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PMML0140A rev.1 - 07/2009
REFRIGERANT PIPING &
REFRIGERANT CHARGE
Example in a Single and Twin systems:•
Single system Twin system
Maximum piping length according to the unit:•
Mark Unit
Maximum Piping Length
Actual piping length Equivalent piping length
L
RASC-3H(V)RNE
≤ 30 m ≤ 45 m
RASC-5/10HVRNE
≤ 50 m ≤ 70 m
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.
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
Unit
Gas piping
size
Liquid
piping size
Distributor
Twin Quad
RASC-3 15.88 (5/8”) 9.53 (3/8”) TE-03N -
RASC-5 15.88 (5/8”) 9.53 (3/8”) TE-56N -
RASC-10 25.4 (1”) 12.7 (1/2”) TE-10N QE-810N
For RASC-10HRNE units, use a reducer pipe in the following •
installations:
Installation
type
Distributor
Pipe
Type
Dimensions
a b
Single -
Gas Ø 25.4 Ø 22.2
Liquid Ø 12.7 Ø 9.53
Twin TE-56N Liquid Ø 9.53 Ø 6.35
Quad QE-810N Liquid Ø 12.7 Ø 9.53
NOTE:
For Twin system: -
L=C+(the longest
distance from
indoor unit to
branch pipe).
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