EPA 608 Book Exam TYPE III CERTIFICATION

A Type III Technician or Universal Technician are certified to do what? - answermaintain, service, repair, or dispose of low-pressure appliances. Most low pressure appliances are used for what? - answermost low pressure appliances are used for comfort cooling and are subject to lower allowable leak rate. The owner and/or operator of the equipment is responsible for what? - answerfor keeping records of all leaking inspections and any completed leak repair verification tests. It is their responsibility to obtain records from the servicing company doing any work on an appliance. What should the technician do if the EPA regulations change? - answerthe Technician's responsibility is to comply with EPA regulation changes. How do low-pressure systems operate? - answerlow-pressure systems are semi-hermetic and operate below atmospheric pressure (in a vacuum). What can happen if there are leaks in the gaskets? - answerleaks in the gaskets or fittings can cause air and moisture to enter the system. Leaks must be repaired to reduce the operation of the purge unit and loss of refrigerants. What is the most efficient method of leak checking a charged low-pressure refrigeration unit? - answerto pressurize the system using controlled hot water or heater blankets. When controlled hot water and heaters blankets are not feasible, use nitrogen to increase system pressure. When pressurizing a system, you should not exceed how many psig? - answerdo not exceed 10 psig. What can happen if you exceed the psig threshold? - answerif you exceed 10 psig, you can cause the rupture disc to fail. What can you use controlled hot water or heating blankets for? - answercontrolled hot water or heating blankets can be used to raise the pressure in a low-pressure system for the purpose of opening the system for a non-major repair. What is a "major repair" under EPA regulations? - answerit means any maintenance, service or repair involving the removal of any or all of the following components: - the compressor - the condenser - the evaporator - or any auxiliary heat exchanger coil In 2019, the EPA regulations will start to require that the systems containing more than [ _____ ] pounds of refrigerants be repaired when the annual leak rate exceeds a % of the refrigerant charge. - answer50 lbs (pounds) What is the percentage threshold of comfort cooling and other types of appliances (such as dehumidifiers)? - answer10% What is the percentage threshold of commercial refrigeration? - answer20% What is the percentage threshold of industrial process refrigeration? - answer30% What must the system owner do if the leak rate exceeds the maximum % on a low-pressure system? - answerthe system owner must repair the appliance enough to bring the leak rate below the threshold, or retrofit or retire the appliance. When a system with a refrigerant charge of 50 lbs. Or more has exceeded the threshold leak rate, and will be retrofitted (replaced) using a refrigerant exempt from venting prohibitions, owners or operators have [ __ ] months to replace / retrofit the appliance. - answer18 An initial leak-test verification must be performed with [ __ ] days of an appliance exceeding the appliance leak rate. - answer30 An initial leak-test verification must be performed with [ __ ] days if an industrial process shutdown is required of an appliance exceeding the appliance leak rate. - answer120 The follow up leak-test must be performed within [ __ ] days of the initial leak-test. - answer10 How do you calculate the total system refrigerant charge when calculating the leak rate? - answerby adding the charge for each component and the piping. Each time the system is topped off or recharged, the leak rate must be recalculated. All records for leak inspections, initial verification, verification tests, and records of recovered refrigerant from equipment with [ _ ] to [ _ ] ibs. Of refrigerant must be kept for 3 years just as in Type II appliances. - answer5 - 50 A recovery unit's high-pressure cut-out is set for [ _ ] psig when evacuating the refrigerant from a low-pressure chiller and rupture disc on a low-pressure recovery vessel relieves at [ _ ] psig. - answer10 psig, 15 psig Refrigerant recovery from a system using R-11 or R-123 start with what? - answerstart with liquid removal and is followed by vapor recovery. What happens to an appliance after liquid is removed? - answera substantial amount of vapor will remain in the appliance after all liquid is removed. For example, an average 350 ton, R-123 chiller at 0 psig still contains approximately 100 lbs. Of vapor after all the liquid has been removed. Most low-pressure recovery machines utilize what? - answera water-cooled condenser that is connected to the potable or municipal water supply. How can you reduce the recovery time for low-pressure machines? - answerby using a water-cooled recovery machine and cooling recovery cylinder. How can you reduce the recovery time for refrigerants? - answerincreasing the temperature in an equipment room. When recovering refrigerants, the system water pumps, the recovery compressor, and the recovery condenser water do what? - answershould all be on circulating water to prevent freezing. What should you do if a chiller is suspected of tube leaks? - answerthe water sides of the evaporator and condenser should be drained prior to recovering the refrigerant. According to the ASHRAE Guideline 3, when should the system be leak checked? - answerif the pressure in a system rises from 1 mm Hg to a level above 2.5 mm Hg during vacuum testing, the system should be leak checked. What temperature (in Fahrenheit) needs to be attained when removing oil from a low-pressure system? - answer130 What are some recharging techniques? - answeralways read the nameplate and look for labels attached to a system to help identify the type of refrigerant used and the total charge. Technicians maintaining, servicing, repairing or disposing of low-pressure appliances must be certified as - answertype III Technician or a Universal Technician. As of November 14, 1994, the sale of CFC and HCFC refrigerants is restricted to - answercertified 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 - answerair 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? - answercontrolled hot water or heater blankets When controlled hot water or heater blankets are not feasible then nitrogen may be used to increase pressure. - answertrue When pressurizing a system, do not exceed - answer10 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? - answerdrain valve To leak test a tube use a? - answera hydrostatic tube test kit Systems with open drive compressors are prone to leaks at the shaft seal. - answertrue Controlled