Samsung DVM S AM MXVAFC Series Installation Manual page 47

Keeping refrigerant pipe
To prevent foreign materials or water from entering the pipe, storing method and sealing method (especially during
installation)is very important. Apply correct sealing method depending on the environment.
Exposure place
Outdoor
Indoor
Refrigerant pipe welding and safety information
Important information for refrigerant pipe work
Make sure there is no moisture inside the pipe.
CAUTION
Make sure there are no foreign substances and impurities in the pipe.
Make sure there is no leakage.
Make sure to follow the instruction when welding or storing the pipe.
Nitrogen flushing welding
When welding the refrigerant pipes, flush them with nitrogen gas as shown in the picture.
If you do not perform nitrogen flushing when welding the pipes, oxide may form inside the pipe. It can cause the
damage of the important parts such as compressor and valves etc.
Adjust the flow rate of the nitrogen flushing with a pressure regulator to maintain 0.05m
Welding part
Nitrogen gas
Pressure regulator
Direction of the pipe when welding
Direction of the pipe should be headed downward or in a sideways when welding.
Avoid welding the pipe with pipe direction heading upward.
When you test gas leakage after welding the pipes, use a designated solution for gas leakage detection. If you
use the detection solution that includes sulfuric ingredient, it may cause corrosion to the pipes.
CAUTION
Exposure time
Longer than one month
Shorter than one month
Ø 6.35 (1/4") copper pipe
Stop valve
Taping
Flowmeter
High pressure hose
-
Sealing type
Pipe pinch
Taping
Taping
2 /h(0.54ft 2 /h) or less.
47