Nor-Lake Refrigeration Systems - Manual (Page 10)

09/14 Rev. E 101628 10
TABLE 4
– Recommended Line Sizes for R-134A Refrigerant
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.