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GMV DC Inverter VRF
4.4 Installation of the Connection Pipe
4.4.1 Precautions when installing the connection pipe
Before welding the pipeline sealing cap, please make sure there's no refrigerant in
pipeline. If welding it directly, it may cause unnecessary property damage or personal injury.
(1) Before welding pipes and sealing caps, please release the residual pressure in the pipes.
Direct welding may lead to property loss or personal injury.
(2) 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.
(3) 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.
(4) When laying the pipes, be careful not to deform them. The radius of bending parts should be
more than 200mm(7-7/8inch). The pipes cannot 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.
(5) Please use a torque spanner to connect union nut on the indoor unit. See Fig.4.4.1.
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 forcibly stretch the pipe joint, otherwise indoor capillary or other pipes might be
damaged and lead to refrigerant leakage.
Fig.4.4.1
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