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EQUIVALENT LENGTH ALLOWANCE FOR FITTINGS
GENERAL:
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.
4.
A "P" trap must be installed at the bottom of the riser in all vertical suction lines rising 4" or
more. To insure 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
.
5/16 Rev. B 57-02497
EQUIVALENT LENGTH IN FEET
FITTING
90°
SIZE
Ell
1/2"
.9
5/8"
1.0
7/8"
1.5
1-1/8"
1.8
1-3/8"
2.4
1-5/8"
2.8
2-1/8"
3.9
Chart A
45°
Tee
Ell
(Line)
(Branch)
.4
.8
.5
1.0
.7
1.5
.9
1.5
1.2
1.8
1.4
2.0
1.8
3.8
Tee
2.0
2.5
3.5
4.5
6.0
7.0
10.0
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