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May Tech Challenge

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A commercial rooftop with R-410A refrigerant and a fixed orifice feed device has a customer complaint of insufficient cooling. The symptoms confirm a warm space and the compressor appears to be running continuously. What are the “possible causes” with the following measured conditions on this field service check sheet? (Note: There is only one problem intended.) 

Field Service Check Sheet 

  • Compressor Discharge Temp. 205 deg. F. 
  • Condensing Press./Temp. 338 psig / 104 deg. F. 
  • Condensing Outlet Temp. 90 deg. F. 
  • Condenser Sub cooling 14 deg. F. 
  • Condenser Split 16 deg. F. 
  • Entering Feed Device Temp. 50 deg. F. 
  • Evaporator Press./Temp. 55 psig / 32 deg. F. 
  • Evaporator Outlet Temp. 68 deg. F. 
  • Evaporator Superheat 36 deg. F. 
  • Compressor Inlet Temp. 78 deg. F. 
  • Total S. H. 46 Deg. F. 
  • Ambient Temp. 88 deg. F. 
  • Room/Box Temp. 80 deg. F. 
  • Compressor Volts 240 V. 
  • Compressor Amp. Draw Low 


Check back during the first week of June for the answer!

Posted In: Tech Challenge

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