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MULTI V IV System Installation Manual
Due to our policy of continuous product innovation, some specications may change without notication.
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Pipe connection between outdoor units—standard length. Pipe connection between outdoor units when
length is ≤6-/58 feet.
Double and triple frame outdoor units should be installed with all components next to each other. In conditions when the double and triple
frame units need to be separated, see the rules demonstrated in the diagrams below.
Oil Trap installation between outdoor units when length is ≥6-5/8 feet.
• Oil could accumulate in an outdoor unit after operation has stopped if there is an elevation differential between the outdoor units, or if the
pipe distance between the outdoor units is >6-5/8 feet. Install an oil trap if any of these phenomena occur. Just one oil trap is necessary,
however, and only needs to be added to the vapor pipe line.
• If the pipe distance between the outdoor units is ≤6-5/8 feet, and if the main pipe is installed lower than the outdoor unit itself, an oil trap
does not have to be added.
Examples of improper
installation.
• If the main pipe is installed
higher than the outdoor unit,
oil can accumulate in the
outdoor unit when it is not
≤6-5/8 feet
.
To IDUs / HRUs
To IDUs / HRUs
To IDUs / HRUs
Maximum pipe length
after the first branch
between the outdoor units
is ≤33 feet
≤33 feet
Oil Tr ap
Oil Tr ap Oil Tr ap
≤6-5/8 feet
≥6-5/8 feet
• If the distance between the
outdoor units is >6-5/8 feet,
install an oil trap on the
vapor pipes.
• If the outdoor unit is
lower than the main
pipe, install an oil trap.
≥8 inches
≤6-5/8 feet
≤6-5/8 feet
≥6-5/8 feet ≥6-5/8 feet
Oil Trap
To IDUs / HRUs
To IDUs / HRUs
To IDUs / HRUs
Oil will accumulate in the
outdoor units if the main
pipe is installed higher
than the units themselves.
If there are height differences between the outdoor units,
oil will accumulate in the unit that is positioned lower than
the others.
To IDUs / HRUs
To IDUs / HRUs
operating.
• If there is an elevation differential between the outdoor
unit pipes, oil can accumulate in the lower-positioned
outdoor unit until operation has stopped.
Pipe Connections—Refrigerant Piping for Separated Outdoor Units
REFRIGERANT PIPING DESIGN
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