When leaks in the appliance make evacuation to the prescribed level unattainable. What should be done before transferring refrigerant to an empty cylinder? The cylinder should be evacuated to avoid mixing air with the recovered refrigerant.Moreover, when should the refrigerant be removed from the condenser outlet?
Cards
| Term Type II Technician | Definition Technicians maintaining, servicing, repairing or disposing of high pressure or very high-pressure appliances. |
| Term Refrigerant should be removed from the condenser outlet if the condenser is; | Definition below the reciever |
Subsequently, question is, what will non condensables in a refrigeration system result in? Non-condensable in the system will result in high head pressure / condensing temperature and occasionally high side pressure fluctuations as well as decreased cooling capacity and efficiency due to higher compression ratios.
Thereof, where must you connect a hose in order to recover liquid refrigerant?
TYPE II
| Question | Answer |
| 6. When recovery is first started, at what phase is the refrigerant removed to save recovery time, | C. Liquid phase |
| 7. Where must you connect the hose in order to recover liquid refrigerant, | C. Liquid line |
What is the state of refrigerant leaving the receiver in a refrigeration system?
A common question asked when discussing receivers is, “How can the refrigerant leave the receiver in a subcooled state?” That answer is because in the receiver, there is both liquid and vapor refrigerant. By definition, that refers to a saturated refrigerant.
What steps should be taken before using a recovery unit to remove charge?
Before using a recovery unit to remove a charge, what steps should be taken? a) Check service valve. b) Check the oil level in the recovery unit. c) Evacuate recovery unit and recovery tank.How would you remove moisture from refrigerant in a system?
Moisture can be removed from a refrigeration system by applying a vacuum. POEs hold moisture more tightly than mineral oil. But in the case of R-134a, the refrigerant effectively competes with the ester lubricant in partitioning the water (i.e., the water moves from the lubricant to the refrigerant).What level of vacuum should be pulled when evacuating a vapor compression system to assure all moisture has been removed?
25 Cards in this Set
| Which of the following should be replaced if a system is opened for servicing? | Filter drier |
| What level of vacuum should be pulled when evacuating a vapor compression system to assure all moisture has been removed? | 500 microns |
What gas should be used to leak check a system designed for use with r410a?
77 Cards in this Set
| heat pumps that use R- 410A should be leak check with | pressurized nitrogen |
| While r410a is a high pressure refrigerant it can be stored in the back of your service van as long as | The temperature inside the vehicle does not exceed 125F this is the same guidance given for R22 and other common refrigerant |
What refrigerant can be used as a trace gas?
Before nitrogen is added, the system must be recovered and then evacuated to appropriate levels. Otherwise, the HCFC, or HFC refrigerant trace gas vented along with the nitrogen will be considered a refrigerant.What is the proper charging method for blended refrigerants?
Refrigerant charging with R-400 or R-500 series refrigerants Once liquid refrigerant is removed from the cylinder, the refrigerant can be charged into the system as a liquid or vapor as desired. Use gauge manifold or a throttling valve to flash the liquid to vapor if required.How would you remove moisture from refrigerant in a system quizlet?
To remove moisture from the refrigerant in a system, it should be changed routinely or any time the system is opened. How can you tell through a sight glass if there is excess moisture in the system? Look for color changes in the refrigerant. Using large vacuum pumps can lead to freezing of water in the system.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?
Owners or operators must take corrective action when an appliance with a full charge of 50 or more pounds is discovered to be leaking ozone depleting refrigerant at a rate that exceeds the applicable trigger rate.What precautions should be taken when charging liquid through the suction service valve?
What precautions should be taken when charging liquid through the suction service valve? Restrict the flow of liquid if the amperage is above 10% of RLA or the valve frost.What should system that use r407c be leak checked with?
What should systems that use R-407C be leak checked with? Pressurized nitrogen and a trace amount of R-407C.What is a deep vacuum usually measured in?
microns
What can happen when using a large vacuum pump to evacuate a system?
When evacuating a system, the use of a large vacuum pump could: A) cause trapped oil to freeze. B) cause trapped refrigerant to freeze.When did recovery and recycling equipment manufactured after November 15 1993?
When using recovery and recycling equipment manufactured AFTER November 15, 1993, technicians must evacuate an appliance component containing MORE than 200 pounds of CFC-12 to the following level before making a major repair: 15 inches of Hg vacuum.What is located after the evaporator?
An air conditioner's evaporator coil, also called the evaporator core, is the part of the system where the refrigerant absorbs heat. That is, it's where the cold air comes from. The evaporator coil is located inside or near the air handler where the blower fan is.What is the approximate pressure of a storage cylinder of recovered R 410a?
RECOVERY OF R-410A For R-410A, a working pressure capability of at least 400 psi is recommended (this includes recovery cylinders). Standard DOT recovery cylinders rated for 350 psi should not be used.Which of the following are included in EPA's definition of a small appliance?
epa regulations include which of the following in definition of a small appliance: A: products manufactured, charged and hermetically sealed in a factory.Why would a recycling or recovery equipment using hermetic compressor overheat when drawing deep vacuums?
Both recycling and recovery equipment using hermetic compressors have the potential to overheat when drawing a deep vacuum because the unit relies on the flow of refrigerant through the compressor for cooling. After recovering liquid refrigerant, any remaining vapor is condensed by the recovery system. 
