Installing the Refrigerant Pipe Work
Install the refrigerant pipe within the maximum allowable length, difference in height and length of
after the first branch pipe.
The pressure of the R410A is high.
Use only rated refrigerant pipe and follow the installation method.
Use clean refrigerant pipe Where there is no harmful ion, oxide, dust, iron content or moisture.
Use adequate tools and accessories for R410A.
Manifold gauge
Vacuum pump
Flare nut
Allowable Length of the Refrigerant Pipe and the Installation Examples
RD060/070/080PHXEA
Outdoor unit
Maximum
Outdoor unit ~
allowable
Indoor units
length of pipe
Outdoor unit ~
Indoor units
Maximum
allowable
Indoor unit ~
height
Indoor unit
Maximum
First Y-joint ~
allowable
Last indoor unit
length of pipe
Additional refrigerant
calculation
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E-
RD060PHXEA_IM_E_32352A(2).indd
Use manifold gauge only for R410A to prevent the inflow of foreign substances.
Use vacuum pump with check valve to prevent pump oil from flowing backward while
the vacuum pump is stopped.
Use the vacuum pump that the vacuum induction is available up to 5Torr
(666.6Pa , 0.0067 kgf/cm², 5 mmHg)
Use only flare nut supplied with the product.
Item
Longest
Less than
piping length
30m
Equivalent
Less than
length
40m
Less than
Total length
75m
Less than 15m
Height
difference
Less than
between
7.5m
indoor units
Actual piping
Less than
length
20m
R=Basic charge + additional charge by the piping length
Basic charge : Up to 5m when installing A2W only = 2200g
When installing A2W and A2A together, add basic additional refrigerant (700g)=2900g
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Example
a+b+c+g ≤ 30m
Y-joint and EEV kit : 0.5m
a+b+c+d+e+f+g ≤ 75 m
H1
H2
b+c+g ≤ 20 m (between first Y-joint and indoor unit)
h ≤ 20 m (between EEV kit and indoor unit)
Indoor unit
Y-Joint
EEV kit
Hydro unit
Remarks
5m ≤ Total length
≤ 75m
If outdoor unit is
located lower
position H1 ≤15m
2010-07-26
ソタネト 2:19:55