Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual
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6)
Operation requirements
(1) During soldering, the nitrogen pressure must be controlled within the range of 0.2 kgf/cm² to
0.3 kgf/cm².
(2) Only nitrogen is used. Do not use oxygen or other inflammable or combustible gases. Otherwise,
explosion may occur.
(3) A pressure reducing valve is required. The pressure of filled-in nitrogen must be 0.2 kgf/cm².
(4) Select a proper place for nitrogen filling.
(5) Ensure that the nitrogen flow can pass the soldering point.
(6) If the distance between the place where nitrogen is filled in and the soldering point on the pipe,
fill in enough nitrogen and ensure that all nitrogen flow at the soldering point can be vent.
(7) Keep filling nitrogen after the soldering is completed until the pipe returns to the ambient
temperature.
(8) The soldering should be performed from top to bottom, or horizontally. Avoid face-down
bonding.
7)
Precautions
(1) Watch out for fire during soldering (prepare fire extinguishers as required).
(2) Be careful during soldering and avoid being burned.
(3) Leave proper distances between pipe sockets.
