14 Piping installation
Installation and operation manual
20
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ heat pump
4P546220-1C – 2020.10
RYMQ8+RYMQ18.
Largest
connection
is
Ø28.6
(RYMQ18); Ø22.2 (RYMQ12) and Ø19.1 (RYMQ8). In figure below
only equalising pipe is shown.
Ø22.2 mm
Ø28.6 mm
Ø19.1 mm
INFORMATION
Reducers or T-joints are field supplied.
NOTICE
Refrigerant branch kits can only be used with R410A.
14.1.4
Multiple outdoor units: Possible layouts
▪ The piping between the outdoor units must be routed level or
slightly upward to avoid the risk of oil retention into the piping.
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
NOT allowed (oil remains in piping)
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
NOT allowed (oil remains in piping)
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
>2 m
a
≤2 m
≤2 m
≥200 mm
≥200 mm
b
>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
B
C
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)
14.2
Connecting the refrigerant piping
14.2.1
To route the refrigerant piping
Installation of refrigerant piping is possible as front connection or
side connection (when taken out from the bottom) as shown in the
figure below.
a
b
c
a
Left-side connection
b
Front connection
c
Right-side connection
For side connections, the knockout hole on the bottom plate should
be removed:
