Panasonic U-8ME4XPQM Manuel D'installation page 10

3.1 Precautions when connecting piping between outdoor
units (multiple outdoor unit system)
To connect the piping between outdoor units, an optional
multi connection piping kit CZ-32/48PJ5PQ is always
required. When installing the piping, follow the instructions in
the installation manual that comes with the kit.
Only proceed with piping work after considering the
limitations on installing listed here and in the chapter
"6.4. Connecting the refrigerant piping" on page 6, always
referring to the installation manual delivered with the kit.
3.2 Possible installation patterns and configurations
The piping between the outdoor units must be routed level or
slightly upward to avoid the risk of oil retention into the piping
side.
Pattern 1
1
1 To indoor unit
Pattern 2
1
1 To indoor unit
Prohibited patterns: change to pattern 1 or 2.
1
2 3
1 To indoor unit
2 Piping between outdoor units
3 Oil remains in piping
To avoid the risk of oil retention to the outmost outdoor unit,
always connect the stop valve and the piping between
outdoor units as shown in the 4 correct possibilities of the
figure below.
Installation manual
7
1
1
1
3
2
Prohibited patterns: change to pattern 1 or 2.
2 2 2
1
1 To indoor unit
2 Oil remains in piping
Change to configuration as in figures below
1
2
1 To indoor unit
2 Oil remains in piping when the system stops.
Correct configuration
1
1 To indoor unit
If the piping length between the outdoor units exceeds 2 m,
create a rise of 200 mm or more in the suction gas line and
high pressure/low pressure gas line within a length of 2 m
from the kit.
If ≤2 m
-
1
≤2 m ≤2 m
2
1 To indoor unit
2 Suction gas and HP/LP gas piping between outdoor
units
If ≥2 m
-
1
≤2 m
2
≥2 m
1 To indoor unit
2 Suction gas and HP/LP gas piping between outdoor
units
2 2 2
1
2
1
2
1
1
1
≤2 m
≥2 m
U-8~16ME4XPQM
Urban Multi air conditioner
4PW40728-1