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How (and Why) to Flow Nitrogen While Brazing

When I started in the trade, the idea of flowing nitrogen while brazing was nothing more than the punchline of a joke. L

Does Air or Nitrogen Absorb Water?

There are many examples of teaching using metaphors to help someone grasp how something works without being EXACTLY corr

Using Heat & Nitrogen In Vacuum

In these tips and on the podcast, we talk a lot about the importance of deep vacuum. Pulling a deep vacuum using proper

Start Flowing Nitrogen Sooner

My technician (and brother-in-law), Bert, made a good point. (It's hard for me to admit it, but it's true.) When he need

Sweeping with Nitrogen

Two days prior to this article being published, I sent one out about the popular fallacy that nitrogen “absorbs

Non-Bleed TXV & Trapped Nitrogen

The following is based on a true story. No product was harmed in the making of this tech tip, and some facts may have ch

Triple Evacuation and Nitrogen FACTS

This article was written by longtime contributor and RSES CM Jeremy Smith. Thanks, Jeremy! Nitrogen doesn’t absorb moist

Does Nitrogen Pressure Change with Temperature – Practical Application of Gas Laws

The gas laws. We all learned about them in school and promptly forgot all about them. I really think that we need to dig

Properly Deburring (Reaming)

Deburring copper tubing (often called reaming) is the practice of running a blade around the inside of tubing after you

Which Valve Do I Open First?

Testo 557 vacuum gauge and Appion core removal tools shown I've had a change of heart. Back in the early 2000s, during t

Testing, Recovery, and Charging a Sealed System

There are many appliances with compression refrigeration circuits that do not have ports installed for testing, recovery

How Attic Designs Need to Account for Heat and Moisture

This tech tip was heavily inspired by one aspect of Rick Sims’s 2021 HVACR Training Symposium session titled “Conductsat