Term How much ozone can a chlorine atom destroy in the stratosphere? Definition Through recovery of existing refrigerants. Definition Recover and recycle used refrigerants. Term Purge units work best when they are not needed. Term Can oxygen be used to check for leaks? Definition A recovery container that is not properly evacuated or one that has unopened valve. The technician must achieve a passing score of 70% in each certification type they are attempting.
Term What should be done to a piercing type Schrader valve after it is installed on a charged system? Term By recovering refrigerants, we ensure adequate supplies and prevent venting. Definition Charged in liquid state. Once an exam is received at Mainstream, it is graded within 2 business days. Definition Liquid through the evaporator charging valve. Review questions at the end will help quiz you on what you just read.
Term Shaft seals on an open type compressor are susceptible to what failures? We are developing an online class as well as a home study guide. Definition At the outlet of the condenser. Definition Only when the person is working on a small appliance. Scrap metal recyclers, landfill owner, etc Term What is the penalty for violation of the Clean Air Act? Term Is the refrigerant leaving a receiver a liquid or a gas? Definition Helps to free refrigerant that may be trapped in the oil. Definition Cleaned with an alcohol spray. Term Why should solder-less type piercing valves be removed after completion of repairs? Term How can ice be removed from a sight glass? Definition Evacuate or cool a cylinder. Term which connection determines the preferred size of hoses used with a vacuum pump? The equipment includes residential air conditioners and heat pumps, supermarket refrigeration and process refrigeration.
What else does it require? Term What is the smallest container in which refrigerants may be sold to a Section 608 certified technicians. Term Recovered refrigerant can contain oil and acids. Definition In theory yes, but unlikely. Can they be less strict? Term Before using a recovery unit, the technician should check service valve positions and check the recovery unit oil level. Term To what internal pressure should a disposable cylinder be reduced to for disposal? Definition Slightly above atmospheric pressure.
This webinar will help you understand these classes, along with the opportunities these refrigerants can offer. Definition If the compressor is located in the coldest location in the circuit. Term What is the result of over-evacuating a system? What exactly defines a technician? First it would have to be certifiable, second it would have to be connected to a non-pressurized recovery container. How do you test for a leak? Term Who sets the regulations for recovery machines? Definition Electronic leak detector and Ultrasonic detector. Term Does a thorough evacuation remove moisture from a system? Definition From high altitude air sampling measurements.
Definition Turn it off and valve it off. Term Is the pressure of the refrigerant entering the compressor high or low? Term What is the easiest way to check the type of refrigerant used in a packaged rooftop system? These references can be purchased individually or in a bundle. Persons who work on stationary equipment or use refrigerant designed for these systems can become certified by passing a proctored Section 608 examination. Term Which refrigerants must be recovered prior to opening a system? What additional step should also be taken with these cylinders? The older version of the test is currently available online English Only and by paper test in English, Spanish, and Italian. Term On what materials are piercing valves used? Definition Self contained breathing apparatus. Term What steps are called for by the Clean Air Act? Definition It might mean acids are present due to a compressor burnout.
What must be done to the vacuum pump? Term When doing a non-condensables check, a recovery cylinder should stabilize in temperature before any readings are taken. Definition To speed up moisture removal. Term How can a system be leak checked using a low pressure gauge? Term What are the benefits of accessing the low and high side access valves when recovering refrigerant from a system with an inoperative compressor? Definition Any time oil is removed from a large system and on small appliances when using system dependent recovery with a non-operating compressor. A passing score of 70%, or 18 out of 25 correct, is required in order to be certified. Term What role does the ozone layer play in protecting the earth? Definition To allow access to the sealed system for recovery. Definition A blend of three different refrigerants. Term List three methods for measuring the fill level of a recovery cylinder.
Type I programs that offer a mail-in testing option are also available. Definition Pump size, hose length, hose diameter, size of system to be evacuated, ambient temperature, suction line size, and the amount of moisture in the system. Definition Insure that liquid is not trapped between service valves. Definition 10 inches of Hg. Term Why must only refillable cylinders be used for transport? Definition Oil that absorbs moisture easily. Term What is the Montreal Protocol? Review questions at the end will help you to quiz yourself on what you just read.