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6/21 57-02611 ©2021, Refrigerated Solutions Group™. All rights reserved. 23
EQUIVALENT LENGTH ALLOWANCE FOR FITTINGS
EQUIVALENT LENGTH IN FEET
FITTING
90°
45°
Tee
Tee
SIZE
Ell
Ell
(Line)
(Branch)
1/2" .9 .4 .8 2.0
5/8" 1.0 .5 1.0 2.5
7/8" 1.5 .7 1.5 3.5
1-1/8" 1.8 .9 1.5 4.5
1-3/8" 2.4 1.2 1.8 6.0
1-5/8" 2.8 1.4 2.0 7.0
2-1/8"
3.9
1.8
3.8
10.0
Chart A
GENERAL INFORMATION
1. Suction lines should be pitched down in direction of flow, 1/2" per 10 feet of line.
2. Refrigerant lines should be supported and fastened properly to prevent leaks and for
professional looking installation. Supports should be every 5 feet for lines to 7/8" OD, 7 feet
for 1-1/8" to 1-3/8" OD lines, and 10 feet for 1-5/8" and 2-1/8" OD lines.
3. Where condensation dripping would be objectionable, insulate suction lines, and where the
sun could adversely affect performance, insulate both the liquid and suction lines. Insulation
thickness of 1/2" will usually be adequate. Liquid line should be insulated for reverse cycle
defrost as well
4. A “P” trap must be installed at the bottom of the riser in all vertical suction lines rising 4" or
more. To ensure proper oil return to the condensing unit, the trap should be the same size as
the horizontal line and the riser should be sized per the line sizing charts on pages 14-17.
In installations where condensate can accumulate on the vibrasorber, a covering of heat shrink
PVC tubing or waterproof tape may be used to prevent freezing under the ferrule, causing a
rupture.
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