94 | LIMITS / PLACEMENT
MULTI V 5 Outdoor Unit Engineering Manual
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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:
Figure 27: Y-branch Measurement Location.1. Measurements.
All measurements should be made from the union center of the outdoor unit Y-branch.
Figure 28: Maximum Pipe Length from First Outdoor
Unit Y-branch to Farthest Outdoor Unit.
To IDUs / HRUs
33 Feet
(Max.)
Figure 29: Elevation Difference Between Outdoor
Units.
Figure 30: Traps for Heat Pump and Heat Recovery Systems.
To IDUs /
HRUs
Elevation
16 Feet
(Max)
Oil Trap
8 inches
Trapping
1. :KHQUHTXLUHGDOOWUDSVPXVWEHLQYHUWHGW\SHWUDSVƎLQWKHYDSRUOLQHV
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.
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horizontal pipe it elevates from.
2. 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.
3. Elevation difference between outdoor units.
The elevation difference between the highest and lowest elevation outdoor unit must
not exceed sixteen (16) feet.
Figure 31: Close Up of An Inverted Oil Trap.
Suction
Liquid
Elevation
Heat Pump
Low Pressure Vapor
Liquid
To Indoor Units
Elevation
Heat Recovery
High Pressure Vapor
To Indoor Units
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