Daikin VRV 5 RXYA8A7Y1B, Инструкция по установке и эксплуатации

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18 | Piping installation
Installer and user reference guide
100
RYMA5+RXYA8~20A7Y1B
VRV 5 heat pump
4P749918-1 – 2023.12
Pipe Maximum length (actual/equivalent)
Total pipe length 1000 m/—
500 m/—
(b)
(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 size" [
4
91].
(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.
Connection with only one air handling unit
Pipe Maximum length (actual/equivalent)
Longest pipe from the outdoor unit or
the last multi-outdoor piping branch 50 m/55 m
(a)
In case of a multi-outdoor setup:
longest pipe from the outdoor unit to
the last multi-outdoor piping branch 10 m/13 m
(a)
The allowable minimum length is 5 m.
18.1.9 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
a
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.