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| What are the typical uses of the center port of gauge set? |
| What color are the gauges on a manifold gauge set? |
| What are the typical ranges of pressure measurements used on the gauges of a manifold gauge set? |
| Is the refrigerant leaving a condenser at a high or low pressure? Is it a liquid or a gas? |
| Is the refrigerant entering the expansion valve (variable metering device) a liquid or gas? |
| Is the pressure of the refrigerant entering the compressor high or low? |
| Where in a refrigerant circuit does a liquid boil to absorb heat? |
| The refrigerant in the suction line is a gas that has been heated above its saturation. What is this condition called? |
| What can cause liquid refrigerant to migrate to a compressor crankcase? |
| List two conditions that can quickly damage a compressor that is starting to run? |
| What system failures require taking an oil sample? |
| Is flushing with refrigerant an acceptable tube cleaning method? |
| In addition to preventing and repairing leaks, what else should a technician do to conserve refrigerant? |
| What factors affect the speed of an evacuation? |
| How should gauge set hoses be sized for use in evacuating a system? |
| When evacuating, what is the benefit of using short hoses with large diameters? |
| which connection determines the preferred size of hoses used with a vacuum pump? |
| As the capacity and suction hose size increase, what happens to the time needed for an evacuation? |
| What purpose is served by heating a system during dehydration? |
| Does a thorough evacuation remove moisture from a system? |
| What can happen to oil in the compressor if the moisture is left in an operating system? |
| What is the result of over-evacuating a system? |
| How can a system be leak checked using a low pressure gauge? |
| How close should the vacuum gauge be connected to the vacuum pump during evacuation? |
| When measuring the vacuum of a system being evacuated, the system must be isolated. What must be done to the vacuum pump? |
| What is ozone? |
| How much ozone can a chlorine atom destroy in the stratosphere? |
| What is Ozone Depletion Potential (ODP)? |
| What is CFC? |
| Which refrigerants are CFC's? |
| Which chemical in the CFC refrigerants does the most damage to the ozone layer? |
| What is an HCFC? |
| Which refrigerants are HCFC's? |
| Which is more harmful to the ozone layer, a CFC or an HCFC? |
| What is it about CFC's that make them more harmful to the stratosphere? |
| What is an HFC? |
| Which refrigerants are HFC's? |
| What is the ODP of the HFC refrigerant? |
| Which refrigerants contain chlorine? |
| Which refrigerants have high ODP? |
| Which refrigerants have low ODP? |
| What is an azeotrope refrigerant? |
| Is one of the components of R-500 a CFC? |
| Does stratospheric ozone help or hurt the work of the earth's protective shield? |
| What chemical in the stratosphere tells us ozone depletion is occurring? |
| How do we know the chlorine in the stratosphere is coming from CFC's? |
| How do we know CFC's get to the stratosphere? |
| What role does the ozone layer play in protecting the earth? |
| What are the effects on health from increased ultraviolet radiation? |
| What are the effects on the environment? |
| Is ozone depletion a problem for the United States only or a global problem? |
| What is the Montreal Protocol? |
| The Montreal Protocol calls for the regulation of what chemicals? |
| On what date was the production and importation of all CFC's phased out? |
| Where will we get replacements? |
| What steps are called for by the Clean Air Act? |
| What is prohibited by the Clean Air Act? |
| Do state and local laws have priority over federal law? Can they be less strict? |
| To prevent damage to the ozone layer, the U.S. is making laws to capture the CFC's now in use. What else does the new law do to restrict the release of CFC's? |
| By recovering refrigerants, we ensure adequate supplies and prevent venting. What else does the recovery of refrigerants accomplish? |
| The Clean Air Act phases out CFC/HCFC production and prohibits venting. What else does it require? |
| Falsifying or failing to keep required records, failing to reach required evacuation levels and knowingly releasing CFC or HCFC refrigerants, are a violations of the Clean Air Act. What activity with a substitute refrigerant is also a violation? |
| Which refrigerants must be recovered prior to opening a system? |
| What releases of a CFC and HCFC are violations of the Clean Air Act? |
| On what date did it become illegal to vent CFC and HCFC refrigerants? |
| Which appliances are covered by Section 608? |
| What is the primary reason the EPA requires a service aperture or process stub on all appliances? |
| Who sets the regulations for recovery machines? |
| What is a "self-contained" recovery machines? |
| Is HCFC-123 a "low or "high" pressure refrigerant? |
| Is CFC-12 a "low" or "high" pressure refrigerant? |
| What is the smallest container in which refrigerants may be sold to a Section 608 certified technicians. |
| What must you do to the refrigerant in an appliance before disposing of the appliance? |
| Who is responsible for removing the refrigerant from household refrigerators prior to disposal? |
| What is the penalty for violation of the Clean Air Act? |
| How much is the bounty for information leading to a conviction? |
| What ca happen if a technician cannot demonstrate an ability to use recovery or recycling equipment? |
| What is the name of the process that removes refrigerant from a system and stores it without testing or processing? |
| What is the name for the process that removes moisture and acids from refrigerant but does not test the refrigerant? |
| What is the name for the process that removes moisture and acids from refrigerant and also chemically tests the refrigerant? |
| What must be done with reclaimed refrigerant before it can be legally resold? |
| What is the preferred instrument for detecting small leaks? |
| What is an inert gas typically used in leak detection? |
| What is typically indicated by a dehydrated system failing to hold a vacuum? |
| What should be done when recovering the refrigerant form a system where the refrigerant has been improperly mixed? |
| Can mixed refrigerants be reclaimed? |
| What precautions should be taken when recovering refrigerant from systems with multiple service valves? |
| What is the effect of low ambient temperature on the time required to complete a recovery of refrigerant? |
| Technicians must explain to customers that recovery is necessary and it is required by law. What else should the technician tell the customer? |
| What is different about any leaks in systems charged with a blended refrigerant? |
| What is "temperature glide"? |
| What is ternary blend? |
| How should systems using blended refrigerants be charged? |
| Is there a "drop-in" refrigerant for CFC-12? |
| How do you leak check an HFC-134a system with a partial charge (no HFC-134a detector available)? |
| What is the preferred oil to be used with HFC-134a? |
| Can ester based oils be mixed with other oils? |
| What does "hygroscopic" mean? |
| What lubricant is recommended for use with a ternary blend? |
| Safety glasses and butyl-lined gloves should be worn for what procedures? |
| What safety component must be used whenever dry nitrogen is used to pressurize a system? |
| Safety rules for technicians such as: no open flame or hot steam near a refrigerant, never cutting or brazing a charged refrigerant line, and never using oxygen to purge or pressurize lines, are all important. Which one should a technician follow? |
| What is a Material Safety Data Sheet? |
| What safety classification within the ASHRAE standard is the most safe? |
| What is caused by tie inhaling of refrigerant vapors? |
| What is the major causes of death involving refrigerants? |
| What breathing problem can be caused by CFC-12? |
| How can ice be removed from a sight glass? |
| What must be done with a badly corroded relief valve? |
| Where can you find the allowable test pressure on a system? |
| Can oxygen be used to check for leaks? If not, why not? |
| What is the likely result of heating a recovery cylinder with an open flame? |
| What is the primary purpose of a disposable cylinder? |
| To what internal pressure should a disposable cylinder be reduced to for disposal? |
| Should you ever use a disposable cylinder for refrigerant recovery? |
| To dispose of a cylinder you should be sure all refrigerant is recovered and the cylinder is no longer usable. What else should you do? |
| For safety, refrigerant chlinders should not be rusted or damaged and always properly color coded. What additional step should also be taken with these cylinders? |
| What is the proper color code for recovery cylinders? |
| What is the maximum percent by weight that a cylinder may be filled? |
| What can happen if a cylinder is overfilled? |
| List three methods for measuring the fill level of a recovery cylinder. |
| Wow often must reusable cylinders be hydrostatically tested? |
| Why must only refillable cylinders be used for transport? |
| What must be affixed to a refrigerant cylinder prior to its shipment to a reclaimer? |
| What is the purpose of a DOT classification tag? |
| What is the correct shipping position for a refrigerant cylinder? |
| What is the EPA definition of a small appliance? |
| Does the EPA require the repair of leaks on small appliances? |
| What EPA certification type must technicians have to service any appliance that EPA calls a "small appliance?" |
| What service aperture may be used on small appliance? |
| What is the name for a fitting, used to connect a recovery device to an appliance, which can close to prevent loss of refrigerant form hoses? |
| What is the primary purpose for using hand valves or self-sealing hoses when using a gauge set? |
| Which refrigerants must be recovered under Section 608 of the EPA regulations? |
| Is there a "drop-in" refrigerant for CFC-12? |
| What is the replacement refrigerant for CFC-12 in household refrigerators? |
| What can be determined by taking an accurate temperature and pressure reading of a container holding a recovered refrigerant? |
| When doing a non-condensables check, a recovery cylinder should stabilize in temperature before any readings are taken. Why? |
| What is the internal pressure of CFC-12 refrigerant stored at 75 deg. F? |
| What is the exception to the rule that says that someone servicing and appliance must have at least one self-contained recovery machine available at their place of business? |
| Ammonia, hydrogen, and water can be found in the refrigerators in some campers and other recreational vehicles. Should these compounds be recovered with EPA approved recovery equipment? |
| May the nitrogen used for purging or pressurizing a system be vented to the atmosphere? |
| When may a technician recover only 80% of the refrigerant in a small appliance? |
| May a technician use a passive recovery machine for recovery from a domestic refrigerator? |
| What requirements are placed on recovery machines built after November 15, 1993? |
| When using a recovery machine manufactured after November 15, 1993, what percentage of the refrigerant must be recovered in a household refrigerator with an operating compressor? What percentage if the compressor is NOT operating? |
| Is a certified technician responsible for future changes in EPA regulations? |
| What type of certification is required to purchase CFC and HCFC refrigerants? |
| What must be done with any regulated refrigerant vented from a graduated charging cylinder? |
| What first step must you always take before starting a recovery of refrigerant form any equipment? |
| What is a "system-dependent" recovery machine? |
| Describe a system-dependent (passive) recovery process for small appliances. |
| What two conditions require that you access both the high and low side of the system for refrigerant recovery? |
| What are the benefits of accessing the low and high side access valves when recovering refrigerant from a system with an inoperative compressor? |
| How should you access the system and should you run the compressor when using a system-dependent (passive) recovery on a refrigerator with an operable compressor? |
| Which access valve (s) should you connect to when recovering from a system with an operating compressor and a completely restricted capillary tube? |
| When using a self-contained (active) recovery device, what two conditions can cause excessive pressure on the recovery machine's high side? |
| Why should defrost heaters be turned on during a recovery from a small appliance? |
| When should entrapped refrigerant from oil be recovered? |
| What does striking the appliance compressor do during a recovery? |
| A recovery machine should be checked daily for what? |
| Can a standard vacuum pump be used as a recovery machine? |
| Should technicians ever mix refrigerants in the field? |
| How should you recover refrigerant that is different from the refrigerant you usually recover? |
| What can a reclaimer do with any mixed refrigerant you ship to them? |
| To ship recovered refrigerant you must label the container and complete all necessary paperwork. What else should you do? |
| What federal agency sets the standards for portable refillable tanks or containers used to ship CFC or HCFC refrigerants? |
| Safety glasses and butyl-lined gloves should be worn fro what procedures? |
| Piercing valves are used for what purpose? |
| On what materials are piercing valves used? |
| What should be done to a piercing type Schrader valve after it is installed on a charged system? |
| Why should solder-less type piercing valves be removed after completion of repairs? |
| What are the critical maintenance checks done to a Schrader valve? |
| What does a pungent odor detected after opening a system mean? |
| What do you do if the oil is contaminated? |
| What system pressure would indicate a recovery should not be performed? |
| What are the current methods used to monitor the 80% fill level in a recovery tank? |
| Why do large refrigerant leaks cause suffocation? |
| Before entering an area of a large leak of refrigerant what apparatus must be worn? |
| What should be done if a large leak occurs and no breathing apparatus is available? |
| Which acids are formed when refrigerant touches sources of high heat? |
| What safety component must be used whenever dry nitrogen is used to pressurize a system? |
| What information does DOT require when shipping refrigerant cylinders? |
| Which government agency sets the standards for refillable refrigerant cylinders used to transport CFC and HCFC refrigerants? |
| What component is always replaced after a a system is opened for service? |
| What is the purpose of the moisture indicator in a sight glass? |
| What does "back-seating" a suction valve do? |
| What will non-condensables do to the pressures in a refrigerant circuit? |
| What causes oil foaming in a system and where does it normally occur? |
| What system failures require taking an oil sample? |
| A vacuum pump that is too large can cause what problem? |
| Where is a receiver typically installed on a system? |
| What will be the boiling temperature of HFC-134a be at 0 PSIG? |
| Is it a requirement that recovery machines contain an oil separator? |
| Which refrigerant is typically used on a residential split system air conditioner? |
| Is the refrigerant leaving a receiver a liquid or a gas? Is it at a high or low pressure? |
| What is the initial charging method of a system when the charge is specified at 70 pounds? |
| Is the receiver on the high or low side of a system? |
| What is the minimum recommended capability (measured in microns) of a vacuum pump used for evacuations? |
| What is the pressure of a CFC-12 machine at 72 deg. F while the machine is idle? |
| What is the preferred unit of measurement for checking a deep vacuum? |
| Where is an accumulator located in a refrigeration system? |
| To prevent freezing of any moisture in a CFC-12 system, vapor should first be charged until the pressure is at what level? |
| What gas should be used during an evacuation to increase pressure to prevent freezing? |
| What is the purpose of a compressor heater? |
| How is moisture remaining from an evacuation removed from the refrigerant in a system? |
| What is the preferred method of leak checking a built-up system prior to charging? |
| What would a technician initially look for during a visual inspection of a leaking hermetic system? |
| What is typically indicated by excessive superheat on a high-pressure system? |
| Which refrigerant should be used for a trace charge during leak detection? |
| How do you leak check an HFC-134a system with a partial charge (no HFC-134a detector available)? |
| For what purpose are soap bubbles used in leak checking? |
| Shaft seals on an open type compressor are susceptible to what failures? |
| What leak rate is permissible on industrial and process refrigeration? |
| What leak rate is permissible on equipment (other than industrial or process equipment) that contains more that 50 lbs. of refrigerant? |
| What is the easiest way to check the type of refrigerant used in a packaged rooftop system? |
| Refrigerant will recover fastest in which phase, liquid or vapor? |
| Which refrigerant line should a recovery machine be attached to in order to recover liquid refrigerant from a system? |
| After a liquid recovery, what must be done with the vapor still in the system? |
| Recovering in a vapor phase reduces unwanted loss of what? |
| On a high pressure system recovery, should the recovery cylinder be heated or cooled? |
| What must be done to a recovery machine when changing to a different refrigerant? |
| What besides filters must periodically be changed out on a recovery machine? |
| Recovered refrigerant can contain oil and acids. Name another compound found in refrigerants? |
| What is the water source for a condensing coil on a water-cooled recovery machine? |
| What access location should you use when recovering from an air cooled system with its condenser several feet above the evaporator? |
| What access location should you use when recovering from a system with its condenser below the evaporator? |
| Before using a recovery unit, the technician should check service valve positions and check the recovery unit oil level. What additional step must be taken? |
| What is the primary purpose for using hand valves or self-sealing hoses when using a gauge set? |
| What can cause recovery equipment with a hermetic compressor to overheat when drawing a deep vacuum? |
| What is the reason for not operating a hermetic refrigeration compressor while it is in a deep vacuum? |
| What is the reason for not starting a reciprocating compressor with its discharge service valve closed? |
| When can a "system-dependent" recovery device be used? |
| What vacuum level must you reach when recovering from a system with 38 pounds of R-502 using a recovery machine manufactured in 1995? |
| What is EPA's definition of a "major repair"? |
| Prior to making a major repair, what vacuum level must you pull when using recovery equipment manufactured in 1996 on a unit with 215 lbs. of CFC-12? |
| What vacuum level must you pull when using recovery equipment manufactured in 1992 when disposing of an appliance containing 12 lbs. of R-500? |
| Under what circumstances may a technician recover the CFC refrigerant in an appliance to atmospheric pressure only? |
| What procedure should be performed on an empty recovery cylinder before it is used for storing recovered refrigerant? |
| What may legally be done with the refrigerant recovered from a system in order to replace a condenser coil? |
| When servicing an operating unit with a receiver, where should the recovery hoses be attached to the unit? |
| In order to recover from a system with parallel compressors, the individual compressors must be isolated. Why? |
| Which refrigerant (s) require and equipment room monitor per ASHRAE Standard 15? |
| What protection is mandatory to protect a system against damage from excessive pressure? |
| Are multiple relief valves connected in series or parallel? |
| Why is the use of a regulator required when using dry nitrogen? |
| How can ice be removed from a sight glass? |
| How high should you pressurize an idle low pressure chiller to prevent air accumulation? |
| What effect does air in a chiller have on head pressure? |
| What system failures require taking and oil sample? |
| Why must water be circulated through a chiller during refrigerant recovery? |
| What is the lowest access valve on a low pressure chiller? |
| Where is a centrifugal chiller's rupture disk attached? |
| What is the typical pressure setting for a low pressure chiller's rupture disk? |
| Where is the outlet of a rupture disk discharged? |
| How is a chiller typically charged? |
| What minimum saturation temperature needs to be achieved before liquid is charged into a chiller? |
| To prevent freezing of water when charging a chiller, what pressure should be reached with vapor before using liquid CFC-11? |
| What could result from liquid refrigerant being charged into a chiller that is holding a 29 inch Hg. vacuum? |
| What function is served by a purge unit on a chiller? |
| What is the most likely cause of air leaks into a chiller refrigerant circuit? |
| How is a purge unit connected on a low pressure chiller? |
| Where is the suction of a purge unit connected? |
| What is a high efficiency purge unit? |
| Shaft seals on an open type compressor are susceptible to what failures? |
| Purge units work best when they are not needed. How can purge unit operating time be reduced? |
| What is the maximum pressure that can be used when leak checking a low pressure chiller? |
| What is the preferred method of leak checking a charged low pressure chiller? |
| Where should you check for leaks between a chiller refrigerant tube and the water box? |
| What is a hydrostatic tube test kit used for? |
| What leak rate is permissible on industrial and process refrigeration? |
| What leak rate is permissible on equipment other than industrial and process equipment? |
| According to ASHRAE 3-1990, what rise is permitted in vacuum level during a standing vacuum test? |
| List two steps to reduce the run time of a purge unit. |
| Why should the water side of the evaporator and condenser be drained before recovering refrigerant from a chiller suspected of having tube leaks? |
| If a purge unit is operating excessively, what problem can you expect to find? |
| What condition would cause continuous excessive moisture collection in the purge unit of a low pressure refrigeration system? |
| Why should oil be warmed prior to removal from a low pressure chiller? |
| After liquid recovery, what must be done with the vapor still in the system? |
| Is recovery of refrigerant from a low pressure appliance typically started with liquid or vapor? |
| Where is the connection made for the water supply used on a water cooled recovery unit? |
| What should be the maximum pressure on the discharge of a recovery machine for low pressure systems? |
| What should be done with the water pumps during a recovery form a low pressure chiller? |
|
What is EPA's definition of a "major repair"? |
| What recovery vacuum must be met on a low pressure appliance using a machine built in 1992? |
| Why should you wait a few minutes after reaching the required recovery vacuum on an appliance to see if pressure rises? |
| Under what circumstances may the recovery from an appliance be stopped without reaching the prescribed level? |
| Is it a requirement that recycling and recovery equipment be capable of handling more than one refrigerant? |
| Is it permissible to warm the refrigerant under EPA's regulations to pressurize a low pressure system to do a non-major repair? |
| What final vacuum level is required for recovering refrigerant from a low pressure system if the technician is using recovery equipment manufactured BEFORE November 15, 1993? AFTER November 15, 1993? |
| A vacuum pump that is too large for a particular system can cause what problem? |
| How can you prevent moisture from freezing during dehydration? |
| Are multiple relief valves connected in series or parallel? |
| ASHRAE Standard 15 covers refrigerant level monitoring for what refrigerants? |
| According to ASHRAE Standard 15, what is the standard for refrigerant concentration for a machine room that must not be exceeded without activating an alarm and starting ventilation in the machine room? |
| List four safety procedures that should be followed when working with liquid low pressure refrigerant. |
| What is the toxicity and flammability rating of HCFC-123 per ASHRAE Standard 34? |