Unit 10: System Charging

Objectives


  • After studying this unit, you should be able to
  • describe how refrigerant is charged into systems in the vapor and liquid states.
  • state the advantage of using electronic scales for weighing refrigerant into a system.
  • describe the terms “temperature glide” and “fractionation” as they apply to blended refrigerants.
  • charge air-conditioning systems with fixed orifice, capillary tube, or piston-type metering devices using charging charts and curves.
  • use the subcooling method of charging to charge air-conditioning and heat pump systems that incorporate a thermostatic expansion valve (TXV) as the metering device.
  • use temperature/pressure charts to help properly charge air-conditioning and refrigeration systems.
  • differentiate between “bubble point” and “dew point” values on a temperature/pressure chart and properly use these values to calculate superheat and subcooling values on systems that operate with blended refrigerants.


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