EPA 608 FINAL EXAM NEWEST UPDATE 2025

When using NITROGEN in any HVAC application what is always required? - Correct Ans-REGULATOR Flaring (Flared Fittings) are classified as what kind of connection? - Correct Ans MECHANICAL/ COMPRESSION (Bell Shape) Swaging is a method of expanding copper to create what kind of connection? - Correct Ans-BRAZED/WELDED What is the purpose of a nitrogen purge when brazing? - Correct Ans-To prevent OXIDATION of the copper. Approximately what PSI should a tech's Nitrogen purge be set when brazing?? - Correct Ans-1- 2 PSI CFCs & HCFCs when exposed to open flame or very hot surface can produce what hazard? - Correct Ans-PHOSGENE GAS What is the purpose of a system pressure test after conducting a sealed system repair? - Correct Ans-To IDENTIFY LEAKS in the system When conducting a system pressure test, what is used to pressurized the system?? - Correct Ans-NITROGEN Which leak detection method is best for Pinpointing leak location?? - Correct Ans-SOAP BUBBLE METHOD Which leak detection method is best for generalized leak detection?? - Correct Ans Electronic leak detector / Ultrasonic leak detector ASHRAE SAFTEY #15 - Correct Ans-Mechanical Safety ASHRAE - Correct Ans-The American Society of Heating, Refrigerating and Air Conditioning Engineers Ozone in made of what atoms? - Correct Ans-3- OXYGEN ATOMS Which chemical in CFCs and HCFCs destroys ozone?? - Correct Ans-CHLORINE What kind of problem is ozone depletion?? - Correct Ans-GLOBAL EPA 608 EPA 608 Which of the following is used as the baseline measurement for "Global Warming Potential?? - Correct Ans-CARBON DIOXIDE The "MONTREAL PROTOCOL" is a treaty which: - Correct Ans-Addresses ozone depleting substances and their ALTERNATIVES. The "Clean Air Act" sets the standards and regulations for: - Correct Ans-The handling and use of refrigerant/ Air emissions from stationary & mobile sources. Recovery tanks for refrigerant must be all of the following (EXCEPT) - Correct Ans Filled to 95% capacity Which of the following is an ACTIVE recovery process?? - Correct Ans-Using a RECOVERY MACHINE to move refrigerant. System-dependent recovery methods are considered to be: - Correct Ans-PASSIVE RECOVERY METHODS If a system has been contaminated by multiple refrigerants what must be done?? - Correct Ans-All refrigerants must be recovered into a separate recovery tank and turned in for reclaiming. Reclaiming is the process of: - Correct Ans-Restoring refrigerant to original state, requiring chemical analysis. Recycling in the process of: - Correct Ans-Cycling refrigerant through multiple filters for immediate re-use. The purpose of pulling a Vacuum on a system is to: - Correct Ans-Remove moisture and non-condensables from the system. When evacuating (Pulling a vacuum on) a system the use of a severely overside vacuum pump could - Correct Ans-Cause trapped water to freeze. Moisture combine with refrigerant and oil under high temperatures and pressures to form: - Correct Ans-Hydrofluoric & Hydrochloric Acid A proper Vacuum Should be pulled to: - Correct Ans-500 Microns Blending refrigerants should be charged in what state due to fractionation?? - Correct Ans-LIQUID What readings do we use to determine if a system is properly charged?? - Correct Ans Superheat & Subcool EPA 608 EPA 608 Where should we find information on which refrigerant should be used in a system?? - Correct Ans-Unit manufacture DATA PLATE. Which is the formula for calculating SUPERHEAT?? - Correct Ans-Suction Line Temperature - Suction Saturation Temperature Which is the formula for calculating SUBCOOL?? - Correct Ans-Liquid Saturation Temperature - Liquid Line Temperature When can a tech find refrigerant saturation temperatures?? - Correct Ans-By using a pressure/ temperature chart. The inner rings on MANIFOLD GAUGES: A fixed orifice (Piston) metering device is charged based on: - Correct Ans SUPERHEAT A expansion valve meter devices are generally charged based on: - Correct Ans SUBCOOL What are the steps to a sealed system repairs?? - Correct Ans-Recover, Repair, Press, Test, Vacuum, Charge, Check System, Collect What are 3 things needed for combustion to occur? - Correct Ans-Oxygen, Heat, Fuel Carbon Monoxide is a byproduct of: - Correct Ans-Incomplete combustion Carbon Monoxide levels are measured in: - Correct Ans-Part per million (PPM) The drip leg (Sediment Trap) functions as a trap for which of the following?? - Correct Ans-Dirt, Glue Debris, Moisture The inducer fan maintains what kind of pressure through the heat exchanger?? - Correct Ans-NEGATIVE A thermocouple (Flame Sensor) is used to: - Correct Ans-Confirm flame during heat operation What is the purpose of a thermal limit (high limit) switch in heating equipment?? - Correct Ans-To kill power to the system when unsafe temperatures are reached. Category I mid-efficiency gas furnaces (AFUE 80%) vent combustion gasses. - Correct Ans-With double wall Metal Class "B" vent material. Category IV high-efficiency gas furnaces (AFUE 90%) vent combustion gasses: - Correct Ans-With PVC venting material. EPA 608 In a gas furnace SEQUENCE of operation what happens third?? - Correct Ans-Inducer tuns on. How many metering devices does a heat pump system have? - Correct Ans-TWO Which component in a heat pump facilitates changing the direction of refrigerant flow?? - Correct Ans-REVERSING VALVE What is the purpose of the defrost board in a heat pump system?? - Correct Ans-To detect freezing of the outdoor coil and initiate the thawing process. Auxiliary electric heat is necessary in a heat pump system to: - Correct Ans-Provide heat for the home during defrosts. Provide heat for the home if heat pump fails. Provide heat for the home if heat pump cannot meet demand. 10% - Correct Ans-COMFORT COOLING 20% - Correct Ans-COMMERCIAL REFRIGERENT 30% - Correct Ans-INDUSTRIAL POGRESSIVE REFRIGERENT RECOVERY - Correct Ans-Take out refrigerant and put it back in RECYCLE - Correct Ans-Filter refrigerant RECLAIM - Correct Ans-NEW REFRIGERANT 0 Very High Pressure Refrigerant - Correct Ans-C02/ R-744 0 High Pressure - Correct Ans-Less than 200 Lbs 10 ing High Pressure - Correct Ans-More than 200 Lbs 10 ing MED Pressure - Correct Ans-Less than 200 Lb