Daikin REYQ96MTJU, Design, Installation & Testing Instruction

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Appendix Si39-406
102 General Information
7.2.2 Branch with refnet joint and refnet header
(Connection of 8 indoor units Heat pump system)
One outdoor
unit installed
Branch with refnet joint and refnet header
( ~ , . )
H1
a
c e
f
j
l
i
h
k
g
d
b
m
n
p
o
H2
REFNET joint ( . )
REFNET header
Outdoor unit
5 6
Cooling only
BS unit
B1 B5
( ~ )
1 4 7 8
Indoor unit
Cool/Heat selection possible
1 8
( ~ )
B1 B2 B3 B4
B5
1 2 3 4 5 6 7
8
( . )
A
A
B
B
Maximum
allowable
length Between outdoor
and indoor units
• Actual pipe length
Pipe length between outdoor and indoor units
≤
330ft.
Example unit 6: a + b + i
≤
330ft., unit 8: a + m + n + p
≤
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
height
length
Between outdoor and indoor units
• Difference in height
Difference in height between outdoor and indoor units (H1)
≤
164ft.
(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.
Allowable
length after
the branch • Actual pipe length
Pipe length from first refrigerant branch kit (either refnet joint or refnet header) to indoor unit
≤
130ft.
Example unit 6: b + i
≤
130ft., unit 8: m + n + p
≤
130ft.