Hitachi RAS-(4-12)HRNM(2)(E) - Refrigerant Piping Length; Piping Length Specification; The Possible Combination between Outdoor Unit and Indoor Unit

3 Piping work and
refrigerant charge
65
SMGB0064 rev.0 - 08/2011
3
3.3.2 Refrigerant piping length
The refrigerant piping between the indoor unit and the outdoor unit should be designed using the following table.
• Piping length specication:
Unit
Maximum piping length between Outdoor and each
indoor unit (L)
Actual/Equivalent
Maximum Height difference.
Outdoor unit is higher than indoor unit
Indoor unit is higher than Outdoor unit (H)
RAS-3HVRNM2E 50/70
30/20
RAS-4H(V)RNM2E 70/90
RAS-5H(V)RNM2E
75/95
RAS-6H(V)RNM2E
The possible combination between Outdoor Unit and Indoor Unit are the following:
Single System Twin System Triple System
— L = A + Longest of B & C L = A+ Longest of B, C & D