To avoid liquid slugging in a direct expansion evaporator after shutting down a reciprocating or rotary compressor refrigerating system which of the following measures needs to be taken?
a. Pump down the evaporator
b. Drain the liquid from the evaporator into the high-side
c. Discharge the condenser refrigerant into the evaporator
d. Open all the suction valves on the connecting condenser line
e. Fill the evaporator with refrigerant vapour
Answer: A