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Piping installation
Installer and user reference guide
77
RWEYQ8~14T9Y1B
VRV IV water-cooled system air conditioner
4P452191-1B – 2020.10
Pattern 1
a
b
Pattern 2
a
b
a
b
a
b
a
To indoor unit
b
Piping between outdoor units
X
Not allowed (oil remains in piping)
O
Allowed
▪
If the piping length between the outdoor unit connecting pipe kit 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.
▪
For the gas piping (both discharge and suction gas piping in case of the heat
recovery system) after the branch, install a trap of 200 mm or more using the
piping included in the piping kit for connecting the outdoor unit. Otherwise, the
refrigerant may stay in the piping, causing damage to the outdoor unit.
≥200 mm
If
Then
≤2 m
≤2 m
b
a
>2 m
b
a
≤2 m
≤2 m
≥200 mm
≥200 mm
>2 m
>2 m
a
To indoor unit
b
Piping between outdoor units
NOTICE
There are restrictions on the refrigerant pipe connection order between outdoor
units during installation in case of a multiple outdoor unit system. Install according to
following restrictions. The capacities of outdoor units A, B and C must fulfill the
following restriction conditions: A≥B≥C.
a
c
b
A
B
C
a
To indoor units
b
Outdoor unit multi connecting piping kit (first branch)
c
Outdoor unit multi connecting piping kit (second branch)
