Carrier XCT 7 40VA003D7FAQEE Manual Del Usuario página 16

Installation procedure
<Table-2>
Pipe size Tightening angle
Ø6.35 60°~90°
Ø9.52 60°~90°
Ø12.7 30°~60°
Ø15.88 30°~60°
Ø19.05 20°~35°
<Note>
• Tightening too much will result in cracking at the flare and refrigerant leakage.
• To weld the refrigerant pipe, perform nitrogen replacement (*1), or send nitrogen (*2) into the refrigerant pipe
while welding the pipe. Finally use the flare or flange to connect the indoor unit and connection kit.
(*1) The nitrogen replacement method is provided in the multi-split system work manual.
(*2) If nitrogen flow and welding occur simultaneously, use the pressure-reducing valve.
Approximately 0.02 MPa (0.2 Kg/cm with a slight feeling of breeze) pressure is appropriate.
<Note>
• For pipe welding, do not use an antioxidant because its residue may cause tube blockage and component failure.
• For pipe welding, do not use flux. If the flux is a chlorine product, it will corrode the tube; if it contains fluorine, it will
have a detrimental effect on the refrigerant system, such as refrigerant oil deterioration. Do not use phosphor copper
as the welding material (BCup-2).
Selection of piping dimensions
Select refrigerant branching dimensions between the outdoor units and connection kit and between the 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
40VA003D7FAQEE
40VA005D7FAQEE
40VA010D7FAQEE
40VA020D7FAQEE
40VA026D7FAQEE
Recommended tool length
(mm)
150
200
250
300
450
Weld
Nitrogen
Refrigerant pipe
Dimension(outer diameter)
Liquid pipe / convertible dimension
Ø9.52/Ø6.35
Ø12.7/Ø15.88
Nitrogen cylinder
Binding
15
Apply refrigerant oil