b. What is the easiest way to check the type of refrigerant used in a 60 ton packaged rooftop unit? -15F Warming the liquid refrigerant in the system. To find refrigerant leaks in coil fin area. a. Psig What is the first thing to do when a new system has been assembled and is ready for testing? 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. Approved refrigerant recovery cylinders can be identified by which color code? Which of the following is a reason to take an oil sample? c. refrigerant should be pumped down and isolated in the receiver. b. -21F can probably be charged back into the system. b. EPA regulations (40 CFR Part 82, Subpart F) under Section 608 of the Clean Air Act require that refrigerant recovery and recycling equipment be tested to ensure it meets EPA requirements.For most recovery and recycling equipment, these requirements are detailed in Appendix B2 to 40 CFR 82, Subpart F. Requirements for equipment manufactured or imported after January 1, 2017, are detailed in . d. When the appliance is leaking. b. Microns What is the primary water source for a water cooled recovery unit condensing coil? When should an appliance NOT be evacuated all the way to the prescribed level? When is it against EPA regulations to use system-dependant recovery equipment? 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. of R-22 and a successful initial verification test, when must a follow-up leak verification test be conducted? Can be dangerous if not used with a pressure regulator. (c) Too much charge in the refrigeration system (liquid recovery in the condenser). What is the state of the refrigerant leaving the receiver in a refrigeration system? 32 psig c. is toxic when released into the atmosphere How many ozone molecules can each chlorine atom in the stratosphere destroy? a. by AlisiaScheurer, a. Non-scratching abrasive pad Low pressure liquid 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". 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. c. 90 psig Recovered refrigerant Why should you never use an open flame to heat a refrigerant tank? Gas dampers which have not been punctured represent an explosion risk, as the material they are made of may be weakened or damaged. a. Unless granted additional time, how many days do you have to repair the leak and conduct the initial leak verification? c. High pressure liquid Whole Home Evaporative Cooling This refrigerant needs to be monitored and refilled periodically in order for the unit to work. When dehydrating a system it should be evacuated to a level of; Refrigerant should be removed from the condenser outlet if the condenser is; What happens to a refrigerant that is above the saturation temperature? Purchases of such equipment must be reported to the EPA. The refrigeration chemicals inside the equipment must be properly recovered using approved . Use of calculations based on compressor horsepower. 143 psig A lock (LockA locked padlock) or https:// means youve safely connected to the .gov website. a. Purged to the atmosphere. An initial leak verification test failed after repairing a leak in a rack refrigeration system for a supermarket using an HCFC refrigerant. This requirement was a new demand on an industry that, until then, had largely operated unregulated, and there was no program, infrastructure, facility or Establish laws that contain stricter requirements. When is it against EPA regulations to use system-dependent recovery equipment? Refrigerant cannot be recovered without isolating a parallel compressor system because of: Which of the following refrigerants would be used in a low-pressure appliance? 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].". What is the state of the refrigerant leaving the receiver in a refrigeration system? 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? (d) The condensing pressure control is set to too high a pressure. a. the service valve connection. b. in parallel. Industrial process refrigeration Where must you connect a hose in order to recover liquid refrigerant? After a leak repair of a supermarket rack using 3000 lbs. Keep the following in mind: Where must you connect a hose in order to recover liquid refrigerant? What is the leak rate threshold for industrial process refrigeration? How would you remove moisture from refrigerant in a system? Acids moisture & oils (all of the above ) . Reusing recovered refrigerant in the same system or another system is not recommended if it . However, it; Every refrigerating system must be protected by which of the following? Your recovery recycling machine has r502 refrigerant in it you now have to recover refrigerant from a unit with R22 what must be done before the R-22 refrigerant can be recovered recycled? 0. 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. After initially accelerating upward, it rises at a constant velocity. b. Why do gauge set hoses used for field service work have self sealing connectors or hand valves? It could contain acids, liquids, or byproducts of engine combustion like water or particulates. Find out how you can intelligently organize your Flashcards. 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. When leaks in the appliance make evacuation to the prescribed level unattainable. Liquids should be recovered last C. Refrigerant should be recovered in the receiver D. A gauge pressure should be achieved by venting 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? Check to see if it has leaked above the mandatory retirement threshold. b. Leaks in the appliance make recovery to the prescribed level unattainable. a. Ammonia, carbon dioxide, and methyl chloride b. Which condition requires accessing both the high and low side of the . d. Ice making refrigeration. c. 1000 microns Add to folder For major repairs such as replacing the compressor, condenser, or evaporator. d. To prevent acid pitting. 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. What is a deep vacuum usually measured in? Save. Introducing Cram Folders! A chiller for comfort cooling that contains 50 pounds or more of R-123 is leaking. When a trace gas becomes absolutely necessary, which of the available refrigerants should be used to help locate a leak? Change the recovery cylinder on the recovery machine. When servicing the unit;. Refrigerant should be pumped down to and isolated in the receiver. 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? 6 months c. Water in the system can freeze. b. 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 is true of recycling and recovery equipment? 10 psig. A new filter drier has been installed. b. the electrical connections. a. How long must an HVAC service company keep records for each disposed appliance with a charge between 5 and 50 pounds? Other. a. Purchase of such equipment must be reported to the EPA. REFRIGERANT RECOVERY PROGRAM. b. Your recovery recycling machine has R22 refrigerant in it you now have to recover refrigerant from a unit with R-410A what must be done before your recovery unit can be used to recover R- 410A? Which of the following repairs would always be considered "major" under EPA's regulations? When propane (R-290) is used as refrigerant, it must meet the purity standards set for HVACR equipment. Recovering refrigerant from a system in the vapor phase will minimize the loss of which of the following? When the suction service valve is closed. Higher suction pressure What steps should be taken before using a recovery unit to remove a charge? Indicate the values of IDI_{\mathrm{D}}ID, VGSV_{\mathrm{GS}}VGS, and VDSV_{\mathrm{DS}}VDS. This refrigerant needs to be monitored and refilled periodically in order for the unit to work. c. When the compressor is inoperative. What steps should be taken before using a recovery unit to remove a charge? Your recovery/recycling machine has R-22 in it. d. Higher discharge pressure, During evacuation with large amounts of moisture it may be necessary to increase pressure to counteract freezing with a gas such as' Oracle database architect job description. c. 219 psig c. Replacement of a Schrader valve core. 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; Lower suction pressure Pull a vacuum. Recovered refrigerant may contain which of the following impurities? a. - ANSWER Cooling the recovery cylinder to lower its pressure. 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. b. To pinpoint refrigerant leaks. 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. 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? 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? 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. Propane purchased for grilling contains impurities which will damage refrigeration equipment. c. 15% Acids, Moisture, Oils When can appliances containing refrigerants be recovered to atmospheric pressure? Recovered refrigerant may contain which of the following? Cooling the recovery cylinder to lower its pressure. In addition to isolating the compressor, which of the following procedures should you follow? b. An oil sample should be taken for which of the following reasons? a. Which of the following always falls under the EPA definition for "major maintenance, service, or repair"? For most recovery and recycling equipment, these requirements are detailed in Appendix B2 to 40 CFR 82, Subpart F. Requirements for equipment manufactured or imported after January 1, 2017, are detailed in Appendix B3 (for non-flammable refrigerants) or Appendix B4 (for flammable refrigerants). 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. c. File a report to EPA describing their efforts to repair the appliance. 1 mm Hg. c. an open equalization connection. If you are looking for a product that can help make your life simple, you have come to the right place. Which element of a CFC or HCFC molecule causes ozone depletion? a. in series. a. often contains moisture. When the discharge service valve is closed. 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recovered refrigerant may contain which of the following impurities