Hitachi RAS-4-HNPE - Piping Compatibility with R22 or R407 C Installations

3. Piping work and refrigerant charge
65
SMGB0079 rev.0 - 01/2013
3
3.3.3 Piping system for line branch
OU 3 HP 4 HP 5 HP 6 HP 8 HP 10 HP 12 HP
IU
quantity
allowed
IVX Premium
2 -3 2 - 5 2 - 6 2 - 8
IVX Standard
-- 2 - 4
(picture is as example)

Maximum refrigerant piping length (Line branch system)
IVX Premium 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 (L1)
50 75 100
Equivalent Length (EL)
70 95 125
Maximum piping length from rst branch to each indoor unit (L2)
20 30 40
Maximum piping length from branch to indoor unit (L3)
10 15
Total piping length L4 + (L3
1
+L3
2
+L3
3
....)
60 95 100 145
Maximum height difference
Outdoor / Indoor (H)
(Outdoor Unit is Higher / Lower.)
30 / 20
Maximum height Difference Indoor / Indoor
10
Maximum height difference:
Branch pipe/Indoor
Branch pipe/branch pipe
3
IVX Standard series
(m)
Outdoor Unit
4HP 5HP 6HP 8HP 10HP 12HP
Maximum piping length between the
outdoor unit and the farthest indoor unit
Actual Length (L1)
70 75 100
Equivalent Length (EL)
90 95 125
Maximum piping length from rst branch to each indoor unit (L2)
20 25
Maximum piping length from branch to indoor unit (L3)
10 15
Total piping length L4 + (L3
1
+L3
2
+L3
3
....)
70 75 100 145
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
Branch pipe/branch pipe
3