Final answer:
In Refrigerant Recovery, the technician should reduce the system pressure to a vacuum and ensure stability, indicating all refrigerant is removed. Additional recovery may follow if necessary. The cycle consists of compressing the refrigerant, condensing it by releasing heat, and then expanding it for cooling.
Step-by-step explanation:
During the process of Refrigerant Recovery, the technician should operate the recovery unit until the system pressure has been reduced to a vacuum, then continue monitoring the system to ensure that the pressure does not rise. This indicates that any residual refrigerant has been removed. Any rise in pressure could be from non-condensable gases or remaining refrigerant that was not initially recovered. Following this, the technician will ensure that the system is completely free of refrigerant by possibly performing additional recovery processes if necessary, before the system is opened for maintenance or repair.
The cooling cycle involves the continuous transformation of the refrigerant between gas and liquid states to transfer heat. In a typical refrigeration cycle, the electrically driven compressor (work input W) raises the temperature and pressure of the gas and forces it into the condenser coils where it condenses into a liquid by releasing heat. After condensation, the liquid passes through an expansion valve, and is then cooled further through expansion before being circulated back to the evaporator to absorb heat and complete the cycle.