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LAYOUT BEST PRACTICES
General Information / Guidelines
2. Inverted traps are required when:
a. Piping in a horizontal direction from the outdoor Y-branch towards an out-
door 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).
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.
Figure 42: Inverted Trap Applications.
To IDUs /
HRUs
Oil Trap
To IDUs / HRUs
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.
144 |
p
Oil Trap
Oil Trap
©
Figure 41: Examples of Inverted Traps.
To IDUs / HRUs
Us
Oil Trap
Figure 43: Allowable Pipe Slope.
Toward indoor unit
Oil Trap
Oil T
Oil Trap
-10°

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