Final answer:
When charging an R-11 system, the first step is to charge the unit with refrigerant vapor to prevent premature condensation and ensure proper functioning.
Step-by-step explanation:
When charging an R-11 system, the first step is to charge the unit with refrigerant vapor so that the refrigerant does not condense into a liquid prematurely. This is done to prevent damage to the system and ensure proper functioning. Charging the system with vapor allows the refrigerant to flow through the components and absorb heat from the environment before it condenses.
When charging an R-11 system, the first step is to charge the unit with refrigerant vapor to prevent liquid slugging of the compressor. Compressors are designed to compress gases, not liquids. Liquid slugging can occur when liquid refrigerant enters the compressor, leading to mechanical damage or failure. The refrigeration cycle starts with a compressor that increases the temperature and pressure of the refrigerant gas, which is then condensed inside the heated space's condenser coils. This heat transfer to the room causes the gas to condense into a liquid. Afterwards, this liquid passes through an expansion valve and returns to the outdoor evaporator coils, being cooled and ready to absorb more heat. In reverse cycles like heat pumps, this process provides heating to the interior space.