Longest Refrigerant Piping Run - Daikin VRV II Series Technical Data Manual

5 Easy and flexible design
5-4

Longest refrigerant piping run

VRVII
The ability to sustain refrigerant piping in lengths up to 150m (175m equivalent), allows systems to be designed with level differences of 50m between
indoor and outdoor units and 15m between individual indoor units. Thus, even with installations in 15 storey buildings, all outdoor units can be located
at rooftop level.
Actual piping
length
*1
Level difference
between indoor and
outdoor units
Level difference
between indoor
units
Piping length
between first
branch and furthest
indoor units
NOTES
1 In this case the outdoor unit is located above the indoor unit. If the outdoor unit is located underneath the indoor
unit the level difference is a maximum of 40m.
VRV-WII
• The water-cooled VRV-WII, uses water as its heat source and since there are no limitations on water piping length, is eminently suitable for application
to tall multi storey or large buildings. Considerable flexibility is available within the refrigerant circuit since up to 120m actual piping length and 50m*
(if the VRV-WII is above the indoor units) in height can exist between the VRV-WII and indoor units. Water piping does not intrude on the occupied
spaces, so there are no leakage problems.
• * 40m if the VRV-WII is below the indoor units.
VRV-WII
• VRVII & VRV-WII features
Actual piping
length 150 m
Equivalent piping
length 175 m
Actual piping length
between the VRV-WII and indoor units: 120m
(Equivalent piping length: 140m)
Level difference
between indoor units: 15m
Indoor installation
Water piping length depends on the heat source equipment
• Systems • VRVII & VRV-WII features
Water piping
Refrigerant piping
Level difference between the VRV-WII
and indoor units:
50m if the VRV-WII is above
40m if the VRV-WII is below
Actual piping
length 120 m
Equivalent piping
length 140 m
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