Selection Of Refrigerant Branch Kits; System Piping (Length) Limitations - Daikin VRV RXYQ72AATJ Series Installation Manual

7.4. Selection of refrigerant branch kits

For piping example, refer to 7.3. Selection of piping size on page 10.
• When using REFNET joints at the first branch from the outdoor
units, choose from the following table in accordance with the capac-
ity of the outdoor unit (example: REFNET joint a - see 7.3. Selection
of piping size).
Outdoor unit capacity type
RXYQ72, 96A type
RXYQ120-216A type
RXYQ240-480A type
• For REFNET joints other than the first branch (example REFNET
joint b - see 7.3. Selection of piping size), select the proper branch
kit model based on the total capacity of all indoor units connected
after the refrigerant branch.
Indoor unit
capacity index
<72
72≤×<111
111≤×<246
≥246
• Concerning REFNET headers, choose from the following table in
accordance with the total capacity of all the indoor units connected
after the REFNET header.
Indoor unit
capacity index
KHRP26M22H9/KHRP26M22HA:
maximum 4 indoor units
<72
KHRP26M33H9/KHRP26M33HA:
maximum 8 indoor units
72≤×<111
111≤×<230
≥230
INFORMATION
Maximum 8 branches can be connected to a header.
English
Kit name
KHRP26A33T9
KHRP26A33TA
KHRP26M72TU9
KHRP26M72TUA
KHRP26M73TU9
KHRP26M73TUA
Kit name
KHRP26A22T9
KHRP26A22TA
KHRP26A33T9
KHRP26A33TA
KHRP26M72TU9
KHRP26M72TUA
KHRP26M73TU9
KHRP26M73TUA
Kit name
or
KHRP26M33H9
KHRP26M33HA
KHRP26M72H9
KHRP26M72HA
KHRP26M73HU9
KHRP26M73HUA
INFORMATION
The piping branch by REFNET joints is possible in the downstream of
REFNET headers. Indoor unit total capacity at REFNET joints accord-
ing to the REFNET header are as follows.
REFNET header
Indoor unit
(Downstream of REFNET joint)
REFNET Header
KHRP26M22H9
KHRP26M22HA
KHRP26M33H9
KHRP26M33HA
KHRP26M72H9
KHRP26M72HA
KHRP26M73HU9
KHRP26M73HUA
• If the outdoor unit capacity type is 264 or more, an outdoor multi
connection piping kit and reducer piping kit are always required.
Description
Outdoor unit multi connection
piping kit
Reducer piping kit

7.5. System piping (length) limitations

7.5.1. Piping length restrictions
Make sure to perform the piping installation within the range of the
maximum allowable pipe length, allowable height difference and al-
lowable length after branching as indicated below. 3 patterns will be
discussed, including VRV indoor units combined with Mini-split indoor
units.
Definitions
• Actual piping length: pipe length between outdoor*1 and indoor
units.
• Equivalent piping length: pipe length between outdoor*1 and indoor
units. (Assume equivalent piping length of REFNET joint = 1.6 ft.
(0.5 m) and REFNET header = 3.3 ft. (1 m) (for calculation purposes
of equivalent piping length, not for refrigerant charge calculations).)
• Total piping length: total piping length from the outdoor*1 to all
indoor units.
*1 If the system capacity type is > 240, the distance will be from the
first outdoor unit branch to indoor units.
REFNET joint
Indoor unit
Indoor unit total capacity at
REFNET joint
<18
≤54
Model name
BHFP22P100U
BHFP22P100UA
KHFP26P100UA
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