Hitachi UTOPIA RASC Series Installation And Operation Manual page 31

REFRIGERANT PIPING &
REFRIGERANT CHARGE
Example in a Single and Twin systems:
•
Single system
+H
Maximum piping length according to the unit:
•
Mark Unit
Actual piping length Equivalent piping length
RASC-3H(V)RNE
L
RASC-5/10HVRNE
L = Piping length.

NOTE:
- Install the branch pipe at the location from where the piping
length to the indoor units is of equal distance. However,
when different piping lengths from the branch pipe to the
indoor units, due to building construction are required, the
difference between the two pipes should be less than 8 m.
-H
Maximum Piping Length
≤ 30 m ≤ 45 m
≤ 50 m ≤ 70 m
Twin system
+H
11.4.2. REFRIGERANT PIPING SELECTION
Select the piping connection sizes according to the following
•
procedures:
- Between RASC unit and branch pipe:
Select the same pipe connection size as the pipe size of
the RASC Unit
- Between branch pipe and Indoor Unit:
Select the same pipe connection size as the pipe size of
the Indoor Unit
Gas piping
Unit
size piping size
RASC-3 15.88 (5/8") 9.53 (3/8")
RASC-5 15.88 (5/8") 9.53 (3/8")
RASC-10 25.4 (1") 12.7 (1/2")
For RASC-10HRNE units, use a reducer pipe in the following
•
installations:
Installation
Distributor
type
Single -
Twin TE-56N
Quad QE-810N
PMML0140A rev.1 - 07/2009

NOTE:
-H
-
For Twin system:
L=C+(the longest
distance from
indoor unit to
branch pipe).
Distributor
Liquid
Twin
TE-03N
TE-56N
TE-10N QE-810N
Pipe
Dimensions
Type
a
Gas Ø 25.4
Liquid Ø 12.7
Liquid Ø 9.53
Liquid Ø 12.7
Quad
-
-
b
Ø 22.2
Ø 9.53
Ø 6.35
Ø 9.53
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