Installation Of Refrigerant Pipe; Three Principles Of Installing The Refrigerant Pipe; Flared Coupling Of The Refrigerant Pipe - Trane MWD507 Installation & Operation Manual

Installation of refrigerant pipe

Three principles of installing the refrigerant pipe

Drying
Cleaning
Tightness

Flared coupling of the refrigerant pipe

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Cause
Rainwater, water for engineering invaded
from outside
Invasion of condensate water in the pipe
Oxide formed in the pipe during welding
Dust, impurities invaded from outside
Incomplete welding
Air leakage from horn tube
Air leakage from side
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
Spanner
Torque wrench
Piping joint
Flare nut
Measures against failure
Processing Purging
Replace nitrogen gas
Purging
Use appropriate material
Strictly comply with basic operation of the horn tube
Strictly comply with basic operation of welding
Strictly comply with basic operation of pipe connection
Size
Tightening torque
(mm)
14.2~17.2 N•m
Ø6.35
(144~176 Kgf•cm)
32.7~39.9 N•m
Ø9.52
(333~407 Kgf•cm)
49.5~60.3 N•m
Ø12.70
(504~616 Kgf•cm)
61.8~75.4 N•m
Ø15.88
(630~770 Kgf•cm)
92.7~118.6 N•m
Ø19.05
(990~1210 Kgf•cm)
Vacuum drying
(copper tube, welding rod)
Size of flared pipe A
(mm)
8.7~9.1
12.8~13.2
16.2~16.6
19.3~19.7
23.1~23.7
AMS-SVX04A-EN