HVAC - EPA Certification Exam Challenge with Certified Answers 2023 Update., Exams of Nursing

Download HVAC - EPA Certification Exam Challenge with Certified Answers 2023 Update. and more Exams Nursing in PDF only on Docsity! HVAC - EPA Certification Exam Challenge with Certified Answers 2023 Update. Clean Air act - 608 EPA - Environmental Protection Agency - Correct Answer to minimize the quantity of refrigerants released to the atmosphere, and to maximize the recovery and recycling of refrigerants during the servicing and disposal of mobile and stationary air conditioning and refrigeration equipment. ozone - Correct Answer a layer in the earth's stratosphere at an altitude of about 6.2 miles (10 km) containing a high concentration of ozone, which absorbs most of the ultraviolet radiation reaching the earth from the sun. chlorine - Correct Answer the chemical element of atomic number 17, a toxic, irritant, pale green gas. freon - Correct Answer a gas at room temperature and a liquid when cooled or compressed. Freon gas is colorless, non-flammable and relatively odorless. Some Freon gases have an ether-like odor. HVAC - EPA Certification Exam Challenge with Certified Answers 2023 Update. Four categories of certification - Correct Answer 1. Type I - small appliances 2. Type II - high pressure appliances 3. Type III - low pressure appliances 4. Universal - both low & high pressure and small appliances refrigeration - Correct Answer movement of heat from an area where it is not wanted to an area where it is less objectionable vapor/compression refrigeration cycle - Correct Answer may be defined as lowering the temperature of an enclosed space by removing heat from that space and transferring it elsewhere. A device that performs this function may also be called an air conditioner, refrigerator, air source heat pump, geothermal heat pump or chiller (heat pump). gauge manifold set - Correct Answer allows the HVAC technician to check central air conditioning unit operating pressures, transfer Ac HVAC - EPA Certification Exam Challenge with Certified Answers 2023 Update. HCFCs hydro-chloro-fluoro-carbon HFCs hydro-fluoro-carbon - Correct Answer compounds consisting of hydrogen, chlorine, fluorine, and carbon atoms. HCFCs and hydrofluorocarbons (HFCs) were created in the 1980s as substitutes for chlorofluorocarbons (CFCs) for use in refrigeration and a wide variety of manufacturing processes. HCFCs - R-22, 123 HFCs - R-134a ozone depletion potential (ODP) - Correct Answer measurement of CFCs and HCFCs ability to destroy ozone HVAC - EPA Certification Exam Challenge with Certified Answers 2023 Update. The Montreal Protocol - Correct Answer - a treaty regulating use and production of CFCs and HCFCs - reduction and phase-out of ozone depleting substances - Three Rs - Recover, Recycle, Reclaim Recover - Correct Answer remove and store refrigerant in external container Recycle - Correct Answer cleaning refrigerant to reuse by separating oil from refrigerant and removing moisture Reclaim - Correct Answer process refrigerant to level equal to new specs "System dependent" recovery - Correct Answer captures refrigerant with assistance of components in the appliance from which refrigerant is recovered HVAC - EPA Certification Exam Challenge with Certified Answers 2023 Update. "Self-contained" recovery - Correct Answer has own means to draw refrigerant out of appliance Sales restriction - Correct Answer CFCs and HCFCs sold only to licensed technicians azeotropic - Correct Answer mixture that acts like a single component refrigerant over its entire temperature/pressure range ternary blends - Correct Answer three part blend used with alkylbenzene lubricant hydroscopic - Correct Answer high affinity for water (highly attracted to water) HVAC - EPA Certification Exam Challenge with Certified Answers 2023 Update. 2. ambient temperature 3. amount of moisture in system 4. size of vacuum pump/suction line system vacuum gauge - Correct Answer connected as far away from vacuum pump as possible recovery cylinders - Correct Answer - specifically designed to be refilled - 2 ports: one liquid/one vapor - NOT FILLED ABOVE 80% - hydrostatically tested/ stamped every 5 years - DOT approves with yellow top/grey body relief valves - Correct Answer - downstream line from pressure regulator - NOT installed in series HVAC - EPA Certification Exam Challenge with Certified Answers 2023 Update. Schrader valves - Correct Answer check valve cores for leaks, bends, & breakage SCBA - Correct Answer Self-Contained Breathing Apparatus; used in event of large refrigerant leak transportation - Correct Answer DOT standards: - upright position - "2.2 non-flammable gas" tag BEFORE 1993 equipment requirements - Correct Answer - capable of removing 80% of refrigerant - achieve 4 inch vacuum under ARI 740 - certified AFTER 1993 equipment requirements - Correct Answer - EPA certified./ listed (UL, E.T.L.) HVAC - EPA Certification Exam Challenge with Certified Answers 2023 Update. - capable of recovering 90% WITH compressor - capable of recovering 80% WITHOUT compressor or achieve 4 inch vacuum under ARI 740 small appliances - Correct Answer leak repair NOT required, but should be done when possible mixed refrigerant - Correct Answer DO NOT mix refrigerant during recovery procedures non-condensables - Correct Answer with self-contained recovery system be sure to have tank inlet valve open to release non- condensables (air) self-contained recovery system - Correct Answer has its own means of removing refrigerant from appliances can reach required recovery rates with ot without operable compressor HVAC - EPA Certification Exam Challenge with Certified Answers 2023 Update. graduated charging cylinder (with regulated refrigerant) - Correct Answer refrigerant vapor vented off top of cylinder must be recovered Installation of ANY system - Correct Answer pressurized with nitrogen and leak checked open compressor system - Correct Answer may leak at rotating shaft seal traces of oil - Correct Answer indicator of refrigerant leak comfort cooling devices - Correct Answer more than 50 lbs of refrigerant MUST be repaired with annual leak over 15% commercial & industrial cooling devices - Correct Answer more than 50 lbs of refrigerant MUST be repaired with annual leak over 35% HVAC - EPA Certification Exam Challenge with Certified Answers 2023 Update. before using recovery unit - Correct Answer CHECK: - service valve positions - oil level of recovery unit Evacuate and recover remaining refrigerant R-134a Recovery - Correct Answer requires special set of hoses, gauges, vacuum pump, recovery and recovery/recycling machine, and oil containers used for R134a ONLY vapor phase recovery - Correct Answer minimizes loss of oil liquid phase recovery - Correct Answer reduces recovery time unit with receiver/storage tank - Correct Answer - refrigerant should be placed in RECEIVER - begin recovery with liquid line entering evaporator HVAC - EPA Certification Exam Challenge with Certified Answers 2023 Update. returning refrigerant after recovery - Correct Answer may be returned to appliance it was taken from or another appliance owned by same person after November 15, 1993 - Correct Answer recovery and recycling equipment must be certified and labelled by EPA approved testing organization parallel compressor system (PCS) - Correct Answer you MUST isolate PCS to avoid open equalization connection major repair - Correct Answer maintenance involving removal of any of the following: - compressor - condenser - evaporator HVAC - EPA Certification Exam Challenge with Certified Answers 2023 Update. low-pressure system (vacuum) - Correct Answer leaks will cause air and moisture to enter system "major repair" to EPA - Correct Answer maintenance, service or repair involving removal of any or all of following: - compressor - condenser - evaporator - heat exchanger coil R-11 or R-123 recovery - Correct Answer starts with liquid removal followed by vapor recovery; substantial vapor will remain in system HVAC - EPA Certification Exam Challenge with Certified Answers 2023 Update. ASHRAE Guideline 3-1996 - Correct Answer if pressure system rises from 1mm Hg to a level above 2.5mm Hg durng vacuum testing LEAK CHECK the system ASHRAE Safety Classification - Correct Answer Higher flammability A3 - B3 Lower flammability A2 - B2 No Flame propagation A1 - B1 Lower Toxicity Higher Toxicity 130 degrees - Correct Answer temperature necessary when removing oil from low-pressure system evaporator charging valve - Correct Answer for adding refrigerant; HVAC - EPA Certification Exam Challenge with Certified Answers 2023 Update. lowest access point on the system R-11 system - Correct Answer before charging with liquid: - vapor pressure 16.9" hg - 36 degrees fahrenheit low loss fittings - Correct Answer must be present on recovery equipment to minimize refrigerant loss - before Nov 15, 1993 - 25 inches Hg - after Nov. 15, 1993 - 25 mm Hg absolute counteract frerezing - Correct Answer increase pressure with nitrogen in systems with lots of water purge unit - Correct Answer removes non-condensables from system