10
3P362438-1B English
7 .3 .3 . Piping between refrigerant branch kit and BP unit: F
Pipe size for direct connection on BP unit must be based on the total
capacity of the connected indoor units (only in case Mini-split indoor
units are connected).
Total capacity index of
connected indoor units
Gas pipe
Liquid pipe
< 24
1/2 in. (12.7 mm)
1/4 in. (6.4 mm)
24 ≤
×
< 57
5/8 in. (15.9 mm)
3/8 in. (9.5 mm)
> 57
3/4 in. (19.1 mm)
Example:
Downstream capacity for F = capacity index of unit 4 + capacity index
of unit 5
7 .3 .4 . Piping between BP unit and Mini-split indoor unit: G
Only in case Mini-split indoor units are connected.
Indoor unit capacity index
Gas pipe
Liquid pipe
07, 09, 12
3/8 in. (9.5 mm)
1/4 in. (6.4 mm)
15, 18, 24
1/2 in. (12.7 mm)
7 .3 .5 . 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.
Indoor unit
capacity index
Piping outer diameter size
Gas pipe
Liquid pipe
07, 09, 12, 18
1/2 in. (12.7 mm)
1/4 in. (6.4 mm)
24, 30, 36, 48, 54
5/8 in. (15.9 mm)
3/8 in. (9.5 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
5
2
3
4
1 Outdoor unit
2
Main pipes (outdoor unit to first refrigerant branch kit)
3 Increase
4 First refrigerant branch kit
5 Indoor unit
Size up for equivalent length for outdoor-indoor units over 295 ft. (90 m)
Outdoor unit capacity
type
Gas pipe
Liquid pipe
RXYQ72T type
3/4 in. (19.1 mm)
→
7/8 in. (22.2 mm)
3/8 in. (9.5 mm)
→
1/2 in. (12.7 mm)
RXYQ96T type
7/8 in. (22.2 mm)
→
1 in. (25.4 mm)
(a)
RXYQ120T type
Increase is NOT allowed 1/2 in. (12.7 mm)
→
5/8 in. (15.9 mm)
RXYQ144T type
1-1/8 in. (28.6 mm)
→
1-1/4 in. (31.8 mm)
(a)
RXYQ168-216T type
5/8 in. (15.9 mm)
→
3/4 in. (19.1 mm)
RXYQ240T type
Increase is NOT allowed
RXYQ264-336T type
1-3/8 in. (34.9 mm)
→
1-1/2 in. (38.1 mm)
(a)
3/4 in. (19.1 mm)
→
7/8 in. (22.2 mm)
RXYQ360-408T type Increase is NOT allowed
(a) If size is NOT available, increase is NOT allowed.
7 .4 . Selection of refrigerant branch kits
Refrigerant refnets
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 unit,
choose from the following table in accordance with the capacity of
the outdoor unit (example: refnet joint a - see 7.3. Selection of piping
size).
Outdoor unit capacity type
Kit name
RXYQ 72, 96T type
KHRP26M33T
RXYQ 120-216T type
KHRP26M72TU9
RXYQ 240-408T type
KHRP26M73TU9
• 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 index of all indoor units connected after
the refrigerant branch.
Indoor unit capacity index
Kit name
< 72
KHRP26M22T
72 ≤
×
< 111
KHRP26M33T
111 ≤
×
< 246
KHRP26M72TU9
≥246
KHRP26M73TU9
•
Concerning refnet headers, choose from the following table in
accordance with the total capacity of all the indoor units connected
below the refnet header.
Indoor unit capacity index
Kit name
< 72
KHRP26M22H9:
maximum 4 indoor units
or
KHRP26M33H9:
maximum 8 indoor units
72 ≤
×
< 111
KHRP26M33H9
111 ≤
×
< 230
KHRP26M72H9
≥230
KHRP26M73H9
