EPA 608 Book Exam TYPE III CERTIFICATION CORRECT 100%(SCORED A+)

Technicians maintaining, servicing, repairing or disposing of low-pressure appliances must be certified as - ANSWER Type III Technician or a Universal Technician. As of November 14, 1994, the sale of CFC and HCFC refrigerants is restricted to - ANSWER Certified technicians, NOTE: If EPA regulations change after the technician is certified, it will be the technician's responsibility to comply with any future changes. Because a low-pressure system operates below atmospheric pressure (in a vacuum), leaks in the gaskets or fittings will cause - ANSWER Air and moisture to enter the system The most efficient method of leak checking a charged low-pressure refrigeration unit is to pressurize the system by the use of? - ANSWER Controlled hot water or heater blankets When controlled hot water or heater blankets are not feasible then nitrogen may be used to increase pressure. - ANSWER True When pressurizing a system, do not exceed - ANSWER 10 psig, exceeding 10 psig can cause the rupture disc to fail. When leak testing a water box, be certain the water has been removed before placing the leak detector probe through the? - ANSWER Drain valve To leak test a tube use a? - ANSWER A hydrostatic tube test kit Systems with open drive compressors are prone to leaks at the shaft seal. - ANSWER True Controlled hot water can be used to pressurize a system for the purpose of opening the system for? - ANSWER A non-major repair Under EPA regulations, a "major repair" means any maintenance, service or repair involving the removal of any or all of the following components - ANSWER The compressor, the condenser, the evaporator or any auxiliary heat exchanger coil. EPA regulations require that all comfort cooling appliances containing more than _____ of refrigerant be repaired when the annual leak rate exceeds ________. - ANSWER 50 lbs. and 15% EPA regulations require all commercial and industrial process refrigeration containing more than ______ of refrigerant be repaired when annual leak rate exceeds ? - ANSWER 50 lbs. and 35% A recovery unit's high pressure cut-out is set for _____ when evacuating the refrigerant from a low-pressure chiller and a rupture disc on a low-pressure recovery vessel relieves at __________. - ANSWER 10 psig and 15 psig Refrigerant recovery from a system using R-11 or R-123 starts with? - ANSWER Liquid removal and is followed by vapor recovery A substantial amount of vapor will remain in the appliance after all liquid is removed. For instance, an average 350 ton R-11 chiller at 0 psig still contains 100 lbs. of vapor after all the liquid has been removed. - ANSWER True Water must be circulated through the tubes when evacuating refrigerant in order to prevent freezing the water. - ANSWER True Most low pressure recovery machines utilize a water-cooled condenser that is connected to the municipal water supply. - ANSWER True