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Size up for equivalent length for outdoor-indoor units over 295 ft. (90 m)
Outdoor unit
Gas pipe
capacity type
3/4 in. (19.1 mm)
RXLQ72T type
→ 7/8 in. (22.2 mm)
7/8 in. (22.2 mm)
RXLQ96T type
→ 1 in. (25.4 mm)
RXLQ120T type
Increase is NOT allowed
RXLQ144T type
1-1/8 in. (28.6 mm)
→ 1-1/4 in. (31.8 mm)
RXLQ192T type
RXLQ240T type
Increase is NOT allowed
(a) If size is NOT available, increase is NOT allowed.
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
RXLQ 72, 96 T type
RXLQ 120-192 T type
RXLQ 240 T 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
< 72
72 ≤ × < 111
111 ≤ × < 230
≥230
11
Liquid pipe
3/8 in. (9.5 mm)
→ 1/2 in. (12.7 mm)
(a)
1/2 in. (12.7 mm)
→ 5/8 in. (15.9 mm)
(a)
5/8 in. (15.9 mm)
→ 3/4 in. (19.1 mm)
Kit name
KHRP26A33T9
KHRP26A33TA
KHRP26M72TU9
KHRP26M72TUA
KHRP26M73TU9
KHRP26M73TUA
Kit name
KHRP26A22T9
KHRP26A22TA
KHRP26A33T9
KHRP26A33TA
KHRP26M72TU9
KHRP26M72TUA
KHRP26M73TU9
KHRP26M73TUA
Kit name
KHRP26M22H9/
KHRP26M22HA:
maximum 4 indoor units
or
KHRP26M33H9/
KHRP26M33HA:
maximum 8 indoor units
KHRP26M33H9
KHRP26M33HA
KHRP26M72H9
KHRP26M72HA
KHRP26M73HU9
KHRP26M73HUA
INFORMATION
Maximum 8 branches can be connected to a header.
• How to choose an outdoor multi connection piping kit (needed if the
outdoor unit capacity type is 144 or more). Choose from the follow-
ing table in accordance with the number of outdoor units.
Number of outdoor units
2
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.
Definitions
Actual piping length: pipe length between outdoor
Equivalent piping length: pipe length between outdoor
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
units.
(1) If the system capacity type is > 120, the distance will be
from the first outdoor unit branch to indoor units.
Branch kit name
BHFP22P100U
BHFP22P100UA
and indoor units.
(1)
and indoor
(1)
to all indoor
(1)
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