b. in parallel. Acids moisture & oils (all of the above ), The back seating of a suction shutoff valve will close the. Which of the following statements about recycling and recovery equipment is FALSE? Both organizations can provide information on certified equipment. To reduce the amount of refrigerant in the oil. After refrigerant liquid has been recovered from the appliance, any remaining vapor is; Which of the following statements about recycling and recovery equipment is FALSE? b. Uk grade scheme. Heat pumps drive heat from one or more heat sources (Q in) at low temperatures (T source) to one or more heat sinks (Q out) at high temperatures (T sink) with the assistance of an external energy source (electricity; W in).Heat pumps use low-boiling point refrigerants as transitional fluids to absorb heat and vaporize in an evaporator. c. pumped into appliance receiver. What would be the next step(s)? Oracle database architect job description. To prevent refrigerant vaporization. What steps may be taken to prevent air accumulation into an idle low-pressure refrigeration system? c. Break the vacuum with nitrogen and open the system for service. c. Comfort cooling c. R-410A a. The market is filled with different types of products that vary in features and specifications. Share sensitive information only on official, secure websites. After installation of a field piped split system, the unit should first be pressurized with; Which leak repair category does the EPA define as the refrigeration appliances used in the retail food and cold storage warehouse sectors? We weren't able to detect the audio language on your flashcards. Recycling The process of restoring recovered ODSs by the removal of oils, acids, water, and other impurities. b. Evacuate the isolated section of the system to atmospheric pressure, then remove the compressor. These systems operate below atmospheric pressure. How would you remove moisture from refrigerant in a system? 10% WHATIF?\text{\blue{WHAT IF? Purge units that discharge a low percentage of refrigerant with the air they remove. However, it; When should refrigerant be removed from the condenser outlet? Wash the vehicle before starting dismantling. Wait for at least a few minutes to see if the system pressure rises. Take further action by repairing, retiring, mothballing, or retrofitting the appliance. Which of the following is NOT required in order to mothball an appliance using an ozone-depleting refrigerant (thereby extending the leak repair deadline)? What is the primary water source for a water cooled recovery unit condensing coil? What is the best use for testing with soap bubbles? Recovered refrigerant may contain which of the following impurities/. Purchases of such equipment must be reported to the EPA. Immediately disconnect the recycling or recovery equipment and open the system for service. An initial leak verification test failed after repairing a leak in a rack refrigeration system for a supermarket using an HCFC refrigerant. 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? d. De-ionized water. c. Commercial refrigeration 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; When the appliance contains over 15 pounds of refrigerant. What must be done before recovery? You are changing out a compressor of a system containing 40 pounds of R404A. b. Recovered refrigerant may contain which of the following impurities? d. non-condensables. Remove the appliance and store it in a warehouse at the facility. d. Crankcase heater, What is the easiest way to check the type of refrigerant used in a 60-ton packaged rooftop unit? Which of the following would always be considered "major" under EPA's regulations? When is it against EPA regulations to use system-dependant recovery equipment? Cram has partnered with the National Tutoring Association, Carbon Dioxide In Recirculating Aquaculture Systems. What is the primary water source for a water-cooled recovery unit's condensing coil? Cooling the recovery cylinder to lower its pressure. Refrigerant recovery from a system using R-11 or R-123 starts with. 6 months Purchase of such equipment must be reported to the EPA. 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? d. Ice making refrigeration. Repair leaks within 30 days from the date the leak was discovered. c. Liquid line. Which of the following is NOT required to mothball an appliance (thereby extending the leak repair deadline)? Indicate the values of IDI_{\mathrm{D}}ID, VGSV_{\mathrm{GS}}VGS, and VDSV_{\mathrm{DS}}VDS. Non-ozone depleting, and have low global warming potentials. Heat pumps that use R134A should be leak checked with, On a high pressure system______ is an indicator of a possible leak, system dependent recovery equipment cannot be used with, Appliance contains over 15 pounds of refrigerant, which component is not part of the low side of the system, Refrigerant leaves the receiver of a system as a, The recovery of refrigerant from a system as a vapor only will minimize the loss of, audio not yet available for this language, {"cdnAssetsUrl":"","site_dot_caption":"Cram.com","premium_user":false,"premium_set":false,"payreferer":"clone_set","payreferer_set_title":"EPA Type II","payreferer_url":"\/flashcards\/copy\/epa-type-ii-7199013","isGuest":true,"ga_id":"UA-272909-1","facebook":{"clientId":"363499237066029","version":"v12.0","language":"en_US"}}. c. Compressor Pose foto keren di pinggir pantai. 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. R-717, It is best practice to use dry nitrogen to break the vacuum when dehydrating by the triple evacuation method. Nitrogen with a trace amount of the system's design refrigerant. 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? Trapped oil can freeze. What are refrigeration and compressor heaters used for? c. 236 psig Refrigerant has been recovered from an air-conditioning system and held in a refillable cylinder in order to replace the condenser coil. answer choices Ammonia, carbon dioxide, and methyl chloride Sodium chloride, potassium nitrate, and silicone oil Sulphur dioxide and methane Acids, moisture, and oil Question 8 30 seconds Q. Refrigerant cannot be recovered without isolating a parallel compressor system because of; 158 psig d. 15 inches of Hg vacuum, What is the component directly following the condenser in a refrigeration system using a TEV? d. Vapor phase. How long can the facility continue to operate that appliance before it must be retrofitted or retired, assuming no extensions apply? d. Remove the R-22 from the recovery unit and change the filter. c. When the appliance contains over 15 pounds of refrigerant. Change the expansion valve on the recovery machine. What would be the next step(s)? What should be done before transferring refrigerant to an empty cylinder? b. Which theory is best supported by a Doppler shift of spectral lines toward the red end of the spectrum? Which type of refrigerant typically has the lowest global warming potential? Wisconsin law prohibits the release of regulated refrigerants into the atmosphere. b. c. Use of calculations based on component and pipe sizes. When can appliances containing refrigerants be recovered to atmospheric pressure? c. Accumulator Compressor Which of the following is a reason to take an oil sample? Industrial process refrigeration Recover the refrigerant and leak check the appliance with a trace gas. Commercial refrigeration a. When can appliances containing refrigerants be recovered to atmospheric pressure? a. After refrigerant liquid has been removed from a system any remaining vapor is, In a refrigeration system with a TXV or other type of throttling device the component directly following the condenser is the. a. b. Gas dampers which have not been punctured represent an explosion risk, as the material they are made of may be weakened or damaged. 25 mm HG absolute d. Torch, What is the approximate refrigerant pressure in an R-134a refrigerator, when it has been off for along time and the room temperature has been maintained at 80F? To reduce the amount of refrigerant in the oil. What can be used to pressurize a chiller system before opening the system for a non-major repair? What synthetic lubricant is presently used with ternary blends containing HCFC's? When the condenser is on the roof. In which component of a system does the refrigerant change from a high-pressure vapor to a high-pressure liquid? 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. Small appliance recovery equipment must be able to recover either: 90 percent of the refrigerant in the small appliance when the small appliance compressor is functional, or. When is it against EPA regulations to use system-dependent recovery equipment? How long must an HVAC servicing company keep records for each disposed appliance with a charge between 5 and 50 lbs? c. Water in the system can freeze. Pressure relief valves can only be installed: EPA regulations require that leaking industrial process refrigeration be repaired(or retrofitted or retired) when the leak rate exceeds; Where is the rupture disk located on a centrifugal chiller? To minimize the chance of explosion during refrigerant recovery. ASRAE Standard 15-2013 requires that the use of room sensors and alarms to detect: When leak testing a low-pressure chiller, the maximum pressure to use is; What type of equipment can be worked on with Type III certification? b. A lock (LockA locked padlock) or https:// means youve safely connected to the .gov website. Low pressure liquid c. Pressurized nitrogen and a trace amount of R-407C. The motor relies on the flow of refrigerant through the compressor for cooling. a. R-134a An official website of the United States government. When could a reciprocating compressor be damaged if energized? Which of the following CANNOT be used as a reason to extend the appliance repair deadlines? What is the state of the refrigerant leaving the receiver in a refrigeration system? You now have to recover refrigerant from an R410A unit. Which of the following refrigerants would be used in a low-pressure appliance? A comfort-cooling appliance containing 50 pounds or more of R-22 is found to be leaking beyond the applicable leak rate threshold. c. R-410A and leak checked. Checking for moisture in the refrigerant. This refrigerant needs to be monitored and refilled periodically in order for the unit to work. A pressure relief device. A chiller for comfort cooling that contains 50 pounds or more of R-123 is leaking. 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. Acids, Moisture, and Oil What area of a refrigeration system does oil foaming usually occur? can probably be charged back into the system. b. answer choices Ammonia, carbon dioxide, and methyl chloride Sodium chloride, potassium nitrate, and silicone oil Sulphur dioxide and methane Acids, moisture, and oil Question 14 30 seconds Q. Propane cylinders for grilling contain impurities that can damage refrigeration Identify the best method to charge a system that has both an air-cooled condenser and evaporator with a nameplate charge of 80 pounds. The refrigerant; What should be done before transferring refrigerant to an empty cylinder. 9 months 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? b. Take further action by repairing, retiring, mothballing, or retrofitting the appliance. After a leak repair of a supermarket rack using 3000 lbs of R-22 and a successful initial verification test when must a follow-up leak verification test be conducted? Purchases of such equipment must be reported to the EPA. Please click here to see any active alerts. c. A low pressure control. The research Report Contains Exact . d. Introduce an initial charge of refrigerant and start the compressor. c. Leaks in the appliance make recovery to the prescribed level unattainable. What will non-condensables in a refrigerant system result in? d. Use of the calculations based on the BTU capacity of the system. To pinpoint refrigerant leaks. A chiller containing 150 pounds of HCFC refrigerant is leaking above the leak rate threshold. After refrigerant liquid has been recovered from the appliance, any remaining vapor is; B. isolated in the appliance. Where would you place a leak detector probe to check gas leaks into the water box with water removed? During the installation of a new appliance. d. The oils used in hermetic compressors are a lower viscosity than the oils used in other equipment. b. requires a minimum of 10 psig What should be done to reduce refrigerant loss from a purge unit on a R-123 chiller? EPA regulations require that all appliances containing more than 50 pounds of refrigerant ,except for commercial and industrial process refrigeration, be repaired when the . Pull a vacuum. You now have to recover refrigerant from an R-410A unit. How long must an HVAC servicing company keep records for each disposed appliance with a charge between 5 and 50 lbs? a. d. When the evaporator has a small leak. An operating unit that has a receiver/storage tank requires refrigerant system service. Using a smaller recovery vessel. Why do gauge set hoses used for field service work have self-sealing connectors or hand valves? a. often contains moisture. The release of regulated refrigerants generally occurs as refrigeration and air-conditioning equipment is salvaged or dismantled for disposal. a. Retrofit the appliance with a substitute refrigerant b. Which of the following statements is true of recycling and recovery equipment? a. When recovering a different refrigerant type than the last refrigerant recovered using that specific recovery equipment, remove any refrigerant remaining in the recovery unit and change the unit ' s filter. a. 63 psig What is the term used to describe the fact that a refrigerant blend has a range of bubble or dew points at a constant pressure? a. in series. In addition to isolating the compressor, which of the following procedures should you follow? 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Replacing the condenser coil the type of refrigerant in the appliance and store it in a refrigeration... A minimum of 10 psig what should be recovered refrigerant may contain which of the following impurities before transferring refrigerant to an empty?... In addition to isolating the compressor result in air-conditioning system and held in a system starts.... Out a compressor of a system using R-11 or R-123 starts with weakened or damaged taken prevent! You are changing out a compressor of a suction shutoff valve will close the ternary containing... To be monitored and refilled periodically in order for the unit to work area of refrigeration... Have to recover refrigerant from an air-conditioning system and held in a high pressure system the refrigerant leak. A. R-134a an official website of the refrigerant leaving the receiver in high... Isolated section of the following impurities/ of R-22 is found to be monitored and refilled periodically in order for unit.