Daikin VRV REYQ96MTJU Design, Installation & Testing Instruction page 109

Si39-406
7.2.3 Branch with refnet header
(Connection of 8 indoor units Heat pump system)
Between outdoor
Maximum
and indoor units
allowable
length
• Actual pipe length
Pipe length between outdoor and indoor units ≤ 330ft.
Example unit 6: a + o ≤ 330ft.
• Equivalent length
Equivalent pipe length between outdoor and indoor units ≤ 390ft.
(assume equivalent pipe length of refnet joint to be 1.6ft., that of refnet header to be 3.3ft.,
calculation purposes)
• Total extension length
Total piping length from outdoor unit* to all indoor units ≤ 950ft.
Allowable Between outdoor and indoor units
• Difference in height
height
Difference in height between outdoor and indoor units (H1) ≤ 164ft.
length
(Max 130ft. if the outdoor unit is below)
Between indoor and indoor units
• Difference in height
Difference in height between adjacent indoor units (H2) ≤ 49ft.
• Actual pipe length
Allowable
Pipe length from first refrigerant branch kit (either refnet joint or refnet header) to indoor unit ≤ 130ft.
length after
Example unit 8: o ≤ 130ft.
the branch
General Information
One outdoor
unit installed
BS unit
Indoor unit
Cool/Heat selection possible
Branch with refnet header
Outdoor unit
a
b d f
B1 B2 B3
( ~ )
B1 B6
c e g i
( ~ )
1 2 3
1 8
( ~ )
1 6
REFNET header
h j l n
o
B4 B5 B6
k m
4 5 6 7
H2
8
.
Cooling only ( )
7 8
Appendix
H1
103