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MUL
TI V 5 Outdoor Unit Installation Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
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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:
Y-branch Measurement Location.
1. Measurements.
All measurements should be made from the union center of the outdoor unit Y-branch.
PLAN VIEW
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.
Maximum Pipe Length from First Outdoor Unit
Y-branch to Farthest Outdoor Unit.
To IDUs / HRUs
33 Feet
(Max.)
Elevation Difference Between Outdoor Units.
Close Up of An Inverted Oil Trap.
To IDUs /
HRUs
Elevation
16 Feet
(Max)
Traps for Heat Pump and Heat Recovery Systems.
Suction
Liquid
Elevation
Heat Pump
Low Pressure Vapor
Liquid
To Indoor Units
Elevation
Heat Recovery
High Pressure Vapor
To Indoor Units
Oil Trap
≥
8 inches
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.
