SC Refrigeration Practice Questions - South Carolina Refrigeration Contractor Examination Exam

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A 5-ton R-404A suction line must run 80 ft equivalent length with two risers. The designer should select the tube size from a capacity table using 80 ft, then:

Always pick the largest listed size to minimize first cost of copper Verify that the selected size still produces adequate oil-return velocity in the risers at minimum expected load, stepping to a double riser if it does not Ignore risers because equivalent length already includes oil return Size the suction line equal to the discharge line

Correct Answer:

Verify that the selected size still produces adequate oil-return velocity in the risers at minimum expected load, stepping to a double riser if it does not

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