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REFRIGERANT PIPING &
REFRIGERANT CHARGE
11.4. 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.
11.4.1. 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
11.4.2. REFRIGERANT PIPING SELECTION
Select the piping connection sizes according to the following
•
procedures:
- Between Outdoor Unit and branch pipe:
- Select the same pipe connection size as the pipe size of the
Outdoor Unit
- Between branch pipe and Indoor Unit:
- Select the same pipe connection size as the pipe size of the
Indoor Unit
PMML138A_R1-eng-fre.indb 28
Total length between
Outdoor Unit and
each Indoor Unit
L(m
30
30m
Maximum Piping Length
Actual piping length ≤ 30m
Equivalent piping length ≤ 40m
Piping connection size of Outdoor Unit & Indoor Unit
•
Pipe Size
Outdoor
Gas Pipe
Liquid Pipe
Unit
(A)
3.0 HP
15.88 (5/8)
9.53 (3/8)
4.0 HP
15.88 (5/8)
9.53 (3/8)
5.0 HP
15.88 (5/8)
9.53 (3/8)
PMML0138A-rev.1 - 11/2009
200
200
(A)
28
19/11/2009 14:45:22
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