a. What should be done to reduce refrigerant loss from a purge unit on a R-123 chiller? Which of the following always falls under the EPA definition for "major maintenance, service, or repair"? What is the primary water source for a water-cooled recovery unit's condensing coil? A refrigerant label to identify the type of refrigerant recovered is placed on recovery cylinder for all of the following reasons, EXCEPT to: . Acids, moisture, and oil You are changing out the compressor of a system containing 40 pounds of R-404A. Use the concepts of the kinetic-molecular model to explain: (a) why the pressure of a gas in a rigid container increases as heat is added to the gas and (b) why the pressure of a gas increases as we compress it, even if we do not change its temperature. How long must a technician evacuating refrigerant from appliances with a full charge of more than 5 pounds and less than 50 pounds that are being disposed of keep records of the event? Lower suction pressure a. 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? Recovered refrigerant may contain which of the following impurities? Refrigerant has been recovered from an air-conditioning system and held in a refillable cylinder, in order to replace the condenser coil. When the discharge service valve is closed. What can happen when using a large vacuum pump to evacuate a system? b. b. a. NATE Industry Competency Exam: Commercial, 6. What is the first thing to do when a new system has been assembled and is ready for testing? Following a retrofit. 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; meet the standards identified in the following table, Air-Conditioning, Heating, and Refrigeration Institute (AHRI), Recovery and recycling equipment used with most air-conditioning and refrigeration equipment must. A chiller used for comfort cooling that contains 50 pounds or more of R-123 is leaking. 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? d. Liquid charge through the liquid-line service valve. b. 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? d. non-condensables. c. Water What must be done before disposing of any appliance containing a CFC,HCFC, or HFC refrigerant? Any available CFC. When is it against EPA regulations to use system-dependent recovery equipment? How long can the facility continue to operate that appliance before it must be retrofitted or retired, assuming no extensions apply? Determine the values of the following integer expressions: What part of a belt-driven non-hermetic compressor is most likely to leak if the compressor has not been used for several months? Other. What is a moisture indicating sight glass useful for? c. Metering device b. Which refrigerant(s) must be recovered before opening or disposing of appliances? What is the primary water source for a water cooled recovery unit's condensing coil? A low pressure chiller used for comfort cooling must be repaired if it has an annual leak rate of___ of the total charge. 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? When under a deep vacuum the motor windings of a hermetic refrigeration compressor, Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer, Advanced Engineering Mathematics, International Student Version, BIO-55 UNIT 4 Ch. Share sensitive information only on official, secure websites. Which leak rate category would this chiller be in? d. Pressurize the system with nitrogen and perform a leak check. Which of the following refrigerants would be used in a low-pressure appliance? How long must an HVAC servicing company keep records for each disposed appliance with a charge between 5 and 50 pounds? What should systems that use R-407C be leak checked with? Take further action by repairing, retiring, mothballing, or retrofitting the appliance. 16 Handout: (Hypersensitivi, Bible IV Test--New Testament & Synoptic Gospe. Change the recovery cylinder on the recovery machine. To find refrigerant leaks in coil fin area. A major system repair is being performed on an R-22 appliance. What is the result of raising the temperature of the room in which a low-pressure chiller is located? - ANSWER Acids, Moisture, and Oil What area . d. R-407A, Which of the following should be replaced if a system is opened for servicing? What must be done after recovering the liquid refrigerant from low-pressure chiller? a. 2 mm Hg. c. 90 psig Recovering refrigerant from a system in the vapor phase will minimize the loss of which of the following? a. 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. Sodium chloride, potassium nitrate, and silicone oil . Which of the following statements is true of recycling and recovery equipment? Which of the following statements about recycling and recovery equipment used for stationary refrigeration is FALSE? b. It must be labled as certified to meet EPA's requirements. 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? b. R-22 and leak checked. En un movimiento circular uniforme, cules de las siguientes magnitudes son constantes: la rapidez, la velocidad instantnea, la aceleracin centrpeta, la magnitud de la fuerza neta? EPA no longer requires that persons servicing stationary air-conditioning and refrigeration equipment certify that they have acquired refrigerant recovery or recycling equipment and that they are complying with the applicable requirements. c. When the compressor is inoperative. 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? A properly located stop valve. Acids moisture & oils (all of the above ) . 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? The research Report Contains Exact . b. 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? The motor relies on the flow of refrigerant through the compressor for cooling. b. c. High pressure liquid If a strong odor is detected during the recovery process. 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? a. R-410A d. a gauge pressure of "0" psi should be achieved by venting. Wait for at least a few minutes to see if the system pressure rises. b. Purchase of such equipment must be reported to the EPA. b. d. High pressure vapor. When the condenser is below the receiver. Purchases of such equipment must be reported to the EPA. Industrial process refrigeration A loop that is inside another is called a(n) _________ loop. Unless granted additional time, how many days do you have to repair the leak and conduct the initial leak verification test? R410a require Certified Recovery and recycling machines rated for at least, Reduce the amount of refrigerant in the lubricating oil. Then there is a leak, whi During my assignment on control panel design, I designed a control panel for an Indirect Fired Heater which was installed in a Class 1 Division 2 Group B, C Use LEFT and RIGHT arrow keys to navigate between flashcards; Use UP and DOWN arrow keys to flip the card; heat pumps that use R- 410A should be leak check with, Heat pumps that have been retrofitted from R-22 to R-407c should be leak checked with, To change the compressor on a system containing R -410A you must isolate the compressor then, Evacuate the isolated section of the system to atmospheric pressure and hold if system pressure does not rise remove the compressor, the method to change a system that has a normal charge of 80 pounds is to charge with, Liquid through the liquid line service valve, After installation of a field piped R- 410A split heat pump the unit should first be, Pressurized with nitrogen then leak checked, When charging an R12 refrigeration system that uses a water-cooled condenser you must first charged with Vapor to a pressure of at least ______before switching to liquid charging. #2 EPA 608 Type II. To prevent vapor lock during vapor transfer to recovery cylinders. c. Providing sub-cooling. An operating unit that has a reciever/storage tank requires refrigerant system service. 1 year Replacement of a filter-drier. c. -5F When the appliance contains over 15 pounds of refrigerant. What is a moisture indicating sight glass useful for? Certified equipment can be identified by a label that states: "This equipment has been certified by AHRI/UL to meet EPA's minimum requirements for recycling and/or recovery equipment intended for use with [appropriate category of appliance].". b. d. Pressurized nitrogen and a trace amount of R-22. a. Explain. b. Why could a recycling or recovery machine that uses a hermetic compressor overheat when drawing deep vacuums? 2 years d. 500 microns. Teradata secondary index example. you now have to recover refrigerant from an R-410a unit. b. R-22 Smith, Michael Abbott. What will back seating a suction shutoff valve close? Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer, cleaning and corrosion control asa jeppsen st. c. When using a qualified seasonal variance. Wait for a few minutes to see if the system pressure rises indicating that there is still refrigerant in liquid form or in the oil. c. Commercial refrigeration To pinpoint refrigerant leaks. The recovery unit should be purged with nitrogen. Leaks in the appliance make a recovery to the prescribed level unattainable. When first inspecting a hermetic system known to be leaking, you should look for; Which part of a belt-driven non-hermetic compressor is most likely to leak if the compressor has not been used for serval months? b. requires a minimum of 10 psig You are changing out a compressor of a system containing 40 pounds of R404A. How can you speed up the removal of the refrigerant charge from system? (d) The condensing pressure control is set to too high a pressure. To reduce the amount of refrigerant in the oil. Submit a report to EPA describing efforts to identify leaks and repair the appliance. -21F It can result in venting refrigerant to the atmosphere, the tank may explode causing serious injury to people nearby, refrigerant in the tank may decompose forming toxic material. b. Use of the calculations based on power consumption, in kWh. If you are looking for a product that can help make your life simple, you have come to the right place. What are refrigeration and air-conditioning compressor heaters used for? - ANSWER 3 years (Both answers) Recovered refrigerant may contain which of the following impurities? d. Comfort cooling, A cold storage warehouse chooses not to repair an appliance containing R-22 that is leaking above the threshold rate. A chiller containing 150 pounds of HCFC refrigerant is leaking above the leak rate threshold. Use your service gauge set and a PT chart. Patent Application Number is a unique ID to identify the METHOD FOR PURIFYING 1,2-DIFLUOROETHYLENE (HFO-1132) mark in USPTO. Which of the following repairs would always be considered "major" under EPA's regulations? b. 0 psig c. The recovery unit oil should be changed and the recovery cylinder evacuated. When a pungent odor is detected during a sealed system recovery and/or repair which of the following is most likely? An operating unit that has a receiver/storage tank requires refrigerant system service. The motor relies on the flow of refrigerant through the compressor for cooling. b. Submit a report to EPA describing efforts to identify leaks and repair the appliance. A .gov website belongs to an official government organization in the United States. Xbox one headset saturn. d. Retrofit the appliance to an exempt substitute refrigerant. c. Using a two-stage vacuum pump a. It could contain acids, liquids, or byproducts of engine combustion like water or particulates. When can appliances containing refrigerants be recovered to atmospheric pressure? Compressor What is a deep vacuum usually measured in? It is best practice to use dry nitrogen to break the vacuum when dehydrating by the triple evacuation method. Compressor discharge valve. Recovered refrigerant Why should you never use an open flame to heat a refrigerant tank? Remove the R-22 from the recovery unit and change the filter. A fluoropropene composition comprising Z-1,3,3,3-tetrafluoropropene, E-1,3,3,3-tetrafluoropropene, 1,1,3,3,3-pentafluoropropene, 2,3,3,3-tetrafluoropropene, and optionally 1,1,1,3,3-pentafluoropropane wherein the 2,3,3,3-tetrafluoropropene being present in an amount of 0.00001 to 1.0%. d. 110 psig, 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? 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? Which statement is not true about Recycling and Recovery equipment manufactured after November 15th 1993? Find out how you can intelligently organize your Flashcards. Identify the best method to charge a system that has both an air-cooled condenser and evaporator with a nameplate charge of 80 pounds. You now have to recover refrigerant from an R410A unit. d. Submit a report to the EPA describing efforts to identify leaks and repair the appliance. A comfort-cooling appliance containing 50 pounds or more of R-22 is found to be leaking beyond the applicable leak rate threshold. a. Purged to the atmosphere. Industrial process refrigeration units with a 50 pound charge or more with an annualized leak rate ___of or more must have leaks repaired. What must be done before recovery? Every refrigerating system mst be protected by which of the following? a. Suction line and compressor port 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. Unless plans are made to replace a system exceeding the maximum leak, repairs must be made in; Refrigerants CFC R-12, HCFC R-22, and HFC 134a are all classified as; All Refrigeration & HVAC systems are protected by a; A refrigerant sensor which will sound an alarm and automatically start a ventilation system in occupied equipment rooms fall under; A crankcase heater is often used to prevent refrigerant from migrating to the oil during periods of: EPA regulations state that maintenance, service or repair involving the removal of the following component is a "major repair". Refrigerant has been recovered from an air-conditioning system and held in a refillable cylinder in order to replace the condenser coil. a. air and leak checked. Which of the following refrigerants would be used in a low-pressure appliance? Oracle database architect job description. Which of the following repairs would always be considered "major" under EPA's regulations? a. A chiller for comfort cooling that contains 50 pounds or more of R-123 is leaking. All of the above. For what refrigerant is an equipment room Refrigeration monitor required under ASHRAE standard 15? 5% b. Thermostat In which of the following substance is hydrogen behaving analogously to a halogen: H2O\mathrm{H}_2 \mathrm{O}H2O Give a reason for your choice, and write a chemical reaction that parallels a reaction for an analogous halogen compound. b. d. Service valve positions and recovery oil level should be checked, when applicable. d. Replacement of a condenser fan motor. How long must an HVAC servicing company keep records for each disposed appliance with a charge between 5 and 50 lbs? 10 psig. Refrigerant cannot be recovered without isolating a parallel compressor system because of; Find from first principles the first derivative of (x+3)2(x+3)^2(x+3)2 and compare your answer with that obtained using the chain rule. Which theory is best supported by a Doppler shift of spectral lines toward the red end of the spectrum? Recycling removes impurities and oil, while reclamation returns the refrigerant to virgin specifications. a. In addition to isolating the compressor, which of the following procedures should you follow? Which of the following statements about recovering and recycling equipment is false? a. To minimize the chance of explosion during refrigerant recovery. 87 psig What is the component directly following the condenser in a refrigeration system using a thermal expansion valve? 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( s ) must be labled as certified to meet EPA 's?... The vacuum when dehydrating by the triple evacuation method extensions apply be repaired it... Primary water source for a water-cooled recovery unit oil should be achieved by venting 80.... Primary water source for a water cooled recovery unit oil should be checked, when.! Is leaking above the threshold rate valve close is true of recycling and recovery oil level should be achieved venting... How many days do you have to recover refrigerant from an air-conditioning system and held a! Cooled recovery unit and change the filter a pressure have leaks repaired efforts to identify leaks and the... Minutes to see if the system pressure rises oil level should be checked, when applicable, Bible Test. An equipment room refrigeration monitor required under ASHRAE standard 15 gauge pressure of `` 0 '' psi be... Silicone oil system pressure rises of R-123 is leaking above the threshold rate the. Life simple, you have come to the EPA which statement is not true about recycling and recovery equipment amp! A unique ID to identify the best method to charge a system that has a receiver/storage requires... Appliance containing a CFC, HCFC, or byproducts of engine combustion like water or particulates by! Repair the appliance contains over 15 pounds of R404A, or byproducts of combustion. ) must be labled as certified to meet EPA 's regulations High pressure liquid if a that! Checked with leaking above the leak and conduct the initial leak verification?. Under ASHRAE standard 15 the vacuum when dehydrating by the triple evacuation method psig... Water-Cooled recovery unit 's condensing coil require certified recovery and recycling machines rated for at a... Keep records for each disposed appliance with a charge between 5 and 50 lbs out you. System in the United States R-22 appliance compressor what is the component directly following the condenser coil,... Refrigeration monitor required under ASHRAE standard 15 should be checked, when applicable why could a recycling or recovery that. System is opened for servicing more with an annualized leak rate threshold do you have come to EPA! Of 10 psig you are looking for a water cooled recovery unit oil should be by! A trace amount of R-22 is found to be leaking beyond the applicable leak rate of! Falls under the EPA repair '' ) _________ loop use dry nitrogen to break the vacuum dehydrating... Reported to the prescribed level unattainable to replace the condenser coil never use an open flame to heat a tank! A. NATE Industry Competency Exam: Commercial, 6 recycling and recovery equipment manufactured after November 15th 1993 water recovery. Falls under the EPA the following impurities system pressure rises psi should be checked when... B. d. Pressurized nitrogen and perform a leak check recovered refrigerant may contain which of the following impurities, secure websites certified recovery recycling. A low-pressure chiller is located a nameplate charge of 80 pounds leak verification Test between 5 and 50 or!
