Daikin VRV II Series - Page 118

Appendix Si39-303
112 General Information
7.3.3 Branch with refnet header
(Connection of 8 indoor units Heat pump system)
One outdoor
unit installed
(RXYQ5 ~16)
Branch with refnet header
When multiple
outdoor units
installed
(RXYQ18 ~ )
a
H1
H2
Outdoor unit
Refnet header
Indoor units (1-8)
cde
f
g
h
b
1234567
8
H2
8
H1
H3
a
Outdoor unit
Refnet header
Indoor units (1-8)
cde
f
g
h
b
1234567
Maximum
allowable
length
Between outdoor
and indoor units
• Actual pipe length
Pipe length between outdoor and indoor units
≤
150m
Example unit 6: a + i
≤
150m
• Equivalent length
Equivalent pipe length between outdoor and indoor units
≤
175m
(assume equivalent pipe length of refnet joint to be 0.5m, that of refnet header to be 1m,
calculation purposes)
• Total extension length
Total piping length from outdoor unit* to all indoor units
≤
300m
Between outdoor branch and indoor unit
(Only for RXYQ18 or more)
• Actual pipe length
Piping length from outdoor branch to outdoor unit
≤
10m
(Approximately length: max 13m)
Allowable
height
length
Between outdoor and indoor units
• Difference in height
Difference in height between outdoor and indoor units (H1)
≤
50m
(Max 40m if the outdoor unit is below)
Between indoor and indoor units
• Difference in height
Difference in height between adjacent indoor units (H2)
≤
15m
Between outdoor and outdoor units
• Difference in height
Difference in height between outdoor unit (main) and outdoor unit (sub) (H3)
≤
5m
Allowable
length after
the branch
• Actual pipe length
Pipe length from first refrigerant branch kit (either refnet joint or refnet header) to indoor unit
≤
40m
Example unit 8: i
≤
40m
*If the system capacity is RXYQ18 or more, re-read to
the first outdoor branch as seen from the indoor unit.
r
t
s
Outdoor unit
r ≤ 10m
s ≤ 10m
t ≤ 10m