R410A All DC Inverter V5 X Series 50Hz
MCAC-VTSM-2015-10
102 Installation
7) Check whether the surface of the flaring opening is damaged. The size of the flaring opening is as shown
below.
Pipe Diameter
(mm)
R410A
Legend
Size of Flaring Opening (A)
90°
45
°
A
6. 35
8. 7~9. 1
9. 53
12. 8~13. 2
12. 7
16. 2~16. 6
15. 9
19. 3~19. 7
19. 1
23. 6~24. 0
Cautions:
a. Apply some refrigeration oil onto the inner surface and outer surface of the flared opening, to facilitate the connection or
rotation of the flaring nut, ensure firm connection between the sealing surface and the bearing surface, and avoid pipe bending.
b. Ensure that the flared opening is not cracked or deformed, otherwise it cannot be sealed or, after the system runs for some
time, refrigerant leakage will occur.
4.3.5
Pipe bending
1. Method
1) Manual bending: Suitable for thin copper pipes
Φ6.35mm - Φ12.7mm.
2) Mechanical bending: Suitable in a wide range of copper pipes (
Φ6.35mm-Φ67mm). Spring bender, manual
bender or electric bender is used.
Purpose: Reduce welding joints and required elbows, and improve engineering quality; save material, no joint
is needed.
2. Caution
1) When bending a copper pipe, ensure that there are no wrinkles 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 wrinkles will
appear on the inner side of the pipe, and the pipe may crack.
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.
twinkle will appear
on this side
pipe sink easily
on this side
4.4 Brazing
4.4.1
Selecting refrigerant pipe
1. All pipe used shall comply with national or local standards (for example, pipe diameter, material, thickness,
etc.)
2. Specifications: Seamless phosphorus to oxygenate copper pipe
3. It is best to use straight pipe or coil and avoid excessive brazing.
Note: Select the pipes according to the pipe diameters shown below (O
—coil, 1/2H—straight pipe)
