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Since this type of components may cause significant pressure drops, their use must be carefully eveluated.
• Supports shall be installed to support the pipes weight and shall be spaced according to the following prescriptions:
• Curves and joints cause pressure drops. Large-radius curves are strongly recommended; in case of barriers to
overcome 45° curves are recommended if compared to 90°.
• T joint shall be made in accordance with the following prescriptions:
• The vibration and noise reduction is very important, and can be carried out by appropriate devices such as: resilient
joints (strongly recommended for diameters higher than 50 mm), proper insulation to separate the pipe from the wall (if
the pipe passes through the wall), flexible anchors.
• Pipe placing:
The installation of too many curves is not recommended, because each curve cause an increase rectilinear section.
Moreover, the curves must be shaped with a large curvature radius. Be extremely careful to not reduce the pipe section
because it could obstruct the normal flow of refrigerant, with consequent overwork for the compressor. The presence of
too many curves in the plant could create friction and vibration, causing at the connection points pipes and vents
slackening or breakage.
• Difference in height:
The difference in height recommended by the manufacturer shall be respected between the evaporating unit and the
condensing units, otherwise cooling capacity, oil return and lubrication problems may occur.
• Flare connections
A good flare connection shall not be characterized by flash, especially in the conical contact section of the tap or of the
connection and shall be able to work without friction.
The ideal space between folder and pipe union shall be approximately 5 mm; during tightening it is recommended to
apply a drop of oil to ease locking. Be careful not to apply the oil in the contact or sealing area with the pipe union, as the
oil coating will tend to dry out.
Maximum allowed distance between indoor and outdoor units
Oil traps shall be installed at the base of each vertical section with upward flow direction; a very long vertical pipe shall
be equipped with an oil trap every 3-4 m distance.
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