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Split System Models
Table 23 Equivalent lengths (feet) for various pipe fittings
Copper Pipe | 90 Degree | 90 Degree | 45 Degree |
| Gate | Globe | Angle |
OD in. | Elbow Copper | Elbow Cast | Elbow | Tee | Valve | Valve | Valve |
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1/2 | 0.8 | 1.3 | 0.4 | 2.5 | 0.26 | 7.0 | 4.0 |
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5/8 | 0.9 | 1.4 | 0.5 | 2.5 | 0.28 | 9.5 | 5.0 |
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3/4 | 1.0 | 1.5 | 0.6 | 2.5 | 0.3 | 12.0 | 6.5 |
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7/8 | 1.45 | 1.8 | 0.8 | 3.6 | 0.36 | 17.2 | 9.5 |
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1.85 | 2.2 | 1.0 | 4.6 | 0.48 | 22.5 | 12.0 | |
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2.4 | 2.9 | 1.3 | 6.4 | 0.65 | 32.0 | 16.0 | |
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2.9 | 3.5 | 1.6 | 7.2 | 0.72 | 36.0 | 19.5 | |
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Refrigerant trap = 4 times equivalent length of pipe per this table
Figure 19 Refrigerant piping diagram
Evaporator
Suction Line Piping Condensing unit below evaporator
Pitch down 1/2" (13mm) per 10 ft. (3m)
NOTE
When remote condensing units are installed below the evaporator, the suction gas line should be trapped with an inverted trap to the height of the evaporator. This prevents refrigerant migration to the compressors during off cycles. Maximum recommended vertical drop to condensing unit is15 ft. (4.6m).
Evaporator
Condensing
Unit
Condensing
Unit
Suction Line Piping
Condensing unit above evaporator .
Traps recommended at the base of riser and every 25 feet (7.6m) of vertical rise.
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