EPA SECTION 608 TYPE III (2024 revision)

Identify the pressure corresponding to 32F for R-123 - answer20 inches of Hg vacuum Refrigerant is added to a centrifugal machine through the - answerevaporator charging valve What precaution should be taken prior to recovering refrigerant from a chiller suspected of having tube leaks? - answerdrain the water sides of the evaporator and condenser Where does refrigerant go after it leaves the purge unit of a low pressure centrifugal system - answerthe evaporator A charged low pressure refrigeration system can be efficiently leak checked by - answerraising system pressure by heating with circulated hot water or heating blankets To determine how much vapor to charge into an evacuated chiller, you should charge with vapor until - answerthe system pressure corresponds to a refrigerant saturation temperature of 36F After recovering the liquid refrigerant you must - answerrecover the vapor refrigerant A rupture disc on a recovery vessel for low pressure refrigerants relieves at - answer15 psig The discharge from a rupture disc should be piped - answeroutdoors for venting According to the EPA, there is approximately ________ refrigerant vapor left in an average 350 ton R-11 chiller at 0 psig pressure once all the R-11 liquid has been removed? - answer100 lbs When there is excessive moisture collecting in the purge unit of a low pressure refrigeration system, this indicates that the - answercondenser or chiller barrel tubes are leaking R-11 at a pressure of 17 inches Hg vacuum has a saturation temperature of - answer35f The maximum test pressure for leak testing a low pressure centrifugal is - answer10 psig R-11 at 14.7 PSIA will boil at about - answer74.5F According to ASHRAE Guideline 3-1996, if the pressure in a system rises from 1 mm Hg to a level above _______ during a standing vacuum test, the system should be checked for leaks. - answer2.5 mm Hg If you suspect a leak in the water box of a chiller, you should place the leak detector probe _____________, and sniff for refrigerants. - answerthrough a drain valve The purge unit takes its suction from the - answertop of the condenser When installing more than one, pressure relief valves must be installed; A.) In series with each other. B.) In parallel with each other. C.) In the system's suction line. D.) On top of compressor head. - answerc.) In parallel with each other In a low-pressure chiller, air and other non-condensables collect at the; A.) Bottom of the compressor B.) Top section of the condenser C.) Bottom fo the evaporator D.) Header before the metering device. - answerb.) Top section of the condenser Because a low-pressure system operates below atmospheric pressure (in a vacuum), A.) The system is unlikely to have air and moisture enter the system. B.) Leaks in gaskets or fittings will cause air and moisture to enter the system. C.) Leaks in the gaskets or fittings will cause substantial refrigerant leaks. D.) Leaks in the gaskets or fittings will cause oil clogging at the condenser. - answerb.) Leaks in gaskets or fittings will cause air and moisture to enter the system. Where is the purge unit located in a low-pressure system? A.) The top of the condenser B.) In the lowest location. C.) Above the shell. D.) Before the oil operator. - answera.) The top of the condenser When LEAK TESTING a low-pressure chiller, the maximum pressure to use is; A.) 5 psig B.) 10 psig C.) 15 psig D.) 20 psig - answerb.) 10 psig What type of equipment can be worked on with Type III certification? A.) High-pressure B.) Medium-pressure C.) Low-pressure D.) Vacuum pressure - answerc.) Low-pressure To repair a chiller operating with R-22 the technician; A.) Does not need a certification B.) Must have a Type I certification C.) Must have a Type II certification D.) Must have a Type III certification - answerc.) Must have a Type II certification Under ASHRAE Standard 34, R-134a is classified as; A.) A1 B.) A2 C.) B1 D.) B2 - answera.) A1 The most efficient method of leak checking low-pressure refrigeration unit is to; A.) Pressurize the system using controlled hot water or heater blankets B.) Pull a 500 micron vacuum and hold for at least 12 minutes. C.) Pull a 20-inch vacuum and hold for at least 24 hours D.) Pull a 29.9 inch vacuum and hold for at least 24 hours. - answera.) Pressurize the system using controlled hot water or heater blankets. If a strong odor is detected during the recovery process, A.) The refrigerant is most likely R-717 (Ammonia). B.) The purge unit on the condenser has opened C.) A compressor burn-out may have occurred. D.) It is a good indicator that R-123 is the refrigerant being recovered. - answerc.) A compressor burn-out may have occurred. When charging a low-pressure system, refrigerant should be introduced to the system as a vapor to raise the system's saturation temperature to a minimum of; A.) 0 degrees B.) 36 degrees C.) 40 degrees D.) 70 degrees - answerb.) 36 degrees After all the liquid has been removed from an average 350-ton, low-pressure appliance, approximately how much vapor refrigerant remains in the system? A.) 100 pounds B.) 150 pounds C.) 350 pounds D.) 45 pounds - answera.) 100 pounds Where is refrigerant added to a low-pressure system during the charging process? A.) The access valve on the purge unit entering the condenser. B.) The lowest access point on the system such as the condenser charging valve. C.) The highest access point on the system such as the evaporator inlet valve. D.) The lowest access point on the system such as the evaporator charging valve. - answerd.) The lowest access point on the system such as the evaporator charging valve. The Standard for machine room safety is; A.) ASHRAE-15 B.) ASHRAE-34 C.) AHSRAE-740 D.) EPA-740 - answera.) ASHRAE 15 The rupture disk on a low-pressure chiller has a burst pressure of; A.) 5 psig B.) 10 psig C.) 15 psig D.) 20 psig - answerc.) 15 psig A low pressure chiller used for comfort cooling must be repaired if it has an annual leak rate of ____ of the total charge. A.) 10 percent B.) 20 percent C.) 30 percent D.) 50 percent - answera.) 10 percent The owner must keep records of refrigerant added to a low-pressure system during service and maintenance if the system charge is; A.) 25 pounds or greater B.) 50 pounds or greater C.) 100 pounds or greater D.) 150 pounds or greater - answerb.) 50 pounds or greater During evacuation of systems with large amounts of water, it may be necessary to; A.) Increase pressure by introducing nitrogen to counteract freezing. B.) Pu