Installation and operation manual
12
10T8Y1B
VRV-W IV System Air Conditioner
4P399208-1 – 2015.01
9.5.
System piping (length) limitations
Piping length restrictions
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.
Definitions
Actual piping length: pipe length between outdoor
(1)
and indoor units.
Equivalent piping length
(2)
: pipe length between outdoor
(1)
and
indoor units.
Total piping length: total piping length from the outdoor
(1)
to all indoor
units.
Difference in height between outdoor and indoor units: H1
Difference in height between indoor and indoor units: H2
Difference in height between outdoor and outdoor units: H3
(1)
If the system capacity is >10HP, re-read "the first outdoor branch as seen
from the indoor unit".
(2)
Assume equivalent piping length of Refnet joint=0.5 m, Refnet
header=1 m, BSVQ100/160=4 m and BSVQ250=6 m (for calculation
purposes of equivalent piping length, not for refrigerant charge
calculations).
