Hitachi RAS-8FSXNS2E Installation & Operation Manual page 27

Total Piping Length between CH-Box and Each Indoor Unit
Piping Length between Piping Connection Kit 1 and Each Outdoor Unit
Height Difference between
Outdoor Units and Indoor Units
Height Difference between Indoor Units
Height Difference between Indoor Units using the Same Branch of CH-Box
Height Difference between CH-Boxes
Height Difference between Outdoor Units
Height Difference between CH-Box and Indoor Units
: The maximum piping length of 110m is available on request. The following restrictions apply
*1
when the height difference between the outdoor units and the indoor units (the outdoor unit is
higher) are 50m or more.
• The maximum outdoor temperature during cooling operation is 43°C.
• The height difference between the outdoor units and the indoor units must be 50m or less when
the outdoor units are operated at an outside temperature of -10°C or less.
• The connectable indoor unit capacity ratio is ≤ 100%.
• To protect the system, the thermo OFF may be activated to turn the system off when the outside
temperature is 38°C or more.
• Performance priority mode is disabled.
: The maximum piping length of 110m is available on request. The following restrictions apply
*2
when the height difference between the outdoor units and the indoor units (the outdoor unit is
lower) are 40m or more.
• The maximum outdoor temperature during cooling operation is 43°C.
• The minimum outdoor temperature during cooling operation is 10°C.
• The connectable indoor unit capacity ratio is ≤ 130%.
: The piping length calculation is not included the Multi-Kit between CH-Box and Indoor Unit(s).
*3
(Lm in following examples are NOT L3.)
: If the height difference between indoor units or the height difference between CH-Boxes exceed
*4
15m, the liquid lines after the Multi-kit of first branch should be selected according to Height
Difference between Indoor Units Restriction.
PMML0628 rev.0 - 05/2023
Item
O.U. is Higher
O.U. is Lower
Allowables Piping
Mark
Length (m)
e+f+g+h+i ≤40
La, Lb, Lc, Ld ≤25
≤50
H1
≤40
H2 ≤40
H3 ≤4
H4 ≤40
H5 ≤2.0
H6 ≤15
*1
*2
*4
3
20