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(3) Pipe materials
For the refrigerant pipes, copper pipe and joints are mainly used.
It is necessary to select the most appropriate pipes to conform to the standard.
Use clean pipes or joints to which little impurities adhere.
(1) Copper pipe
Be sure to select the pipes with copper thickness in the table below since the pressure of an Air to Water Heat
Pump using R32 is higher than that of R22.
(2) Joint
The flare joint and socket joint are used for joints of the copper pipe.
The joints are rarely used for installation of the Air to Water Heat Pump.
However clear impurities when using them.
<Piping>
The pipe thickness, flare-finishing size, flare nut and others differ according to a refrigerant type.
When using a long copper pipe for R32, it is recommended to select “Copper or copper-base pipe without seam”
and one with bonded oil amount 40 mg / 10 m or less.
Also do not use crushed, deformed, discolored (especially inside) pipes.
(Impurities cause clogging of expansion valves and capillary tubes.)
<Flare nut>
Use the flare nuts which are attached to the Air to Water Heat Pump unit.
Nominal diameter Outer diameter (mm)
Thickness (mm)
R410A or R32
Make sure not to use a thin copper pipe
such as 0.7 mm copper thickness in the
market.
1/4 6.4 0.80
1/2 12.7 0.80
5/8 15.9 1.00
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