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On the discharge line, there is the same problem due to the oil flow on the suction line. The solution to the problem is
the same. In this case, the most important issue could be the oil drop towards the compressor. This issue can be
solved using check valves and making oil taps if the condenser is mounted at a higher level than the compressor.
On the liquid line, it is important to avoid that non liquid refrigerant reaches the thermostatic valve. This purpose is
achieved by giving to the fluid a high subcooling in the condenser, but a proper sized liquid receiver shall be installed
upstream from the line in the case of high lengths (over 20 meters). If the liquid temperature is lower than the outdoor
temperature (it may happen for water cooled units) the line shall be properly insulated.
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:
These special couplings or U-shaped or L-shaped sections used to compensate the pipe expansion can be sized
according to the following sketch:
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