Refrigerant Piping For Separated Outdoor Units - LG ARUM072BTE5 Installation Manual

REFRIGERANT PIPING FOR
SEPARATED OUTDOOR UNITS
Dual-frame and triple-frame systems should be installed with all outdoor units located next to each other. In conditions where the dual-frame
or triple-frame outdoor units need to be separated, the following rules must be followed:
1. Measurements.
All measurements should be made from the union center of the outdoor unit Y-branch.
1. Maximum pipe length from first outdoor unit Y-branch to farthest outdoor unit.
Total pipe length from the first outdoor unit Y-branch to the piping connection at the
farthest outdoor unit must not exceed thirty-three (33) feet.
2. Elevation difference between outdoor units.
The elevation difference between the highest and lowest elevation outdoor unit must
not exceed sixteen (16) feet.
Trapping
1. When required, all traps must be inverted type traps ≥8" in the vapor line(s).
a. Heat pump outdoor units would be trapped in the suction vapor line, and
heat recovery outdoor units would be trapped in the high AND low pressure
vapor lines.
b. Inverted traps are defined as any piping that is ≥8" in a vertical direction up the
horizontal pipe it elevates from.
Traps for Heat Pump and Heat Recovery Systems.
Heat Pump
Suction
Liquid
To Indoor Units
90
Heat Recovery
High Pressure Vapor
Low Pressure Vapor
Liquid
To Indoor Units
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Y-branch Measurement Location.
PLAN VIEW
Maximum Pipe Length from First Outdoor Unit
Y-branch to Farthest Outdoor Unit.
To IDUs / HRUs
33 Feet
(Max.)
Elevation Difference Between Outdoor Units.
16 Feet
(Max)
To IDUs /
HRUs
Close Up of An Inverted Oil Trap.
Oil Trap
≥8 inches