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45
English
INSTALLATION PARTS
Storing refrigerant pipe
To prevent foreign materials or water from entering the pipe, it is important to keep the refrigerant pipe
sealed in clean and dry condition during installation. Apply correct sealing method depending on the
environment.
Stored place Stored time Sealing type
Outside
Longer than one month
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Shorter than one month
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Inside -
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Refrigerant pipe brazing and safety information
• Important information for refrigerant pipe work
ࣕ Make sure that there is no moisture inside the pipe.
ࣕ Make sure that there are no foreign materials and impurities in the pipe.
ࣕ Make sure that there is no leak.
ࣕ Make sure to follow the instruction when brazing and keeping the pipe.
• Nitrogen flushing brazing
ࣕ Use nitrogen gas when brazing the pipes as shown in the picture.
ࣕ If you do not perform nitrogen flushing when brazing the pipes, oxide may form inside the pipe. It
can cause the damage of the important parts such as compressor, valves.
ࣕ Adjust the flow rate of the nitrogen flushing with a pressure regulator to maintain 0.05m
3
/h or less.
ࣕ Wrap the bottom side of the service valve with a wet cloth and weld it as shown in the figure. Since
water will evaporate during welding, pour some water time to time. If not, O-ring and packing inside
the service valve may get damaged by a welding fire and cause critical leakage.
Brazing part
ø 6.35 (1/4”) copper pipe
Stop valve
Taping
High pressure hose
Flowmeter
Pressure regulator
Nitrogen gas
Nitrogen gas
Wet towel
Gas side
service valve
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