Multiple Outdoor Units: Possible Layouts - Daikin VRV 5 RXYA8A7Y1B Installer And User Manual

18 | Piping installation
Connection with only one air handling unit

18.1.9 Multiple outdoor units: Possible layouts

Installer and user reference guide
100
Pipe
Total pipe length
(a)
If the equivalent piping length is more than 90 m, size up the main piping according to
"18.1.4 To select the piping
(b)
In case of multi-outdoor-unit combinations.
(c)
The limitation can be extended to 90 m if the following conditions are met:
• The piping length between all indoor units and the SV unit is ≤40 m.
• Size-up:
→ It is required to size-up both liquid and gas piping between the first branch kit or SV unit and the
last branch kit or last SV unit. The size-up pipe cannot be larger than Ø28.6 mm.
→ It is not required to size-up the piping between the SV unit and indoor units.
→ If the increased pipe size is larger than the pipe size of the main pipe, also increase the size of the
main pipe.
• In case of size-up of the piping, double its length in the calculation of the total piping length. Make
sure the total piping length is within limitations.
• The piping length difference between the nearest indoor unit to the outdoor unit and the farthest
indoor unit to the outdoor unit is ≤40 m.
Pipe
Longest pipe from the outdoor unit or
the last multi-outdoor piping branch
In case of a multi-outdoor setup:
longest pipe from the outdoor unit to
the last multi-outdoor piping branch
(a)
The allowable minimum length is 5 m.
▪ 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
a
b
a
b
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 correct ( )
possibilities of the figure below.
Maximum length (actual/equivalent)
4
size" [ 91].
Maximum length (actual/equivalent)
1000 m/—
(b)
500 m/—
(a)
50 m/55 m
10 m/13 m
Pattern 2
a
b
a
b
a
b
RYMA5+RXYA8~20A7Y1B
VRV 5 heat pump
4P749918-1 – 2023.12