A refrigeration system contains 30 kg of an A1 refrigerant. Which of the following system locations does NOT require a stop valve, according to CSA B52 code?
a. Suction inlet of each compressor
b. Discharge outlet of each compressor
c. Suction inlet of each condensing unit
d. Discharge outlet of each condensing unit
e. Suction inlet of each liquid receiver
Answer: E