This is a procedure to clear the restrictions from the Carrier and Trane multiple orifice header assemblies that like to restrict with debris. Typically the debris are some sort of wax build up from the oil.
Initially I just rep[laced the restricted tiny OEM filter driers which were indeed so restricted that I could not blow through them.
Circuit #1 on this still had some restriction in the orifice header assembly. The suction pressure wasn't very low it was restricted enough to have over 30 degrees of superheat on a dry hot day.
So I pulled the charge again and performed this procedure to clear the orifices.
So far this has worked every time on a Carrier unit and today I was successful with a Trane unit as well.