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Refrigerant Piping
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Pipe Layout
REFRIGERANT PIPING INSTALLATION
Figure 43: Examples of Inverted Traps.
1. Inverted traps are required when:
a. Piping in a horizontal direction from the outdoor Y-branch to-
wards 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).
Oil Trap
To IDUs/
HRUs
Oil Trap
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.
Oil Trap
Elevation
Elevation
Elevation
Oil Trap
To IDUs/
HRUs
To IDUs / HRUs
Oil Trap
Oil Trap
Oil Trap
Figure 44: Inverted Trap Applications.
Pipe Slope
Horizontal pipe slope should be level or slightly away from the water
source units, otherwise refrigerant and oil will migrate toward the
water source 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 water source unit Y-branch and before the pipe
slopes downward toward the water source unit.
Toward indoor unit
Elevation
-10°
Figure 45: Allowable Pipe Slope.
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