Reinstalling brass immersion well

Old 08-27-19, 10:35 AM
Thread Starter
Join Date: Apr 2007
Posts: 23
Received 0 Votes on 0 Posts
Reinstalling brass immersion well

While removing a sensor on an old American Standard Arcoliner boiler, I managed to loosen the immersion well leading to a slow drip. See this thread for pictures of the boiler.
  1. Do I need to drain the boiler to remove and reinstall the immersion well?
  2. Why do installation instructions for brass immersion wells say not to use Teflon tape? E.g., see these instructions. Search for "DO NOT USE TEFLON TAPE ON BRASS WELLS IN LWCO APPLICATIONS." What other sealants are recommended for this application?

There is no Low Water Cut Off on my boiler.
Old 08-27-19, 05:31 PM
Join Date: Nov 2011
Location: USA
Posts: 423
Received 3 Votes on 3 Posts
What kind of sensor did you remove?

Regarding the brass LWCO immersion well, I believe the reason for no Teflon tape is that there needs to be good electrical conductivity between the well threads and the boiler threads, based on the way the LWCO operates.

That is not the case with other kind of immersion wells that are used for thermal conductivity, like for example, an aquastat well, in which a sensor is inserted into the well for the purpose of sensing temperature.

Thread Tools
Search this Thread
Ask a Question
Question Title:
Your question will be posted in: