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Technical information Chillers How to correct: Condensing pressure too low

How to fix: too low Condensing pressure

  • The only way to solve this problem is to install a pressure valve actuator on the water (A) for water, inlet pipe or in brine
  • The valve will also protect the exchanger from pressure surges that may arise in the industrial systems of water supply when the valves open and close quickly
  • Possible causes for the low evaporating pressure of the Expansion valve is not installed correctly Expansion valve incorrectly adjusted Expansion valve mistakenly size Enough to hypothermia in Water or in brine flow too low Partial freezing Air in the direction of water
  • Dirt in the water side surface fouling or locked channels
  • Unevenness of distribution of refrigerant

How to determine: TEV installed upside down

  • If the expansion valve equalization of pressure with internal is installed upside down, dirt and oil can gather above the diaphragm. This can increase overheating and make the operation of the valve slower
  • The thermostatic expansion valve with external pressure equalization there is a risk that oil will collect in the lining of pipes, impairing the operation of the valve
  • In the head with a MOP there is a risk of refrigerant evaporates from the diaphragm, which can become the reason of charge transfer

How to determine: Expansion valve incorrectly adjusted

  • Quite often the expansion valve is installed simply, without adjustments.

    This may negatively affect the performance and service life of the compressor
  • High superheat will reduce pressure boiling point (A) and, consequently, to a reduction of capacity and of the KC
  • Low superheat can lead to higher evaporating pressure (B). There is a risk wet suction gas, reducing the service life of the compressor. System refrigerant capacity and COP may be lower when part of the refrigerant evaporates in the compressor and not in the evaporator

How to determine: Expansion valve mistakenly size

  • If the outlet of expansion valve is too small, the evaporating temperature is low, reducing refrigerant capacity and systems COP
  • If the holes are too big impossible to achieve a stable and overheating. Hunting reduce the expansion valve service and the wet suction gas may cause damage to the compressor
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