Hitachi RAS-3-HVNC - Caution in Case of Refrigerant Leakage

3. Piping work and refrigerant charge
64
SMGB0079 rev.0 - 01/2013
IVX Standard series
(m)
Outdoor Unit
3HP 4HP 5HP 6HP 8HP 10HP 12HP
Maximum piping length
between the outdoor unit
and the farthest indoor
unit
Actual Length (L)
50 70 75 100
Equivalent Length (EL)
70 90 95 125
Total piping length
2 units (A+B+C)
60 80 85 100 115
3 units (A+B+C+D)
-- 90 95 100 130
4 units
(A+B+C+D+E+F+G+)
-- 90 95 100 145
Maximum piping line
after rst branch
2 and 3 units (B, C, D)
10 15
4 units
(B+D, B+E, C+F, C+G)
-- 10 15
Main piping length A
A > B, C, D, E, F, G
Maximum height difference
Outdoor / Indoor (H)
(Outdoor Unit is Higher / Lower.)
30 / 20
Maximum height difference Indoor / Indoor
3
Maximum height difference:
branch pipe/Indoor (2,3 and 4 indoor units system)
branch pipe/branch pipe (4 indoor units system)
3
(B-C) / (B-D) / (C-D) / (C+G)-(B+E) / (C+G)-(B+D) /
(C+F)-(B+E) / (C+F)-(B+D)
< 8
N O T E
• Theliquidpipingandthegaspipingmustbeofthesamepipinglengthandrunalongthesameroute.
• Installthebranchpipingasmuchaspossibleneartheindoorunits
• InstallMultikitsatthesamehorizontallevel.