ENGLISH-28
Refrigerant piping work
f
Install the refrigerant pipe within the maximum allowable length, difference in height and length of after the first branch pipe.
f
The pressure of the R-32 is high.
Use only rated refrigerant pipe and follow the installation method.
f
Use clean refrigerant pipe Where there is no harmful ion, oxide, dust, iron content or moisture.
f
Use adequate tools and accessories for R-32.
Manifold gauge
• Use manifold gauge only for
R-32
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. (-100.7kPa)
Flare nut
• Use only flare nut supplied with the product.
Allowable length of the refrigerant pipe and the installation examples
Outdoor unit
Item
Example
Remarks
Maximum allowable
length of pipe
Outdoor unit
~ Hydro unit
Total length
Less than
35 m
a ≤ 35 m
Maximum allowable
height
Outdoor unit
~ Hydro unit
Less than 20 m
H1
If outdoor unit
is located lower
position H1 ≤15 m
Additional refrigerant calculation
R=Basic additional charge by the piping length
Contact the manufacturer if the length should exceed.
