D.C. Inverter Multi VRF Modular
27
(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. The pipes can not be repeatedly bent or stretched, otherwise the
material will get 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. 29.
Fig.31
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 "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 connection pipe should not be small, otherwise the pipe might
crack. Installation personnel should use tube bender when bending the pipe.
6) Don't forbibly stretch the pipe joint, otherwise indoor capillary or other pipes might be
damaged and lead to refrigerant leakage.
4.3.2 Y-type manifold
(1) Y-type manifold
Fig.32
(2) Y-type manifold has serveral 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.31.
(3) Y-type manifold must be installed vertically or horizontally.
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