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EDUS39-605
Installation
Installation of Outdoor Units
48
Cautions for installation of multiple outdoor units:
1.
The piping between the outdoor units must be routed level
or slightly upward to avoid the risk of oil detention to the pip-
ing side.
2.
To avoid the risk of oil retention to the end unit, always con-
nect the stop valve and the piping between outdoor units as
shown in the figure A or figure B
.
3.
If the piping length between the outdoor unit-connecting
pipe kits or between the outdoor units exceeds 80 in., cre-
ate a rise of 8 in. or more in the gas line within a length of
80 in. from the kit.
Pattern 1
Pattern 2
Prohibited pattern
Change to pattern 1 or pattern 2
to indoor unit
Piping between outdoor units
Piping between outdoor units
to indoor unit
to indoor unit
to indoor unit
to indoor unit
to indoor unit
Downward inclination
Downward inclination
Oil remains in piping
A
B
A
B
Prohibited pattern
to indoor unit
to indoor unit
Oil collects to the stopping outdoor unit.
Change to pattern 1 or pattern 2
Unit A
Unit B
Unit B
Unit A
to indoor unit
Change as shown in the figure below.
to indoor unit
to indoor unit
to indoor unit
Oil collects to the outdoor unit B when the system stops.
Rising height:
8 in. or more
If 80 in. or less
If 80 in. or more
Piping between outdoor units
Piping between
outdoor units
to indoor unit
80 in. or less
80 in. or less
80 in.
or more
Rising height:
8 in. or more