Reinstalling brass immersion well


  #1  
Old 08-27-19, 10:35 AM
A
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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.
 
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Old 08-27-19, 05:31 PM
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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.
 
 

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