5
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Preparation
Installer and user reference guide
42
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ heat pump
4P546228-1A – 2019.10
Pattern 1
a
b
b
a
Pattern 2
b
a
a
b
a
b
b
aa
a
To indoor unit
b
Piping between outdoor units
X
Not allowed (oil remains in piping)
O
Allowed
▪
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.
a
b
b
b
a
b
b
b
a
b
a
b
a
b
a
a
a
≥200 mm
a
To indoor unit
b
Oil collects to the outmost outdoor unit when the system stops
X
Not allowed
O
Allowed
▪
If the piping length 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
Then
≤2 m
a
b
≤2 m
Summary of Contents for VRV IV+
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