EPA Section 608 Technician Certification Study Guide (A+ Guaranteed)

What are the typical uses of the center port of gauge set? correct answers Used during evacuation, charging and recovery procedures. What color are the gauges on a manifold gauge set? correct answers Low pressure is blue, High pressure is red. What are the typical ranges of pressure measurements used on the gauges of a manifold gauge set? correct answers High side is 0 to 500 PSIG; Low side is 0 to 350 PSIG and 0 to 30 in. Hg below atmospheric pressure. Is the refrigerant leaving a condenser at a high or low pressure? Is it a liquid or a gas? correct answers High pressure, liquid. Is the refrigerant entering the expansion valve (variable metering device) a liquid or gas? correct answers Liquid, high pressure. Is the pressure of the refrigerant entering the compressor high or low? correct answers Low pressure vapor. Where in a refrigerant circuit does a liquid boil to absorb heat? correct answers In the evaporator. The refrigerant in the suction line is a gas that has been heated above its saturation. What is this condition called? correct answers Superheated vapor. What can cause liquid refrigerant to migrate to a compressor crankcase? correct answers If the compressor is located in the coldest location in the circuit. List two conditions that can quickly damage a compressor that is starting to run? correct answers Operating while in a deep vacuum or when the service valves are closed. What system failures require taking an oil sample? correct answers A compressor burnout or if the unit has had a leak. Is flushing with refrigerant an acceptable tube cleaning method? correct answers No. In addition to preventing and repairing leaks what else should a technician do to conserve refrigerant? correct answers Recover and recycle used refrigerants. What factors affect the speed of an evacuation? correct answers Pump size, hose length, hose diameter, size of system to be evacuated, ambient temperature, suction line size, and the amount of moisture in the system.