About The Piping Length; Piping Length: Vrv Dx Only - Daikin VRV IV+ Installer And User Reference Manual

5.3.4 About the piping length

5.3.5 Piping length: VRV DX only

RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ heat pump
4P546228-1A – 2019.10
There is never a connection of the equalising pipe with the indoor units.
Example: (free multi combination)
RYMQ8+RYMQ12+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
INFORMATION
Reducers or T-joints are field supplied.
NOTICE
Refrigerant branch kits can only be used with R410A.
Make sure to perform the piping installation within the range of the maximum
allowable pipe length, allowable level difference and allowable length after
branching as indicated below. Three patterns will be discussed, including VRV DX
indoor units combined with Hydrobox units or RA DX indoor units.
Definitions
Term
Actual piping length
Equivalent piping length
Total piping length
H1
H2
H3
H4
H5
H6
(a) If the system capacity is a multi outdoor installation, re-read "the first outdoor
branch as seen from the indoor unit".
(b) Assume equivalent piping length of refnet joint=0.5 m and refnet header=1 m (for
calculation purposes of equivalent piping length, not for refrigerant charge
calculations).
For system only containing VRV DX indoor units:
Ø19.1 mm
Pipe length between outdoor
(b)
Pipe length between outdoor
Total piping length from the outdoor
units.
Difference in height between outdoor and indoor
units.
Difference in height between indoor and indoor
units.
Difference in height between outdoor and outdoor
units.
Difference in height between outdoor and BP unit.
Difference in height between BP unit and BP unit.
Difference in height between BP unit and RA DX
indoor unit.
5 Preparation
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Definition
(a)
and indoor units.
(a)
and indoor units.
(a)
to all indoor
Installer and user reference guide
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