pipe connection on outside unit.

[txg]

New to the form. Homeowner question.
I had a ac tech install a york heat pump and he didn't use any flux when he brazed the connection. Is this normal practice?
Thanks txg

[rimek]

Yes, it can be normal with brazing alloys. There are some eutectic rods that have the flux on them already, and 45% needs flux, but most-dynaflow, 15- only need cleaning and, optimally, a nitrogen sweep during brazing. Soft solders require paste or acid(except in refrigeration systems) fluxes, but that's soldering, not brazing.

[txg]

Thank's for the reply.