Nor-Lake Refrigeration Systems User Manual

Page 11

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09/14 Rev. E 101628

TABLE 4

– Recommended Line Sizes for R-134A Refrigerant (Continued)

Note:



Sizes that are highlighted indicate maximum suction line sizes that should be used for risers. Riser size should not

exceed horizontal size. Properly placed suction traps must also be used for adequate oil return.



All sizes shown are for O.D. type L copper tubing.



Suction line sizes selected at pressure drop equivalent to 2°F reduce estimate of system capacity accordingly. If

system load drops below 40% of design, consideration to install double suction risers should be made.



Consult factory for R-134a operation at winter conditions below 0° ambient. Heated and insulated receiver
required below 0° ambient. If system load drops below 40% of design, consideration to installing double
suction risers should be made.