REYQ8~16M8W1B
VRVII System air conditioner
4PW23712-1
Installation manual
6
Precautions when selecting branch piping.
If the overall equivalent piping length is
≥
90 m, be sure to enlarge the
main pipe in the liquid-side piping. Do not enlarge the main pipe in
the discharge-side and suction-side piping.
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 into the piping side.
Pattern 1
Pattern 2
Prohibited pattern: Change to Pattern 1 or 2
2.
To avoid the risk of oil retention to the stopping unit side, always
connect the stop valve and the piping between outdoor units as
shown in the figure A or figure B.
Prohibited pattern
Change to pattern 1 or 2
Change as shown in the figure below
3.
If the piping length between the outdoor unit-connecting pipe kits or
between the outdoor units exceeds 2 m, create a rise of 200 mm or
more in the gas line within a length of 2 m from the kit.
■
If
≤
2 m
■
If
≥
2 m
[Liquid side]
REYQ8+10
Ø9.5
➞
Ø12.7
REYQ12~16
Ø12.7
➞
Ø15.9
REYQ18~24
Ø15.9
➞
Ø19.1
REYQ26~48
Ø19.1
➞
Ø22.2
1
2
2
1
1
To indoor unit
2
Piping between outdoor units
1
1
1
To indoor unit
1
1
1
To indoor unit
A
B
B
A
A
Unit A
B
Unit B
C
Unit C
X
Not allowed
O
Allowed
1
To indoor unit
2
Oil collects to the stopping outdoor unit.
3
Oil collects to the outdoor unit C when the system stops.
1
To indoor unit
2
Piping between outdoor units
1
To indoor unit
2
Piping between outdoor units
1
1
2
2
2
2
2
2
1
1
A
B
C
C
A
B
3
3
1
1
≥
200 mm
1
≤
2 m
2
1
1
2
2
2
≤
2 m
≤
2 m
≤
2 m
≥
2 m
≥
200 mm
≥
200 mm
≥
200 mm
