LIMITS / PLACEMENT | 95
Piping Limitations and Placement Considerations
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REFRIGERANT PIPING FOR
SEPARATED OUTDOOR UNITS
b. Anytime piping turns downward leaving an outdoor unit Y-branch toward an outdoor unit or another outdoor unit Y-branch.
The inverted trap should be installed close to the outdoor unit Y-branch (no more than 6.6' away), and before the pipe toward the outdoor
unit turns downward.
1. Inverted traps are required when:
a. Piping in a horizontal direction from the outdoor Y-branch towards an outdoor unit or another outdoor unit Y-branch is greater than 6.6’.
The inverted trap should be installed close to the outdoor unit Y-branch (no more than 6.6’ away).
Figure 32: Examples of Inverted Traps.
Figure 33: Inverted Trap Applications.
Oil Trap
To IDUs / HRUs
Oil Trap
Oil Trap
Elevation
Elevation
Elevation
Oil Trap
To IDUs /
HRUs
To IDUs / HRUs
Oil Trap
Oil Trap
Oil Trap
Pipe Slope
Horizontal pipe slope should be level or slightly away from the
outdoor units, otherwise refrigerant and oil will migrate toward the
outdoor units and accumulate in the pipe segment serving the frame
that is not running or at the lowest elevation. Piping should never
slope more than -10° (see figure) without installing an inverted trap
within 6.6' of the outdoor unit Y-branch and before the pipe slopes
downward toward the outdoor unit.
Figure 34: Allowable Pipe Slope.
To indoor units /
heat recovery units
Elevation
-10°
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