20
Selection of piping dimensions
Select refrigerant branching dimensions between outdoor units and connection kit, between connection kit and
indoor units according to the Operation & Installation Manual of outdoor units and indoor units.
Dimensions (mm) of connection pipe of the vale box
model
Dimension
（
outer diameter
）
Gas pipe/ convertible dimension Liquid pipe/ convertible dimension
AH1-280A Ø25.4/Ø22.22/Ø19.05 Ø9.52/Ø12.7
AH1-560A Ø28.58/Ø25.4/Ø22.22 Ø9.52/Ø12.7
Nitrogen cylinder
Refrigerant pipe
Nitrogen
Nitrogen
Weld
Binding
<Note>
• For pipe welding, do not use antioxidant, for its residue may cause tube blocking and component fault.
• For pipe welding, do not use ux. If the ux is chlorine product, it will corrode the tube; if it contains uorine, it will
even cause detrimental effects to the refrigerant system, such as refrigerant oil deterioration. Please do not use
phosphor copper for welding material (BCup-2).
<Note>
• Excessive tightening will result in cracking at the are and refrigerant leakage.
• To weld the refrigerant pipe, please make nitrogen replacement (*1), or send nitrogen (*2) into the refrigerant pipe
while welding the pipe (refer to Fig.3). Finally use the are or ange to connect the indoor unit and connection
kit.
(*1) Nitrogen replacement method is provided in the multi-split system work manual.
(*2) If nitrogen owing and welding proceed simultaneously, do use pressure reducing valve. Approximately 0.02
MPa (0.2 Kg/cm with a slight feeling of breeze) pressure is quite proper.
<Table-2>
Pipe size Tightening angle
Recommended tool length
(mm)
Ø6.35 60°~90° 150
Ø9.52 60°~90° 200
Ø12.7 30°~60° 250
Ø15.88 30°~60° 300
Ø19.05 20°~35° 450
Apply refrigerant oil
To Next Page
Loading...
