Daikin RXQ34PY1 [141/355] Branch with refnet header

Daikin RXQ18PY1 [141/355] Branch with refnet header
SiEN34-705 Appendix
General Information 135
7.3.3 Branch with Refnet Header
Heat Pump 50Hz/60Hz, Cooling Only 50Hz (RX(Y)Q5~54P, 50PH)
(Connection of 8 indoor units Heat pump system)
Single outdoor
system
(RX(Y)Q5 ~ 18P)
Example refrigerant branch using REFNET header
Multi outdoor
system
RX(Y)Q20P ~
RX(Y)Q16PH ~
a
H1
H2
cde
f
g
hi
b
123 456 7
8
Outdoor unit
Indoor units (1 - 8)
REFNET header
(
)
H2
8
H1
H3
a
cde
f
g
h
i
b
1234567
Outdoor unit
Indoor units ( 1 - 8)
REFNET header
Maximum
allowable
length
Between outdoor (*2) and indoor units
Actual pipe length
Pipe length between outdoor (*2) and indoor units 165m
Example unit 8: a + i 165m
Equivalent length
Equivalent pipe length between outdoor (*2) and indoor units 190m *(See Note 1)
(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 (*2) to all indoor units
1000m
Between outdoor unit and Outdoor unit multi connection piping kit
(Only for multi system)
Actual pipe length
Pipe length between outdoor unit and Outdoor unit multi
connection piping kit 10m
Equivalent length
Equivalent length between outdoor unit and Outdoor unit multi connection piping kit 13m
Allowable
height
length
Between outdoor and indoor units
• Difference in height
Difference in height between outdoor and indoor units (H1) 50m
( 90m 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 (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
*(See Note 2)
Example unit 8: i 40m
Refer Note 1 and Note 2 on page
143, 144.
*2 In case of multi outdoor system, re-read to the first Outdoor unit multi
connection piping kit as seen from the indoor unit.
r
t
s
r 10m (Equivalent length: 13m)
s 10m (Equivalent length: 13m)
t 10m (Equivalent length: 13m)
Outdoor unit

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