Installation of refrigerant pipe
Three principles of installing the refrigerant pipe
ā
Cause
Measures against failure
Drying
Rainwater, water for engineering invaded
from outside
Processing
Ś
Purging
Ś
Vacuum drying
Invasion of condensate water in the pipe
Cleaning
Oxide formed in the pipe during welding
Replace nitrogen gas
Dust, impurities invaded from outside
Purging
Tightness
Incomplete welding
Use appropriate material
Ś
(copper tube, welding rod)
Air leakage from horn tube
Strictly comply with basic operation of the horn tube
Air leakage from side
Strictly comply with basic operation of welding
Strictly comply with basic operation of pipe connection
Flared coupling of the refrigerant pipe
Cutting of the pipe should be carried out by using a pipe cutter. If the pipe size is too large, a
•
metal cut saw may be used, but prevent saw dust entering into the pipe;
Only the fl are nut attached to the unit may be used. Before fl aring, fi rst mount the nut on the
•
copper tube;
Check whether there are damages on the fl ared surface. After the mouth of the copper tube is
•
fl ared, keep concentric. Burr, cracks, folding, etc. are not allowed;
When coupling the fl are opening, apply ester oil or ether oil to inner and outer surfaces of the
•
opening, and fi rst screw the nut by 3 ~ 4 turns;
Tighten the fl are nut by a proper torque, but do not damage the nut because of excessive torque.
•
Hold the pipe with two spanners.
R 0.4~0.8
90
°±2
°
45
°±2
°
A
Torque wrench
Spanner
Piping joint
Flare nut
Size
(mm)
Tightening torque
Size of flared pipe A
(mm)
Ø6.35
14.2~17.2 N•m
(144~176 Kgf•cm)
8.7~9.1
Ø9.52
32.7~39.9 N•m
(333~407 Kgf•cm)
12.8~13.2
Ø12.70
49.5~60.3 N•m
(504~616 Kgf•cm)
16.2~16.6
Ø15.88
61.8~75.4 N•m
(630~770 Kgf•cm)
19.3~19.7
Ø19.05
92.7~118.6 N•m
(990~1210 Kgf•cm)
23.1~23.7
14
AMS-SVX04A-EN
