YMGI
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Your Modern Green Idea
34
Installation of the Connection Pipe
Precautions when installing the connection pipe
1.
Conform to the following principles during piping connection: Connection pipeline should be as short as
possible. The height difference between indoor and outdoor units should be as short as possible. Keep number
of bends as little as possible. The radius of curvature should be as large as possible.
2.
Weld the connection pipes between indoor and outdoor unit. Please strictly conform to the requirements for
welding process. Rosin joints and pin holes are not allowable.
3.
When laying the pipes, be careful not to deform them. The radius of bending parts should be more than 200mm
(7-7/8in.). The pipes cannot be repeatedly bent or stretched, otherwise the material will harden. Do not bend or
stretch the pipe over three times at the same position.
4.
Please use a torque wrench to connect union nut on the indoor unit. See Fig. 30.
Fig. 30
1. Align the expansion end of copper pipe with the center of threaded joint. Tighten the flare nuts with your hands.
2. Tighten the flare nuts with torque wrench until you hear a "click" sound.
3. Use sponge to wrap the connecting pipe and joints without thermal insulation and tie it up with plastic tape.
4. A mounting support for the connection pipe is required.
5. The curvature degree of the connection pipe should not be small, otherwise the pipe might crack. Installation
personnel should use tube bender when bending the pipe.
6. DO NOT forcibly stretch the pipe joint, otherwise indoor capillary or other pipes might be damaged and lead to
refrigerant leakage.
Y-type manifold
1. Y-type manifold
Fig. 31
2. Y-type manifold has several pipe sections with different pipe size, which facilitates to match with various copper
pipe. Use pipe cutter to cut in the middle of the pipe section with different pipe size and deburr as well. See
Fig.32.
