17 replies to this topic

[ProGodProGunProLife]

I urgently need 2 old analog thermostats replaced. The wiring is fairly heavy gage that doesn't seem to fit most modern thermostats.

[JackHass]

Most likely these thermostats are line voltage (110v). Your choices in line voltage programmable thermostats are limited. There is a Honeywell made one and a Lux brand one as well (both available at HD). Make sure they say "line voltage". You could convert to low voltage thermostats, but you would need to install something like a Taco brand zone relay where your boiler is located.

[rcpilot]

They use to make transformers that you install where the thermostat goes that allow you to use a low voltage thermostat. That's what I did for my downstairs zone.

[rlitman]

Whoever ran the wire to my upstairs thermostat used Romex, even though I have a 24V system. I connected the wires to smaller ones to make them work.

BTW, for a thermostat, you want an HVAC guy, not an electrician.

[ProGodProGunProLife]

Thanks for all your input!

I am going to try to upload some photos of the unit and the wiring. I was able to get the heat and hot water working but the upstairs thermostat control does not seem to work. It slides with no resistance, so I don't think it is controlling anything. I am going to ask the guy at the hardware store if he has a compatible replacement. If I can find the right unit, I think I can install it myself.

[ProGodProGunProLife]

Here are some photos of the front, inside of front cover and wiring.

[zzrguy]

Yet line voltage.

[Short Track Hunter]

Call an HVAC guy. They'll put in a 24v thermostat with a relay on the boiler. Get the Honeywell wifi. The app is amazing.

[phumb]

did you put a meter on it to see if really 110 and not 24?

[Short Track Hunter]

did you put a meter on it to see if really 110 and not 24?

It's obvious by looking at it. LINE VOLTAGE.

[rlitman]

It's obvious by looking at it. LINE VOLTAGE.

The upside down chart shows 120V and 240V.

[phumb]

It's obvious by looking at it. LINE VOLTAGE.

OK, the middle pic I totally could not read, the last pic, because it has 14 wire, means NOTHING

[fenucho]

Are we talking electric heat or boiler

[ProGodProGunProLife]

Are we talking electric heat or boiler

Boiler - oil furnace.

[ProGodProGunProLife]

So, I ended up getting a Lux 5 2 programable line voltage thermostat. Finally got it working.

Thanks to all for all your advice!

[leftjammer]

It's obvious by looking at it. LINE VOLTAGE.

This couldn't be more wrong.
Not everything is done to specs or code, and never assume when it comes to electricity.
A meter tells the truth (if you know how to use it)

[leftjammer]

So, I ended up getting a Lux 5 2 programable line voltage thermostat. Finally got it working.

Thanks to all for all your advice!

Cool beans.

Members helping members!!

[fenucho]

Glad you got it working.