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7.4 PRECAUTIONS FOR REFRIGERANT LINE SIZING
• Suction line must always be insulated to avoid condensate formation.
• The liquid line must be insulated if the outdoor temperature is higher than the liquid temperature. (approximately 5°C less than the
condensing temperature)
• The discharge line must be insulated only to prevent from burning danger (the temperature can reach up to 100°C)
• Special couplings or U-shaped or L-shaped sections can be used to compensate the copper pipe expansions. The expansion of the
pipe can be estimated using the following table:
Temperature (°C)
Expansion (mm/mt)
These special couplings or U-shaped or L-shaped sections used to compensate the pipe expansion can be sized according to the
following sketch:
Since this type of components may cause significant pressure drops, their use must be carefully evaluated.
• Supports shall be installed to support the pipes weight and shall be spaced according to the following prescriptions:
Pipe diameter (mm)
Max distance between the supports (m)
• 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:
-20
0
0
0.4
14-18
2
25
50
0.7
1.1
22-28
2.5
Page 18
75
100
1.5
1.9
35-54
63
3
3.5
125
2.3
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