Refrigerant And Water Piping; Refrigerant Circuit; Refrigerant Piping - Hitachi YUTAKI Serie Installations- Und Betriebshandbuch

REFRIGERANT AND WATER PIPING

6 REFRIGERANT AND WATER PIPING

6.1 REFRIGERANT CIRCUIT

6.1.1 Refrigerant piping


Refrigerant piping length between indoor unit and outdoor unit (For YUTAKI (S/S COMBI/S80))
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
Maximum piping length between outdoor
unit and indoor unit (Lmax)
Minimum piping length between outdoor
unit and indoor unit (Lmin)
Maximum height difference between indoor
and outdoor unit (H)
?
N O T E
(*): If the actual piping length between outdoor and indoor unit needs to be less than 5m, contact with your dealer.

Refrigerant piping size
Piping connection size of outdoor unit & indoor unit
Model
2 HP
Ø 12.7 (1/2") (*)
2.5 HP
(3-6) HP Ø 15.88 (5/8")
8 HP
10 HP
?
N O T E
(*): The refrigerant gas piping size for 2/2.5 HP and the refrigerant liquid piping size of 2.5 HP are different between outdoor and indoor unit. Therefore,
refrigerant pipe adapters are required to connect these units. Pipe size must be installed according to the outdoor units. These pipe adapters are factory
supplied with the outdoor unit.
Model
2 HP Ø15.88→Ø12.7
2.5 HP Ø15.88→Ø12.7
85 PMML0335A rev.1 - 04/2016
Total length between outdoor
unit and indoor unit.
Actual piping length (L)
Equivalent piping length (X)
Actual piping length
Outdoor unit higher than indoor unit
Indoor unit higher than outdoor unit
Pipe size
Gas pipe Liquid pipe
Ø 6.35 (1/4")
Ø 6.35 (1/4") (*)
Ø 9.52 (3/8")
Ø 9.52 (3/8")
Ø 25.4 (1")
Ø 12.7 (1/2")
Pipe adapter
Gas pipe Liquid pipe
-
Ø9.52→Ø6.35
+H
2-3 HP
50 m
70 m
Indoor unit
Model
Gas pipe
2.0 HP
Ø 15.88 (5/8") (*)
2.5 HP
(3.0-6.0) HP Ø 15.88 (5/8")
8 HP
Ø 25.4 (1")
10 HP
OU Model
4-6 HP 8/10 HP
75 m 70 m
95 m 90 m
5 m (*)
30 m
20 m
Pipe size
Liquid pipe
Ø 6.35 (1/4")
Ø 9.52 (3/8") (*)
Ø 9.52 (3/8")
Ø 9.52 (3/8")
Ø 12.7 (1/2")