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Summary (Answered) EPA Section 608 Technician Certification Study Guide: AHRI study guide third edition questions bank. What are the typical uses of the center port of gauge set? ✔✔ Used during evacuation, charging and recovery procedures. What color are the gauges on a manifold gauge set? ✔✔ 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? ✔✔ 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? ✔✔ High pressure, liquid. Is the refrigerant entering the expansion valve (variable metering device) a liquid or gas? ✔✔ Liquid, high pressure. Is the pressure of the refrigerant entering the compressor high or low? ✔✔ Low pressure vapor. Where in a refrigerant circuit does a liquid boil to absorb heat? ✔✔ In the evaporator. The refrigerant in the suction line is a gas that has been heated above its saturation. What is this condition called? ✔✔ Superheated vapor. What can cause liquid refrigerant to migrate to a compressor crankcase? ✔✔ 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? ✔✔ Operating while in a deep vacuum or when the service valves are closed. What system failures require taking an oil sample? ✔✔ A compressor burnout or if the unit has had a leak. Is flushing with refrigerant an acceptable tube cleaning method? ✔✔ No. In addition to preventing and repairing leaks what else should a technician do to conserve refrigerant? ✔✔ Recover and recycle used refrigerants. What factors affect the speed of an evacuation? ✔✔ 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. How should gauge set hoses be sized for use in evacuating a system? ✔✔ Use the shortest length and the largest diameter possible for the quickest evacuation. At least as large as the vacuum pump inlet. When evacuating what is the benefit of using short hoses with large diameters? ✔✔ Reduces emissions, pressure drop and evacuation time. Which connection determines the preferred size of hoses used with a vacuum pump? ✔✔ The vacuum pump inlet. As the capacity and suction hose size increase what happens to the time needed for an evacuation? ✔✔ Time is reduced. What purpose is served by heating a system during dehydration? ✔✔ To speed up moisture removal. Does a thorough evacuation remove moisture from a system? ✔✔ Yes. What can happen to oil in the compressor if the moisture is left in an operating system? ✔✔ The oil will form hydrofluoric and hydrochloric acids which will corrode the internal parts of the system. What is the result of over-evacuating a system? ✔✔ No damage will be done. How can a system be leak checked using a low pressure gauge? ✔✔ Vacuum reading will rise when vacuum pump is turned off. How close should the vacuum gauge be connected to the vacuum pump during evacuation? ✔✔ As far away as possible. When measuring the vacuum of a system being evacuated the system must be isolated. What must be done to the vacuum pump? ✔✔ Turn it off and valve it off.

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