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Split System Models
41
Figure 19 Refrigerant piping diagram
Table 23 Equivalent lengths (feet) for various pipe fittings
Copper Pipe
OD in.
90 Degree
Elbow Copper
90 Degree
Elbow Cast
45 Degree
Elbow Tee
Gate
Valve
Globe
Valve
Angle
Valve
1/2 0.8 1.3 0.4 2.5 0.26 7.0 4.0
5/8 0.9 1.4 0.5 2.5 0.28 9.5 5.0
3/4 1.0 1.5 0.6 2.5 0.3 12.0 6.5
7/8 1.45 1.8 0.8 3.6 0.36 17.2 9.5
1-1/8 1.85 2.2 1.0 4.6 0.48 22.5 12.0
1-3/8 2.4 2.9 1.3 6.4 0.65 32.0 16.0
1-5/8 2.9 3.5 1.6 7.2 0.72 36.0 19.5
Refrigerant trap = 4 times equivalent length of pipe per this table
Evaporator
Condensing
Unit
Evaporator 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.
Suction Line Piping
Condensing unit
below evaporator
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 is 15 ft. (4.6m).
Pitch down 1/2" (13mm) per 10 ft. (3m)