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Questions and Answers
What is the maximum period for inspection and recertification of cylinders containing noncorrosive refrigerants?
What is the maximum period for inspection and recertification of cylinders containing noncorrosive refrigerants?
- Every 3 years
- Every 7 years
- Every 10 years (correct)
- Every 5 years
Which device is NOT a pressure release protective device for refrigerant cylinders?
Which device is NOT a pressure release protective device for refrigerant cylinders?
- Fusible plug
- Pressure gauge (correct)
- Spring-operated relief valve
- Rupture disc
What is the primary purpose of the packing around the valve in storage cylinders?
What is the primary purpose of the packing around the valve in storage cylinders?
- To enhance cylinder durability
- To facilitate quick release
- To prevent leakage (correct)
- To limit pressure buildup
Which of the following cylinder types is specifically used for the recycling of refrigerant?
Which of the following cylinder types is specifically used for the recycling of refrigerant?
What is the primary regulatory body that prescribes guidelines for refrigerant cylinders?
What is the primary regulatory body that prescribes guidelines for refrigerant cylinders?
How often must cylinders containing corrosive refrigerants be inspected and recertified?
How often must cylinders containing corrosive refrigerants be inspected and recertified?
Which of the following best describes the purpose of a gauge manifold in refrigeration?
Which of the following best describes the purpose of a gauge manifold in refrigeration?
What should always be in place on a storage cylinder during moving or shipping?
What should always be in place on a storage cylinder during moving or shipping?
What do ultrasonic leak detectors primarily detect?
What do ultrasonic leak detectors primarily detect?
Which type of vacuum pump is typically used in a deep-vacuum method?
Which type of vacuum pump is typically used in a deep-vacuum method?
What purpose does oil serve in vacuum pumps?
What purpose does oil serve in vacuum pumps?
How should oil in vacuum pumps be maintained?
How should oil in vacuum pumps be maintained?
What is the primary function of refrigerant recovery?
What is the primary function of refrigerant recovery?
What does Section 608 of the Clean Air Act mandate regarding refrigerants?
What does Section 608 of the Clean Air Act mandate regarding refrigerants?
Which method utilizes a single pump mechanism?
Which method utilizes a single pump mechanism?
What elements are typically checked when maintaining a vacuum pump's oil?
What elements are typically checked when maintaining a vacuum pump's oil?
What is the primary purpose of having recovery equipment certified by an EPA-approved organization?
What is the primary purpose of having recovery equipment certified by an EPA-approved organization?
Which of the following describes refrigerant recycling?
Which of the following describes refrigerant recycling?
What is required for refrigerant to be considered reclaimed?
What is required for refrigerant to be considered reclaimed?
What actions should a technician take to conserve refrigerant effectively?
What actions should a technician take to conserve refrigerant effectively?
Which statement best describes the function of digital charging scales?
Which statement best describes the function of digital charging scales?
What happens to recycled refrigerant after cleaning?
What happens to recycled refrigerant after cleaning?
What does proper refrigerant conservation involve?
What does proper refrigerant conservation involve?
Which of the following statements regarding recovered refrigerant is true?
Which of the following statements regarding recovered refrigerant is true?
What is the purpose of using a fixed wrench when cracking open a stuck valve?
What is the purpose of using a fixed wrench when cracking open a stuck valve?
Which service valve is categorized as a low-side valve?
Which service valve is categorized as a low-side valve?
What maintenance step helps prevent leaks in service valves?
What maintenance step helps prevent leaks in service valves?
What feature does a Schrader valve core provide?
What feature does a Schrader valve core provide?
What is NOT a type of high-side service valve?
What is NOT a type of high-side service valve?
Which method is used to access systems without access ports?
Which method is used to access systems without access ports?
What is recommended to reduce rusting on the valve body?
What is recommended to reduce rusting on the valve body?
What describes the function of piercing valves?
What describes the function of piercing valves?
What does a compound gauge measure?
What does a compound gauge measure?
What is a characteristic of a high-pressure gauge?
What is a characteristic of a high-pressure gauge?
What should be done to calibrate gauges properly?
What should be done to calibrate gauges properly?
What type of damage can occur to gauges?
What type of damage can occur to gauges?
Which statement is true about service valves?
Which statement is true about service valves?
What is the primary function of low-side gauges?
What is the primary function of low-side gauges?
What types of pressure can a high-pressure gauge typically read?
What types of pressure can a high-pressure gauge typically read?
What is the role of front seated and back seated valves?
What is the role of front seated and back seated valves?
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Study Notes
Ultrasonic Leak Detectors
- Detect escaping vapor sound from pressurized systems.
- Handheld devices amplify sound and use LEDs or other indicators.
Vacuum Pumps
- Create vacuum for system evacuation before charging.
- Specifications include ultimate vacuum and free air displacement.
Types of Vacuum Pumps
- Single-stage pumps use a single mechanism, often in triple evacuation.
- Two-stage pumps have two mechanisms connected in series for deep vacuum.
Oil in Vacuum Pumps
- Lubricates the pump and seals against air and contaminants.
- Requires frequent replacement; check sight glass and test before each evacuation.
Refrigerant Recovery
- Removes refrigerant from systems for safe storage in external containers.
- Usually returned to the system after repair. Complies with Section 608 of the Clean Air Act.
Refrigerant Cylinders
- Types include storage, disposable, and recovery cylinders.
- Safety features: spring-operated relief valves, rupture discs, and fusible plugs.
Cylinder Regulations
- Set by the Department of Transportation (DOT) for technician safety.
- Inspection and recertification: every 5 years for corrosive refrigerants, 10 years for non-corrosive.
Storage Cylinders
- 100-lb and 150-lb cylinders for charging refillable cylinders.
- Fitted with leak-proof valves and protective caps for transport.
Pressure Units
- Include millibars, pascals, torr, and millitorr.
Compound Gauge
- Measures both positive pressure and vacuum (low-side gauge).
High-Pressure Gauge
- Measures high-pressure values (high-side gauge), typically 0-500 psi or 0-800 psi.
Gauge Care and Calibration
- Damage caused by sudden pressure release or fluctuations.
- Calibration ensures 0 psi reading at sea level or specified elevation.
Service Valves
- Provide system access for readings, charging, and evacuation.
- Types include low-side (suction) and high-side (discharge/liquid line/receiver).
Service Valve Maintenance and Operation
- Clean and oil valve stems, coat bodies with lubricant, use correct wrenches, maintain packing.
Access Ports
- Small valve openings with Schrader valves for convenient system access.
Piercing Valves
- Pierce tubing to access small or portless systems; brazed-on or bolted-on designs.
Equipment Certification
- Recovery equipment must be EPA-approved and achieve required vacuum levels.
Refrigerant Recycling
- Cleans refrigerant for reuse by separating oil and using filter-driers.
- Recycled refrigerant cannot be sold but stays within the system or owner.
Refrigerant Reclaiming
- Reprocesses refrigerant to chemical purity (AHRI Standard 740).
- Reclaimed refrigerant can be used in any compatible unit.
Digital Charging Scales
- Electronic scales monitor refrigerant weight during charging and recovery.
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