Why should solderless type piercing valves NOT remain installed on refrigeration systems after completion of repairs?

Secure attachment makes a toddler  

When is it essential to take measures to help release trapped CFC, HCFC, or HFC refrigerant from the compressor oil during refrigerant recovery?

Which of the following statements about R-1233zd is FALSE?

Which of the following statements about recycling and recovery equipment used for stationary refrigeration is FALSE?

When R-410A is recovered from an appliance, it;

what is a deep vacuum usually measured in?

What should systems that use R-407C be leak checked with?

when could a reciprocating compressor can be damaged if energized?

A rupture disc on a recovery vessel for low-pressure refrigerants relieves at;