Refrigerant Piping Length - Hitachi RAS-5HVRNM1E Service Manual

3 Piping work and
refrigerant charge

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 specification:
Unit
RAS-3HVRNME
RAS-4H(V)RNM1E
RAS-5H(V)RNM1E
RAS-6H(V)RNM1E
The possible combination between Outdoor Unit and Indoor Unit are the following:
Single System
—
65
SMGB0060 rev. 1- 12/2010
Maximum piping length between Outdoor and each
indoor unit (L)
Actual/Equivalent
50/70
70/90
75/95
Twin System
L = A + Longest of B & C
Maximum Height difference.
Outdoor unit is higher than indoor unit
Indoor unit is higher than Outdoor unit (H)
30/20
Triple System
L = A+ Longest of B, C & D
3