Which of the following is a reason to take an oil sample? Please click here to see any active alerts. A comfort-cooling appliance containing 50 pounds or more of R-22 is found to be leaking beyond the applicable leak rate threshold. Pressure relief valves can only be installed; 32 psig Evacuate the isolated section of the system to 0 psig and if system pressure does not rise after a few minutes, remove the compressor. Where must you connect a hose in order to recover liquid refrigerant? c. will be protected by its insulation if the compressor is started. Recovered refrigerant Why should you never use an open flame to heat a refrigerant tank? a. Find out how you can intelligently organize your Flashcards. by AlisiaScheurer, d. Pressurize the system with nitrogen and perform a leak check. When recovery is first started, at what phase is the refrigerant removed to save recovery time? Every refrigerating system must be protected by which of the following; What must be done before recovery? Which process applies to cleaning refrigerant for immediate reuse by oil separation and single or multiple passes through devices, like replaceable ore filters driers, which reduce moisture and acidity? Which of the following repairs would always be considered "major" under EPA's regulations? you now have to recover refrigerant from an R-410a unit. Check to see if it has leaked above the mandatory retirement threshold. Wait for at least a few minutes to see if the system pressure rises. a. Suction line and compressor port Where would you place a leak detector probe to check gas leaks into the water box with water removed? Higher suction pressure Refrigerant has been recovered from an air-conditioning system and held in a refillable cylinder, in order to replace the condenser coil, the refrigerant; What steps should be taken before using a recovery unit to remove a charge? When servicing the unit; Please select the correct language below. It must be labled as certified to meet EPA's requirements. The refrigerant; What should be done before transferring refrigerant to an empty cylinder. c. pumped into appliance receiver. Save. When recovery is first started, at what phase is the refrigerant removed to save recovery time? Liquid charging of an R-410A refrigeration system with risk of freezing is begun with vapor from a vacuum level to a pressure of approximately. of R-22 and a successful initial verification test, when must a follow-up leak verification test be conducted? d. Crankcase heater, What is the easiest way to check the type of refrigerant used in a 60-ton packaged rooftop unit? If a strong odor is detected during the recovery process. c. Pressurize with the refrigerant to be used in the system. A basketball of circumference 75.5cm75.5 \mathrm{~cm}75.5cm and mass 598g598 \mathrm{~g}598g is forced to the bottom of a swimming pool and then released. Which leak repair category does the EPA define as air conditioning appliances used to provide cooling in order to control heat and/ or humidity in occupied facilities including, but not limited to, residential, office, and commercial buildings? How would you remove moisture from refrigerant in a system? Material recovered from the exploded units had been analysed and evidence pointed to a counterfeit refrigerant being to blame for the explosions. What is the evaporation temperature of R-134a at 0 psig? c. High pressure liquid d. Replacement of a condenser fan motor. d. Use of the calculations based on the BTU capacity of the system. To avoid freezing the water contained in a water-cooled heat exchanger of an R-134a refrigeration system during charging, the system should initially be charged with R-134a vapor to a pressure of approximately; a. They do not dissolve in water or easily break down in ht atmosphere. Trapped oil can freeze. Why could a recycling or recovery machine that uses a hermetic compressor overheat when drawing deep vacuums? To minimize refrigerant release when hoses are connected and disconnected. a. When a refrigerant Trace gas becomes absolutely necessary which of the available refrigerant should be used to identify a leak? When the appliance contains over 15 pounds of refrigerant. Explain. What would be the next step(s)? Understanding how oil free air compressors work and why they last as long as they A small percentage of CFCs are still imported for medical and laboratory use, which can be seen in import reports of CFCs recorded after January 1 1996. The refrigerant should be tested for acid. How can you speed up the removal of the refrigerant charge from a system? b. a. may be charged back into the system. b. R-404A Edit Change the expansion valve on the recovery machine. a. R-134a 11th - Professional Development. a. Ammonia, carbon dioxide, and methyl chloride b. What does ozone in the stratosphere above earth consists of? What does a 608 certification allow a technician to do? To avoid freezing the water contained in a water-cooled heat exchanger of an R-134a refrigeration system during charging, the system should be initially charged with R-134a vapor to a pressure of approximately; What will non-condensables in a refrigeration system result in? An operating unit that has a receiver/storage tank requires refrigerant system service. d. A refrigerant receiver. Recovered refrigerant may contain which of the following impurities? d. nitrogen and leak checked. d. When topping off the system. These systems operate below atmospheric pressure. Pressure relief valves can only be installed3; When could a reciprocating compressor be damaged if energized? Leaks in the appliance make recovery to the prescribed level unattainable. After installation of a field piped split system, the unit should first be pressurized with? You are changing out a compressor of a system containing 40 pounds of R404A. a. When a pungent odor is detected during a sealed system recovery and/or repair which of the following is most likely? In addition to isolating the compressor, which of the following procedures should you follow? The motor relies on the flow of refrigerant through the compressor for cooling. Which of the following should be replaced if a system is opened for servicing? Can be dangerous if not used with a pressure regulator. Liquid charge through the liquid-line service valve. Unless granted additional time, how many days do you have to repair the leak and conduct the initial leak verification? There FUNCTIONAL STEPS OF HOW OIL-FREE AIR COMPRESSOR WORK? When a trace gas becomes absolutely necessary, which of the available gases should be used to help locate a leak? d. -1F, 8. What action must an owner/operator take if a supermarket system containing 50 or more pounds of R-22 leaks more than 125% of its full charge in a calendar year? What is the primary water source for a water-cooled recovery unit's condensing coil? Recover the refrigerant and leak check the appliance with a trace gas. It must be tested by an EPA-approved third party The appliance is located in an area that is subject to radiological contamination. b. Pull a vacuum. Which of the following methods can be used to pressurize an R-1233ZD system for the purpose of opening the system for non-major repairs? Determining the type of refrigerant. An operating unit that has a receiver/ storage tank requires refrigerant system service. How long must an HVAC servicing company keep records for each disposed appliance with a charge between 5 and 50 lbs? Recovering refrigerant in vapor phase will leave the oil in the system, minimizing oil loss. c. 30 psig. A 20 -cm-square vertical plate is heated to a temperature of 30C30^{\circ} \mathrm{C}30C and submerged in glycerin at 10C10^{\circ} \mathrm{C}10C. a. a. Starting in 2019, what leak rate triggers the EPA requirement that commercial refrigeration systems containing 50 pounds or more of R-22 be repaired? When can appliances containing refrigerants be recovered to atmospheric pressure? It is best practice to use dry nitrogen to break the vacuum when dehydrating by the triple evacuation method. 0 times. Recovered refrigerant may contain which of the following impurities? b. b. Cooling the recovery cylinder to lower its pressure. ESFC Investment Group offers financing and engineering design for LNG plants in Europe, USA, Latin America, Middle East and other regions of the world What action must an owner/operator take if a supermarket system containing 50 or more pounds of R-22 leaks more than 125% of its full charge in a calendar year? a. Replacement of an evaporator coil. Which leak rate category would this chiller be in? What is the primary water source for a water cooled recovery unit's condensing coil? c. 12 months c. When the discharge service valve is open. The recovered refrigerant may have contained impurities of acids, moisture, and oil. a. May 2016. The usual refrigeration process comprises the compressors input of work and exploits the vapor density cycle. What is the result of raising the temperature of the room in which a low pressure chiller is located? Shut down the appliance temporarily. Which of the following statements about recovering and recycling equipment is false? Unit test c example. When can appliances containing refrigerants be recovered to atmosperic pressure? When is it against EPA regulations to use system-dependent recovery equipment? We weren't able to detect the audio language on your flashcards. c. the cylinder should be heated. Purchases of such equipment must be reported to the EPA. Match the term with the following definitions. b. Which refrigerant(s) must be recovered before opening or disposing of appliances? Establish laws that contain stricter requirements. You are changing out a compressor of a system containing 40 pounds of R-404A. A new filter drier has been installed. Every 3 months What can be used to pressurize a chiller system before opening the system for a non-major repair? mikeyfresh. Which of the following is a reason to take an oil sample? c. Compressor d. Liquid charge through the liquid-line service valve. Before making a major repair, technicians must evacuate an appliance or component containing more than 200 pounds of R-410A to which of the following levels? d. Introduce an initial charge of refrigerant and start the compressor. Recovered refrigerant may contain which of the following? Change the recovery cylinder on the recovery machine. How long must owners and operators of regulated appliances normally containing 50 or more pounds of HCFC refrigerant keep records of leak inspections, initial leak verification and follow-up verification tests? It is best practice to use dry nitrogen to break the vacuum when dehydrating by the triple evacuation method. 80 percent of the refrigerant in the small appliance when the compressor is not functional. b. requires a minimum of 10 psig What is the first thing to do when a new system has been assembled (built up), and is ready for testing? c. must be reclaimed. Identify the best method to charge a system that has both an air-cooled condenser and evaporator with a nameplate charge of 80 pounds. Find out how you can intelligently organize your Flashcards. d. Ice making refrigeration, A customer has an industrial process refrigeration system that has 1000lbs of R-22 that has exceeded the applicable leak rate threshold. How can you speed up the removal of the refrigerant charge from a system? c. It must be equipped with low-loss fittings. Which theory is best supported by a Doppler shift of spectral lines toward the red end of the spectrum? Submit a report to EPA describing efforts to identify leaks and repair the appliance. d. 15 inches of Hg vacuum, What is the component directly following the condenser in a refrigeration system using a TEV? - ANSWER Cooling the recovery cylinder to lower its pressure. 3 years Which element of a CFC or HCFC molecule cases ozone depletion? - ANSWER Acids, Moisture, and Oil What area . d. When the evaporator has a small leak. Repair the appliance so that it leaks below the threshold and conduct the initial verification test. When under a deep vacuum the motor windings of a hermetic refrigeration compressor; Cooling the recovery cylinder to lower its pressure. The drop 10 workout in 2 weeks results. For what refrigerant is an equipment room Refrigeration monitor required under ASHRAE standard 15? Wait for at least a few minutes to see if the system pressure rises. For what refrigerant is an equipment room refrigerant detector not required under ASHRAE Standard 15 provided the mechanical ventilation system in the machinery is run continuously? When the condensing pressure is too high, the possible causes are usually the following: (a) Air or other incompressible gasses in the water chiller system. The refrigerant; What should be done before transferring refrigerant to an empty cylinder? b. R-22 and leak checked. Purchases of such equipment must be reported to the EPA. Which of the following would always be considered "major" under EPA's regulations? After system servicing and recharging, why is refrigerant vapor re-introduced to the chiller before refrigerant liquid? c. Water in the system can freeze. What is the evaporation temperature of R-134a at 0 psig? When is it against EPA regulations to use system-dependant recovery equipment? Checking for moisture in the refrigerant. b. Which of the following refrigerants would be used in a low-pressure appliance? What must be done before recovery? d. De-ionized water. How long must an HVAC servicing company keep records for each disposed appliance with a charge between 5 and 50 lbs? What should be done after reaching the required recovery vacuum on an appliance? b. c. Using a two-stage vacuum pump There are two acceptable procedures for recovering refrigerant contained in oil: Evacuate (or pressurize) the refrigeration appliance, or isolated portion, to a pressure no greater than 5 psig and then remove the oil; or Drain the oil into a system receiver to be evacuated (or pressurized) to a pressure no greater than 5 psig. d. Equipment designed to recover flammable refrigerant must meet a specific UL safety standard. Industrial process refrigeration 10% Purge units that discharge a low percentage of refrigerant with the air they remove. What should systems that use R-407C be leak checked with? The unit has had a leak or a major component failure. a. Recovered refrigerant can either be recycled on-site using approved equipment designed to both recover and recycle refrigerant, or sent off-site to a reclamation facility to be purified according to ARI Standard 700. Pressurize with an inert gas and leak check. What CANNOT be done to service the appliance? What can happen when using a large vacuum pump to evacuate a system? Evacuate the isolated section of the system to 0 psig and if system pressure does not rise after a few minutes, remove the compressor. b. Which of the following CANNOT be used as a reason to extend the appliance repair deadlines? b. R-22 Refrigeration removal from a low-pressure system starts with: Under what code group of standard 34 does R-123 fall? These standards are based on the Air-Conditioning, Heating, and Refrigeration Institute (AHRI) 740 test protocol. Gas dampers which have not been punctured represent an explosion risk, as the material they are made of may be weakened or damaged. During evacuation with large amounts of moisture, it may be necessary to increase pressure to counteract freeing with gas such as; For what refrigerant is an equipment room refrigerant detector NOT required under ASHRAE Standard 15 provided the mechanical ventilation system in the machinery is running continuously? a. the compressor should be valved off. What is meant by the term "high efficiency purge unit". b. d. Heating the recovery cylinder to raise its pressure. Following a retrofit. A comfort-cooling appliance containing 50 pounds or more of R-22 is found to be leaking beyond the applicable leak rate threshold. How would you remove the moisture from refrigerant in a system? Where must you connect a hose in order to recover liquid refrigerant? a. In addition to isolating the compressor, which of the following procedures should you follow? Prior to replacing the condenser coil in a high pressure system the refrigerant was recovered and stored in a refillable cylinder the refrigerant. Sodium chloride, potassium nitrate, and silicone oil c. Sulphur dioxide and methane d. Acids, moisture, and oil D What is the first thing to do when a new system has been assembled and is ready for testing? Reglas de divisibilidad del 2 3 5. What should be done before transferring refrigerant to an empty cylinder? d. horizontally. Biomass gasification is one of the most promising routes to produce green hydrogen, power, fuels, and chemicals, which has drawn much attention as the world moves away from fossil fuels. The refrigerant should be mixed. Where does refrigerant go to after it leaves the purge unit of a low-pressure centrifugal system? Where is the purge unit located in a low-pressure system? A loop that is inside another is called a(n) _________ loop. Commercial refrigeration c. Compressor port Cooling the recovery cylinder to lower its pressure. Look at the unit nameplate. b. Excessive superheat / Traces of oil are an indication of a refrigerant leak, Which of the following is an indicator of a leak in a high-pressure system with a capillary tube, Minimize refrigerant release when hoses are connected and disconnected, Why do gauge set hoses used for field service work have self-sealing connectors or hand valves. Modern VC refrigerant like HFC - also known as f-gases (fluorinated greenhouse gases) - has no ozone depleting property but has high global warming potential. What should be done after reaching the required recovery vacuum on an appliance? Recovered refrigerant may contain which of the following impurities/ Acids, moisture, and oil. Compressor What is a deep vacuum usually measured in? How long must a HVAC servicing company keep records for each disposed appliance with a charge between 5 and 50 pounds? a. 1 month Teradata secondary index example. Take further action by repairing, retiring, mothballing, or retrofitting the appliance. -21F To prevent refrigerant vaporization. Which of the following is an indicator of a leak in a high pressure system with a capillary tube? It could contain acids, liquids, or byproducts of engine combustion like water or particulates. A company uses a chiller that divers 55% of its cooling capacity to one of its manufacturing lines and 45% of its cooling capacity to air condition the office spaces. Refrigerant cannot be recovered without isolating a parallel compressor system because of. c. refrigerant should be pumped down and isolated in the receiver. For what refrigerant is an equipment room refrigerant detector NOT required under ASHRAE Standard 15 provided the mechanical ventilation system in the machinery room is run continuously? Refrigerant recovery from a system using R-11 or R-123 starts with. Which of the following refrigerants would be used in a low-pressure appliance? Which of the following CANNOT be used as a reason to extend the appliance repair deadlines? The EPA has determined that the fundamental changes to the remedy described in this ROD amendment comply with the statutory requirements of CERCLA 121, 42 Ammonia is typically removed through a nitrification process. Service valve positions and recovery oil level should be checked, when applicable. Wisconsin law prohibits the release of regulated refrigerants into the atmosphere. When the condenser is below the receiver. b. Which of the following is a reason to take an oil sample? Composed of stratified squamous epithelium? When first inspecting a hermetic system known to be leaking, you should look for; After a leak repair of a supermarket rack using 3000 lbs. However, it; Pressure relief valves can only be installed; What is the first thing to do when a new system has been assembled (built up), and is ready for testing, pressurize with an inert gas and leak check. Which of the following is a reason to take an oil sample? (c) Too much charge in the refrigeration system (liquid recovery in the condenser). What are the characteristics of hydrofluoroolefins (HFO's). Currently, the most common method of CO2 control in RAS is through the use of aerated packed Research thisrule and list 5 of the requirements. c. The recovery unit oil should be changed and the recovery cylinder evacuated. Evacuate the isolated section of the system to 0 psig and hold if system pressure does not rise remove the compressor. The most common way to detect the leak is to look under the car, and if there is the presence of puddle or liquid beneath the car. 6 months Where should the discharge from a rupture disc be piped for venting? Isolated in the appliance. What is the primary water source for a water-cooled recovery unit's condensing coil? Release A discharge of a hazardous material or other contaminant into the environment. A comfort-cooling appliance containing 50 pounds or more of R-22 is found to be leaking beyond the applicable leak rate threshold. - ANSWER 3 years (Both answers) Recovered refrigerant may contain which of the following impurities? When installing more than one pressure relief valves must be installed; After all the liquid has been removed from an average 350 ton approximately how much vapor refrigerant remains in the system. b. 87 psig When is against EPA regulations to use system dependant recovery equipment? b. b. Thermostat Any available HCFC. Regenerate (reclaim). What are refrigeration and compressor heaters used for? What would be the next step(s)? What steps should be taken before using a recovery unit to remove a charge? Every refrigerating system mst be protected by which of the following? d. Evaporator. b. Both organizations can provide information on certified equipment. cooling the recovery cylinder to lower its pressure, Refrigerant has been recovered from an air conditioning system and held in a refillable cylinder in order to replace the condenser coil the refrigerant. What must be done before recovery? What must an owner of a commercial refrigeration appliance with a charge of 2000 pounds of r-22 do once the leak rate threshold has been exceeded? c. 1000 microns liquid removal and is followed by vapor recovery. a. b. NATE Industry Competency Exam: Commercial, 6. 0. The repair is followed by an evacuation of the appliance to the environment. The vehicle may be weakened, which can have a negative affect on lifting points. REFRIGERANT RECOVERY PROGRAM. The motor relies on the flow of refrigerant through the compressor for cooling. A 0.400-kg object undergoing SHM has ax=1.80m/s2a_{x}=-1.80 m / s^{2}ax=1.80m/s2 when x = 0.300 m. What is the time for one oscillation? When recovery is first started, at what phase is the refrigerant removed to save recovery time? c. Air b. Acids moisture & oils (all of the above ) . Nitrogen with a trace amount of the systems design refrigerant. Which of the following statements about recovery equipment is FALSE? a. water Recovering refrigerant from a system in the vapor phase will minimize the loss of which of the following? What is a deep vacuum usually measured in? d. 260 psig, What is the component directly following the condenser in a system using a thermal expansion valve? pressurize the system by the use of controlled hot water or heater blankets. b. a. c. 90 psig Remove the appliance and store it in a warehouse at the facility. 1 mm Hg. c. Retire the appliance until it can be replaced with a new one. b. oil A chiller containing 150 pounds of HCFC refrigerant is leaking above the leak rate threshold. What is the primary water source for a water cooled recovery unit condensing coil? a. Whole Home Evaporative Cooling This refrigerant needs to be monitored and refilled periodically in order for the unit to work. Every month Remove the appliance and store it in a warehouse at the facility, The motor relies on the flow of refrigerant through the compressor for cooling.

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