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Selecting the first branch joint (D)
The first Y-joint(D) for liquid and low pressure gas pipes is MXJ-YA2512M regardless of the outdoor unit
capacity.
The first Y-joint(D) for high pressure gas pipes is MXJ-YA1500M regardless of the outdoor unit capacity.
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
CAUTION
to the pipes.
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
/h or less.
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