HVAC LEVEL 2 MODULE 3 EXAM QUESTIONS AND ANSWERS(UPDATED!)

Using steel piping in a refrigeration systems that use ammonia will prevent? - ANSWERCorrosion What characteristics must a refrigerant have if it as used as a drop in replacement for another refrigerant ? - ANSWERSimilar operating pressures and temperatures. What is commonly done when a drop in refrigerant is placed in operating equipment. - ANSWEROil is being replaced. Which refrigerant will likely become scares after the year 2020 - ANSWERHCFC 123- is considered 245 refrigerant. The refrigerant that has primarily replaced cfc 12 is? - ANSWERHFC 134a Which substance is not found in cfc refrigerants ? - ANSWERHydrogen Which substance in refrigerants is most responsible for atmospheric ozone depletion ? - ANSWERChlorine. What must be done when charging a zeotropic refrigerant into a operating system? - ANSWERYour charging liquid in a metering orifice on the low pressure side.