MCAC-VTSM-2011-09
Installation
Refrigerant Piping Installation
91
3/8" (9. 52)
12. 8~13. 2
90°
45
°
A
1/2" (12. 7)
16. 2~16. 6
5/8" (15. 88)
19. 3~19. 7
3/4" (19. 05)
23. 6~24. 0
Cautions:
a. Apply some refrigeration oil onto the inner surface and outer surface of the flaring opening, to facilitate the
connection or rotation of the flaring nut, ensure close sticking between the sealing surface and the bearing
surface, and avoid pipe bending.
b. Ensure that the flaring opening is not cracked or deformed, otherwise it cannot be sealed or, after the
system runs for some time, refrigerant leakage will occur.
3.1.3.5. Pipe bending
1. Method
1) Manual bending: Suitable for thin copper pipes (ф6. 35-ф12. 7).
2) Mechanical bending: Suitable in a wide
range of copper pipes (ф6. 35-ф67). Spring bender, manual
bender or electric bender is used.
Purpose: Reduce welding joints and required elbows, and improve engineering quality; In order to save
material, no joint is needed.
2. Caution
1) When bending a copper pipe, ensure that there is no twinkle or deformation on the inner side of the pipe.
2) When using a spring bender, ensure that the bender is clean before inserting it in the copper pipe.
3) When using a spring bender, ensure that the bending angle does not exceed 90°, otherwise twinkle will
appear on the inner side of the pipe, and the pipe may easily get broken.
4) Ensure that the pipe does not sink during the bending process; ensure that the cross section of the bending
pipe is larger than 2/3 of the original area, otherwise it cannot be used.
the pipe sink easily on the side
twinkle will easily appear on this side
3.1.4 Brazing welding operation
3.1.4.1. Selecting refrigerant pipe
1. All pipe use shall comply with national or local standards (for example, pipe diameter, material,
thickness, etc.)
2. Specification: Seamless phosphorus to oxygenate copper pipe
3. Try best to use straight pipe or coil and avoid too much brazing welding.
Note: Select the pipes according to the pipe diameters shown below (O
—coil, 1/2H—straight pipe)
