Installing a roll over switch sensor in Teledyne-Laars LP boiler ?

FreezinFayston

I have an old model that didn’t come with a roll over switch. In installing one, do I take one wire from the gas valve 24 volt tabs and wire it thru the switch and back ?

SuperTech

Yeah you want it to break power to the gas valve. How old is the boiler? Most boilers do not have a resettable rollout switch, they usually have a fusible link

FreezinFayston

Thank you ! The boiler is circa 1990. I purchased the after market reset able roll over switch to add on for safety.

HVACNUT

https://forum.heatinghelp.com/discussion/205245/installing-a-roll-over-switch-sensor-in-teledyne-laars-lp-boiler

This is a Rollout switch.

Check the diagram of a more recent revision of your model boiler and install it in the same location. You will need wire rated for high temperature.

And this is a Spill switch.

If your boiler doesn't have one, do it as well. For that you can use typical 18/2 low volt wire.