Final answer:
After system servicing, the refrigerant vapor is reintroduced to the chiller before the refrigerant liquid, which can cause water in the heat exchanger tube bundle to freeze. This is part of the refrigeration cycle where the refrigerant is compressed, condensed, and then expands to cool the surroundings.
Step-by-step explanation:
In a refrigeration system, after the system servicing, the refrigerant vapor is reintroduced to the chiller before the refrigerant liquid. This is because when the liquid refrigerant is charged into a deep vacuum, it will evaporate and lower the temperature, leading to the freezing of water in the heat exchanger tube bundle.
This process is an integral part of the refrigeration cycle, where the electrically driven compressor raises the temperature and pressure of the gas refrigerant, which then condenses to a liquid in the condenser coils. The liquid refrigerant flows back to the evaporator coils after passing through a pressure-reducing valve, where it expands and cools, causing the refrigerant to evaporate and absorb heat from the surroundings.