair and you still have the same problem, What will you check next?
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Thanks guys. I will add some more pictures of the wiring then. In a few
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That is correct. Are those Honeywell zone valves? What model? Do they have four wires connected to each one, or only three?
All Steamed Up, Inc.
Towson, MD, USA
Steam, Vapor & Hot-Water Heating Specialists
Oil & Gas Burner Service
Consulting0 -
2 Red 2 yellow
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I'm Not sure if this extra picture will help but at least these pictures show where the thermostat lines come in.
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Oh could embed pictures in the post.
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Kind of a typical C wire hookup with 4 wire zone valves.
National - U.S. Gas Boiler 45+ Years Old
Steam 300 SQ. FT. - EDR 347
One Pipe System
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Ok makes sense. I need to see where the green wire from the thermostat ends up.
I do remember I could have sworn that I had a voltage coming from the green wire by my thermostat but I'll just have to double check that next time.
If If my green wire is somehow hooked up I got to see what's that about
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Wires that are not used and not connected to anything but parallel other wires that are energized may have a ghost voltage as some folks call it, there are various reasons for it. Inspect the wires and if unused build the C wire path that you need.
National - U.S. Gas Boiler 45+ Years Old
Steam 300 SQ. FT. - EDR 347
One Pipe System0 -
Now that I have had a chance to look carefully at the original post, I have only one observation. There may not be enough different photos of the L8148 control. But that is just one man's opinion.
And this:
Edward Young Retired
After you make that expensive repair and you still have the same problem, What will you check next?
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There are some Electric code violations in this photo.
- Separation Requirements: According to NEC 725.55(A), Class 2 wiring (24 Vac thermostat wiring) cannot be installed in the same raceway, wormhole, or enclosure as power wiring. However, if the two systems are connected to the same equipment, the Class 2 wiring must be separated by a barrier or kept 1/8" apart within the box (NEC 725.55(D)).
The box in your photo has both class 1 & class 3 wires in the same box without any separation.
- Reclassification To reclassify a Class 2 circuit, it must meet Class 1 requirements, including insulation, conductor size, and material. This may involve using line-voltage-rated materials and ensuring the circuit is designed and installed according to Class 1 standards.
With this information, you may want to have an electrician look at removing the thermostat from inside that electrical box.
Edward Young Retired
After you make that expensive repair and you still have the same problem, What will you check next?
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