MAT 2010 - Introduction to System Service

• Describe a standing pressure test.
• Describe the six classes of leaks.
• Explain the test procedures for evaporator and condenser section leaks.
• Explain the test procedures for suction and liquid-line leaks.
• Explain the test procedures for temperature-, pressure-, and vibration-dependent leaks.
• Choose a leak detector for a particular type of leak.
• Describe a deep vacuum.
• Describe two different types of evacuation.
• Describe a wireless, digital, micron vacuum gauge.
• Describe two different types of vacuum measuring instruments.
• Describe how wireless, Bluetooth technology can be used in an evacuation process.
• Choose the correct high-vacuum pump.
• List some of the proper evacuation practices and techniques.
• Describe a deep-vacuum single evacuation.
• Describe a triple evacuation.
• Explain the process involved in cleaning a system after a hermetic motor burnout.
• 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.