E-
16
Installing the Refrigerant Pipe Work
Manifold gauge
Use manifold gauge only for R410A to prevent the inflow of foreign substances.
Vacuum pump
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)
Flare nut
Use only flare nut supplied with the product.
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.
Allowable Length of the Refrigerant Pipe and the Installation Examples
Item
Example
Remarks
Maximum
allowable
length of pipe
Outdoor unit ~
Indoor units
Longest
piping length
Less than
30m
a+b+c+g ≤ 30m
Equivalent
length
Less than
40m
Y-joint and EEV kit : 0.5m
Total length
Less than
75m
a+b+c+d+e+f+g ≤ 75 m
5m ≤ Total length
≤ 75m
Maximum
allowable
height
Outdoor unit ~
Indoor units
Less than 15m
H1
If outdoor unit is
located lower
position H1 ≤15m
Indoor unit ~
Indoor unit
Height
difference
between
indoor units
Less than
7.5m
H2
Maximum
allowable
length of pipe
First Y-joint ~
Last indoor unit
Actual piping
length
Less than
20m
b+c+g ≤ 20 m (between first Y-joint and indoor unit)
h ≤ 20 m (between EEV kit and indoor unit)
Additional refrigerant
calculation
R=Basic 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
Outdoor unit
Indoor unit
Y-Joint
EEV kit
Hydro unit
RD060/070/080PHXEA
RD060PHXEA_IM_E_32352A(2).indd 16
2010-07-26 ｿﾀﾈﾄ 2:19:55
