What are two differences between R404A and R477 (CO2) piping for the same evaporator temperature and system Btuh capacity?
a. R404A piping must withstand lower pressure and is a smaller diameter than R477
b. R477 piping must withstand higher pressure, but has smaller diameter than R404A
b. R477 piping must withstand higher pressure, but has smaller diameter than R404A
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