Hitachi YUTAKI S Series Installation And Operation Manual page 27

PIPING AND
REFRIGERANT CHARGE
10.2. REFRIGERANT PIPING LENGTH
The refrigerant piping between the indoor unit and the outdoor unit should be designed using the following chart.
Keep the design point within the dark area of the chart, which is showing the applicable height difference according to piping length.
In case that a piping length is shorter than 5 meters, contact the Hitachi dealer.
■
Piping Length specification:
Height
difference
(m)
When the
Outdoor unit is
installed heigher
than Indoor Unit
When the
Outdoor unit is
installed lower
than Indoor Unit
■
The possible combination between Outdoor Unit and Indoor Unit are the following:
10.2.1. REFRIGERANT PIPING SELECTION
■ Piping connection size of Outdoor Unit, Indoor Unit.
Pipe Connection size between units
RAS-8.0/10.0HRNME-AF
Total length between
L(m)
Outdoor Unit and each
Indoor Unit
30
Single System
Distance must be bigger than Σ B+C+D
Outdoor Unit
Liquid Pipe
9.53 (3/8")
RAS-8.0HRNME-AF
[12.7 (1/2")]
RAS-10.0HRNME-AF 12.7 (1/2")
(1*) Select the piping size of the Ø12.7 (1/2") when the length is more than 70m
(Only RAS-8)
(2*) The accessory pipe is attached
Gas piping Size
Indoor Unit
(B, C, D or E)
RAS-8.0HRNME 22,2 (7/8")
Ø
RAS-10.0HRNME 9.05 (3/4")
Ø
(*) Dimensions after reducction pipe.
Mark Maximum Piping Length
Actual piping length ≤ 30m
L
Equivalent piping length ≤ 40m
Outdoor unit higher than indoor unit ≤ 30m
H
Indoor unit higher than outdoor unit ≤ 20m
Pipe Size
Gas Pipe
(2*)
25.4 (1")
(1*)
25.4 (1")
Liquid piping Size
(B, C, D or E)
9.53 (3/8")
Ø
9.53 (3/8")
Ø
PMML0215A rev.1 - 02/2012
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