EPA 608 Type 3

Type 3 - answer-Technicians maintaining, servicing, repairing or disposing of low-pressure appliances must be certified as a universal technician or a _______ ___. Enter - answer-Because a low-pressure system operates below atmospheric pressure (in a vacuum), leaks in the gaskets or fittings will cause air and moisture to ______ the system. Heater - answer-The most efficient method of leak checking a charged, low-pressure refrigeration unit is to pressurize the system by the use of controlled hot water or ______ blankets. Nitrogen - answer-When unable to heat a low-pressure system for leak-checking, use ______ to increase pressure. 10 - answer-When pressurizing a low-pressure system with nitrogen, do not exceed _____ psig. Rupture - answer-Exceeding 10 psig when pressurizing a low-pressure system, can cause the _____ disc to fail. Removed - answer-When leak testing a water box, be certain the water has been ______ before placing the leak detector probe through the drain valve. Hydrostatic - answer-When leak-testing a tube, use a _______ tube test kit. Seal - answer-Systems with open drive compressors are prone to leaks at the shaft _____. Hot - answer-For the purpose of opening the system for a non-major repair, controlled ______ water can be used to pressurize a system. High pressure - answer-A recovery unit's _____ _____ cut-out is set for 10 psig when evacuating the refrigerant from a low-pressure chiller. 15 - answer-A low-pressure chiller and a rupture disc on a low-pressure recovery vessel relieves at _____ psig. Liquid vapor - answer-Refrigerant recovery from a system using R-11 or R-123 starts with ______ removal and is followed by _____ recovery. Vapor - answer-A substantial amount of _____ will remain in the appliance after all liquid is removed. 100 - answer-An average 350 ton R-11 chiller at 0 psig still contains _____ lbs. Of vapor after all the liquid has been removed. Circulated - answer-Water must be ______ through the tubes when evacuating refrigerant in order to prevent freezing the water. Condenser - answer-Most low-pressure recovery machines utilize a water-cooled ______ that is connected to the municipal water supply. On - answer-When recovering refrigerant, the system water pumps, the recovery compressor, and the recovery condenser water should all be ______. Drained - answer-If a chiller is suspected of tube leaks, the water sides of the evaporator and condenser should be ______ prior to recovering the refrigerant. 2.5 - answer-The ASHRAE Guideline 3-1996 states that if the pressure in a system rises from 1 mm Hg to a level above ____ mm Hg during vacuum testing, the system should be leak checked. 130 - answer-A temperature of _____ F should be attained when removing oil from a low-pressure system. Oil - answer-Less refrigerant is contained in the _____ at the higher temperature of 130 degrees F. Lowest - answer-Refrigerant is added through the _____ access point in the system. Evaporator - answer-The ______ charging valve is the lowest access point in the system. Liquid - answer-Introducing _______ refrigerant into a deep vacuum will cause it to boil. Freeze - answer-Allowing liquid refrigerant to boil, when charging, may lower temperature enough to ________ water in the tubes. Vapor - answer-To avoid freezing water in the tubes, initial charging of a low-pressure system is in the ______ phase. 16.9 36 - answer-Before charging with liquid, an R-11 refrigeration system requires a vapor pressure of _____ Hg vacuum, or a saturation temperature of _____ degrees F. 25 inches Hg - answer-Using recovery or recycling equipment manufactured or imported before November 15, 1993 the required level of evacuation is ____ _____ _____ 25 mm Hg absolute - answer-Using recovery or recycling equipment manufactured or imported after November 15, 1993 the required level of evacuation is ____ _____ _____ _____ System pressure - answer-Once the required vacuum has been achieved, the technician should wait for a few minutes and monitor the ______ ______. Refrigerant - answer-After achieving the required vacuum, if the pressure rises, it indicates that there is _______ remaining in the system. Repeated - answer-After achieving the required vacuum, if the pressure rises, indicating that there is pressure remaining in the system, recovery must be _______. Lowest attainable level - answer-When leaks in an appliance make evacuation to the prescribed level unattainable prior to a major repair, the appliance should be evacuated to the _____ ______ ______. Freeze - answer-The use of a large vacuum pump could cause trapped water to _____. Counteract - answer-During evacuation of systems with large amounts of water, it may be necessary to increase pressure by introducing nitrogen to ______ freezing. Purge unit - answer-Because chillers using refrigerants such as CFC-11 and HCFC 1