Selection Of Refrigerant Branch Kits - Daikin VRV IV Manuel D'installation

7 .3 .2 . Piping between refrigerant branch kits: D
Choose from the following table in accordance with the indoor unit
total capacity type, connected downstream. Do not let the connec-
tion piping exceed the refrigerant piping size chosen by the general
system model name.
Piping outer diameter size
Indoor unit
capacity index
Gas pipe
< 54 5/8 in. (15.9 mm)
54 ≤ × < 72
3/4 in. (19.1 mm)
72 ≤ × < 111
7/8 in. (22.2 mm)
111 ≤ × < 162
1-1/8 in. (28.6 mm)
162 ≤ × < 230
230 ≤ × < 300
1-3/8 in. (34.9 mm)
> 300 1-5/8 in. (41.3 mm)
Example:
Downstream capacity for D = capacity index of unit 1 + capacity index
of unit 2
7 .3 .3 . Piping between refrigerant branch kit and indoor unit: E
Pipe size for direct connection to indoor unit must be the same as the
connection size of the VRV indoor unit.
Piping outer diameter size
Indoor unit
capacity index
Gas pipe
05, 07, 09, 12, 18 1/2 in. (12.7 mm)
24, 30, 36, 48, 54 5/8 in. (15.9 mm)
72 3/4 in. (19.1 mm)
96 7/8 in. (22.2 mm)
• When the equivalent pipe length between outdoor and indoor units
is 295 ft. (90 m) or more, the size of the main pipes (both gas side
and liquid side) must be increased. Depending on the length of the
piping, the capacity may drop, but even in such a case it is possible
to increase the size of the main pipes.
• Even as the length of the piping is less than 295 ft. (90 m), it is able
to increase the diameter of piping to improve performance.
1
1 Outdoor unit
2 Main pipes (outdoor unit to first refrigerant branch kit)
3 Increase
4 First refrigerant branch kit
5 Indoor unit
English
liquid pipe
3/8 in. (9.5 mm)
1/2 in. (12.7 mm)
5/8 in. (15.9 mm)
3/4 in. (19.1 mm)
liquid pipe
1/4 in. (6.4 mm)
3/8 in. (9.5 mm)
2 3 5
4
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)
RXYQ72T type
→ 7/8 in. (22.2 mm)
7/8 in. (22.2 mm)
RXYQ96T type
→ 1 in. (25.4 mm)
RXYQ120T type Increase is NOT allowed
RXYQ144T type
1-1/8 in. (28.6 mm)
→ 1-1/4 in. (31.8 mm)
RXYQ168-216T type
RXYQ240T type Increase is NOT allowed
1-3/8 in. (34.9 mm)
RXYQ264-336T type
→ 1-1/2 in. (38.1 mm)
RXYQ360-384T 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 9.
• 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
RXYQ 72, 96T type
RXYQ 120-216T type
RXYQ 240-384T 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
INFORMATION
Maximum 8 branches can be connected to a header.
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)
3/4 in. (19.1 mm)
(a)
→ 7/8 in. (22.2 mm)
kit name
KHRP26A33T9
KHRP26M72TU9
KHRP26M73TU9
kit name
KHRP26A22T9
KHRP26A33T9
KHRP26M72TU9
KHRP26M73TU9
kit name
KHRP26M22H9:
maximum 4 indoor units
or
KHRP26M33H9:
maximum 8 indoor units
KHRP26M33H9
KHRP26M72H9
KHRP26M73HU9
10