Refrigerant Circuit; Refrigerant Piping - Hitachi YUTAKI S80 R410A Series Installation And Operation Manual

5.2

Refrigerant circuit

5.2.1 Refrigerant piping
Refrigerant piping length between indoor unit and outdoor unit
◆
The refrigerant piping length between indoor unit and outdoor unit should be designed using the
following chart.
Keep the design point within the area of the chart, which is showing the applicable height
difference according to piping length.
Height difference (m)
When outdoor unit is
installed higher than
indoor unit
When outdoor unit is
installed lower than
indoor unit
Actual piping length (L)
Equivalent piping length
Actual piping length (L)
Outdoor unit higher than indoor unit
Indoor unit higher than outdoor unit

NOTE
(*): If the actual piping length between outdoor and indoor unit needs to be less than 5m, contact
with your dealer.
PMEN0648 rev.0 - 03/2023
Total length between outdoor unit
and indoor unit.
Outdoor Unit (HP)
+H
4 5
75 m 75 m
95 m 95 m
5 m 5 m
30 m 30 m
20 m 20 m
5
6
75 m
95 m
5 m
30 m
20 m
24