EPA 608 Type 3 study guide

B - answer-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 A - answer-The most efficient method of leak checking a charged 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 B - answer-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 B - answer-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 C - answer-To repair a chiller operating with R-22, the technician; A. does not need a certification B. must have a Type 1 certification C. must have a Type 2 certification D. must have a Type 3 certification B - answer-How long would an equipment owner or operator have to retrofit or retire an appliance that has exceeded the threshold leak rate if the replacement appliance uses 50 pounds or more of an exempt refrigerant? A. 24 months B. 18 months C. 12 months D. 3 months A - answer-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 separator D - answer-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 B - answer-When pressurizing a low-pressure system for leak-detection purposes, do not exceed A. 5 psig B. 10 psig C. 15 psig D. 20 psig C - answer-What type of equipment can be worked on with Type 3 certification? A. High-pressure B. Medium-pressure C. Low-pressure D. Vacuum pressure A - answer-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 C - answer-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 A - answer-Under ASHRAE Standard 34, R-134a is classified as; A. A1 B. A2 C. B1 D. B2 B - answer-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 B - answer-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 the 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 C - answer-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 C - answer-Which of the following refrigerants has a safety classification of B-1 A. CFC-12 (R-12) B. HFC-134a (R-134a) C. HCFC-123 (R-123) D. CFC-11 (R-11) C - answer-The EPA-required evacuation level for recovery or recycling equipment used on low-pressure systems is A. 15 inches Hg. B. 20 inches Hg. C. 25 mm of Hg absolute. D. 30 inches Hg absolute. A - answer-What can be used to pressurize a chiller system before opening the system for a non-major repair? A. Controlled hot water B. Nitrogen C. R-409A D. Compressed air A - answer-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 C - answer-Which organization establishes the refrigerant safety group standard? A. AHRI B. UL C. ASHRAE D. ASE B - answer-In a low-pressure chiller, air and other non-condensable at the; A. bottom of the compressor B