JRTI HVAC EPA Assessment Questions with
Answers
1. After a liquid recovery, what must be done with the vapor still in the system? -
Correct Answer Vapor recovery must be performed
2. Recovered refrigerant can contain oil and acids. Name another compound found
in refrigerants? - Correct Answer Moisture
3. When can a "system-dependent" recovery device be used? - Correct Answer
On small appliances as long as the device meets EPA standards, and the
technician adheres to the servicing procedures specified for the recovery
equipment.
4. What vacuum level must you reach when recovering from a system with 38
pounds of R-502 using a recovery machine manufactured is 1995? - Correct
Answer 10 inches Hg
5. In order to recover from a system with parallel compressors, the individual
compressors must be isolated. Why? - Correct Answer It isolates the refrigerant
that must be recovered from the rest of the system.
6. What procedures should be performed on an empty recovery cylinder before it is
used for storing recovered refrigerant? - Correct Answer It must be evacuated
from all non-condensables.
7. On a high-pressure system recovery, should the recovery cylinder be heated or
cooled? - Correct Answer Cooled.
8. Which refrigerant line should a recovery machine be attached to in order to
recover liquid refrigerant from the system? - Correct Answer Liquid line.
9. What protection is mandatory to protect a system against damage from
excessive pressure? - Correct Answer Pressure relief device.
10. What is the easiest way to check the type of refrigerant in a packaged rooftop
system? - Correct Answer By the equipment data plate.
11. What can cause recovery equipment with a hermetic compressor to overheat
when drawing a deep vacuum? - Correct Answer No airflow over the
compressor body or no suction gas flow over the internal motors, or a
combination of the two.
, 12. What access location should you use when recovering from a system with its
condenser below the evaporator? - Correct Answer Liquid line.
13. What is the preferred oil to be used with HFC-134a? - Correct Answer
Polyolester
14. What is the reason for not starting a reciprocating compressor with its discharge
service valve closed? - Correct Answer To prevent overheating the compressor
motor.
15. What component is always replaced after a system is opened for service? -
Correct Answer filter-driers.
16. A vacuum pump that us too large can cause what problem? - Correct Answer It
can cause moisture to freeze in the system.
17. Is it a requirement that recovery machines contain an oil separator? - Correct
Answer No.
18. What is the initial charging method of a system when the charge is specified at
70 pounds? - Correct Answer Charge in liquid state.
19. What is the pressure of a CFC-12 machine at 72 degrees F while the machine is
idle? - Correct Answer 73 PSIG.
20. To prevent freezing of any moisture in a CFC-12 system, vapor should first be
charged until the pressure is at what level? - Correct Answer 33 PSIG.
21. How is moisture remaining from an evacuation removed from the refrigerant in
the system? - Correct Answer By the filter-drier.
22. For what purpose are soap bubbles used in leak checking? - Correct Answer
For a visual check for leaks.
23. What is typically indicated by excessive superheat on a high-pressure system? -
Correct Answer Under charged system, possibly the result of a leaky system.
24. What is the purpose of the moisture indicator in a sight glass? - Correct Answer
To permit a check of moisture content in the system.
25. Where is a receiver typically installed on a system? - Correct Answer At the
outlet of the compressor.
26. What causes oil foaming in a system and where does it normally occur? -
Correct Answer Oil that is mixed with refrigerant will foam in the compressor
crankcase.
Answers
1. After a liquid recovery, what must be done with the vapor still in the system? -
Correct Answer Vapor recovery must be performed
2. Recovered refrigerant can contain oil and acids. Name another compound found
in refrigerants? - Correct Answer Moisture
3. When can a "system-dependent" recovery device be used? - Correct Answer
On small appliances as long as the device meets EPA standards, and the
technician adheres to the servicing procedures specified for the recovery
equipment.
4. What vacuum level must you reach when recovering from a system with 38
pounds of R-502 using a recovery machine manufactured is 1995? - Correct
Answer 10 inches Hg
5. In order to recover from a system with parallel compressors, the individual
compressors must be isolated. Why? - Correct Answer It isolates the refrigerant
that must be recovered from the rest of the system.
6. What procedures should be performed on an empty recovery cylinder before it is
used for storing recovered refrigerant? - Correct Answer It must be evacuated
from all non-condensables.
7. On a high-pressure system recovery, should the recovery cylinder be heated or
cooled? - Correct Answer Cooled.
8. Which refrigerant line should a recovery machine be attached to in order to
recover liquid refrigerant from the system? - Correct Answer Liquid line.
9. What protection is mandatory to protect a system against damage from
excessive pressure? - Correct Answer Pressure relief device.
10. What is the easiest way to check the type of refrigerant in a packaged rooftop
system? - Correct Answer By the equipment data plate.
11. What can cause recovery equipment with a hermetic compressor to overheat
when drawing a deep vacuum? - Correct Answer No airflow over the
compressor body or no suction gas flow over the internal motors, or a
combination of the two.
, 12. What access location should you use when recovering from a system with its
condenser below the evaporator? - Correct Answer Liquid line.
13. What is the preferred oil to be used with HFC-134a? - Correct Answer
Polyolester
14. What is the reason for not starting a reciprocating compressor with its discharge
service valve closed? - Correct Answer To prevent overheating the compressor
motor.
15. What component is always replaced after a system is opened for service? -
Correct Answer filter-driers.
16. A vacuum pump that us too large can cause what problem? - Correct Answer It
can cause moisture to freeze in the system.
17. Is it a requirement that recovery machines contain an oil separator? - Correct
Answer No.
18. What is the initial charging method of a system when the charge is specified at
70 pounds? - Correct Answer Charge in liquid state.
19. What is the pressure of a CFC-12 machine at 72 degrees F while the machine is
idle? - Correct Answer 73 PSIG.
20. To prevent freezing of any moisture in a CFC-12 system, vapor should first be
charged until the pressure is at what level? - Correct Answer 33 PSIG.
21. How is moisture remaining from an evacuation removed from the refrigerant in
the system? - Correct Answer By the filter-drier.
22. For what purpose are soap bubbles used in leak checking? - Correct Answer
For a visual check for leaks.
23. What is typically indicated by excessive superheat on a high-pressure system? -
Correct Answer Under charged system, possibly the result of a leaky system.
24. What is the purpose of the moisture indicator in a sight glass? - Correct Answer
To permit a check of moisture content in the system.
25. Where is a receiver typically installed on a system? - Correct Answer At the
outlet of the compressor.
26. What causes oil foaming in a system and where does it normally occur? -
Correct Answer Oil that is mixed with refrigerant will foam in the compressor
crankcase.
