Why is a check valve installed in the suction line of the lowest-temperature coil in a multiple-evaporator system?
A) To allow the coil to be isolated from other evaporator coils when checking the operating of the evaporator pressure regulator
B) To prevent refrigerant migration from the higher-temperature-and-pressure coil to the lower-temperature and-pressure coil
C) To ensure that the refrigerant is completely vaporized before leaving the evaporator
D) To allow the service technician to check the operation of the system
B
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