Maximum refrigerant piping length (Header branch installation)
(m)
Item
4HP
5HP
6HP
8HP
10HP
Maximum piping length
between the RASC unit and the
farthest indoor unit
Actual piping length (L)
75
100
Equivalent piping length (EL)
95
125
Maximum total piping length
2 indoor units (A + B + C)
85
100
115
3 indoor units (A + B + C + D)
95
100
130
4 indoor
units
Case a) (A + B + C + D + E + F + G)
95
100
145
Case b) (A + B + C + D + E)
-
100
145
Maximum piping length
between multikit and indoor
unit
2 indoor units (B, C)
10
15
3 indoor units (B, C, D)
10
15
4 indoor
units
Case a) B + D, B + E, C + F, C + G
10
15
Case b) B, C, D, E
-
15
Maximum height difference
between RASC unit and indoor
unit (H)
RASC unit higher than indoor unit
30
Indoor unit higher than RASC unit
20
Maximum height difference between indoor units
10
Maximum height difference between multikits and between multikit and indoor
unit
3
?
N O T E
•
It is recommended that the refrigerant piping length from the RASC unit to the first branch (A) is greater than the piping length from
the first branch to the farthest indoor unit.
•
All branch piping should be balanced, and the difference between these sections cannot be greater than indicated in the tables below:
(m)
(4/10)HP
2 indoor units
(B-C)
8
3 indoor units
(B-C, B-D, C-D)
4 indoor
units
Case a)
(B+(D or E)) - (C+(F or G))
(D-E)
(F-G)
Case b) Only for (8/10)HP
(B-C, B-D, B-E, C-D, C-E, D-E)
3 Piping work and refrigerant charge
Refrigerant piping range
SMGB0091 rev.2 - 11/2015
39
3