GREE GMV5E DC INVERTER VRF UNITS SERVICE MANUAL
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4.3 Vibration Reduction for ODU
The ODU must be fixed securely. Apply a thick rubber sheet or corrugated damping rubber pad with
thickness of 20 mm or more and width of 100 mm or more between the ODU and the foundation, as
shown in the following figures.
4.4 Precautions when installing the connection pipe
(1) 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.
(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. 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.
(5) Please use a torque wrench to connect union nut on the indoor unit. as shown below:
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.
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