Carrier service manual
R410a DC Inverter 60Hz
Installation
125
Pipe
Diameter
Torque
Legend
(kgf-cm)
(N-cm)
1/4" (6. 4)
144~176
1420~1720
3/8" (9. 53)
333~407
3270~3990
1/2" (12. 7)
504~616
4950~6030
5/8" (15. 9)
630~770
6180~7540
3/4" (19. 1)
990~1210
9270~11860
Caution: When you are tightening the flaring nut with a spanner, the tightening torque will be suddenly
increased at a certain point. From this point, further tighten the flaring nut to the angles shown below.
Pipe Diameter
Angle of further tightening
Recommended length of tool lever
3/8" (9. 53)
60°~90°
About 7-7/8in.(200mm)
1/2" (12. 7)
30°~60°
About 9-27/32in.(250mm)
5/8" (15. 9)
30°~60°
About 11-13/16in.(300mm)
7) Check whether the surface of the flaring opening is damaged. The size of the flaring opening is as
shown below.
Pipe Diameter
R410A
Legend
Size of Flaring Opening
(A)
9
0°
45
°
A
1/4" (6. 4)
8. 7~9. 1
3/8" (9. 53)
12. 8~13. 2
1/2" (12. 7)
16. 2~16. 6
5/8" (15. 9)
19. 3~19. 7
3/4" (19. 1)
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. 4-ф12. 7).
2) Mechanical bending: Suitable in a wide range of copper pipes (ф6. 4-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
Spanner
Tubing tie-in
Torque spanner
Flaring opening nut