,Table of Contents: NYC Fire Code Chapter 6, Refrigerating System
Basics, Certificate of Fitness Requirements
1. Chapter 1: Safety Controls - Page 4
2. Chapter 2: Fire Extinguishing Systems - Page 8
3. Chapter 3: Emergency Shutdown - Page 12
4. Chapter 4: Evaporators - Page 16
5. Chapter 5: NYC Fire Code Ch 6 - Page 20
6. Chapter 6: Expansion Valves - Page 24
7. Chapter 7: Condensers - Page 28
8. Chapter 8: Machinery Room Ventilation - Page 32
9. Chapter 9: Refrigerants Classification - Page 36
10. Chapter 10: Refrigerants Classification - Page 40
11. Chapter 11: Operating Logs - Page 44
12. Chapter 12: NYC Fire Code Ch 6 - Page 48
13. Chapter 13: Expansion Valves - Page 52
14. Chapter 14: Operating Logs - Page 56
15. Chapter 15: NYC Fire Code Ch 6 - Page 60
16. Chapter 16: Compressors - Page 64
17. Chapter 17: Operating Logs - Page 68
18. Chapter 18: Q-01 License Requirements - Page 72
19. Chapter 19: Compressors - Page 76
20. Chapter 20: Operating Logs - Page 80
21. Chapter 21: Refrigerants Classification - Page 84
22. Chapter 22: Expansion Valves - Page 88
23. Chapter 23: Machinery Room Ventilation - Page 92
24. Chapter 24: Emergency Shutdown - Page 96
25. Chapter 25: Expansion Valves - Page 100
,1. NGN-style: The operating engineer notices high discharge pressure at 280 psig on R-134a
system. The most appropriate action is This is NGN-style scenario requiring FDNY Z-51 COF
RSOE Q-01 judgment. The operating engineer must apply NYC Fire Code and safe
refrigeration practices. What is the most appropriate action per 2026/2027 code?
A. Isolate leak, recover refrigerant per EPA 608, and repair per ASME B31.5
B. Operate compressor with low oil pressure
C. Fail to log and notify supervisor of abnormal condition
D. Use open flame for leak detection
Answer: A
Rationale: Selected answer aligns with FDNY Z-51 study guide, NYC Fire Code, and industry best practices
for operating engineers. It covers system components, operating pressures, temperatures,
superheat/subcooling calculations, and emergency shutdown. It demonstrates NGN-style clinical judgment by
prioritizing assessments, recognizing unsafe conditions, and implementing corrective actions. Alternatives
represent dangerous practices like operating with bypassed safeties or inadequate ventilation. Critical for
passing COF exam. Focus: RSOE duties.
2. Per NYC Fire Code, a refrigerating system using Group A1 refrigerant exceeding 100 lbs
requires This is NGN-style scenario requiring FDNY Z-51 COF RSOE Q-01 judgment. The
operating engineer must apply NYC Fire Code and safe refrigeration practices. What is the
most appropriate action per 2026/2027 code?
A. Skip daily inspection and maintenance
B. Vent refrigerant to atmosphere violating EPA
C. Shut down system, activate ventilation, notify FDNY, and don PPE per Emergency Action Plan
D. Use open flame for leak detection
Answer: C
Rationale: Correct per FDNY Z-51 NYC Fire Code 2026, Certificate of Fitness for Refrigerating System
Operating Engineer, and RSOE Q-01 requirements. This addresses safe operation, refrigerant handling per
EPA 608, pressure vessel codes, and emergency procedures. It includes proper log keeping, safety controls
testing, and ventilation requirements for machinery rooms. Incorrect options violate Fire Code, ignore PSM, or
fail to protect life safety. Mastery is essential for COF and Q-01 licensure. Focus: refrigerant safety.
3. NGN-style: The operating engineer notices high discharge pressure at 280 psig on R-134a
system. The most appropriate action is This is NGN-style scenario requiring FDNY Z-51 COF
RSOE Q-01 judgment. The operating engineer must apply NYC Fire Code and safe
refrigeration practices. What is the most appropriate action per 2026/2027 code?
A. Operate compressor with low oil pressure
B. Fail to log and notify supervisor of abnormal condition
C. Log readings, test safety controls, maintain proper superheat/subcooling per manufacturer
D. Continue operating with bypassed safety controls
Answer: C
Rationale: Selected answer aligns with FDNY Z-51 study guide, NYC Fire Code, and industry best practices
for operating engineers. It covers system components, operating pressures, temperatures,
superheat/subcooling calculations, and emergency shutdown. It demonstrates NGN-style clinical judgment by
prioritizing assessments, recognizing unsafe conditions, and implementing corrective actions. Alternatives
represent dangerous practices like operating with bypassed safeties or inadequate ventilation. Critical for
passing COF exam. Focus: fire code compliance.
, 4. Per NYC Fire Code, a refrigerating system using Group A1 refrigerant exceeding 100 lbs
requires This is NGN-style scenario requiring FDNY Z-51 COF RSOE Q-01 judgment. The
operating engineer must apply NYC Fire Code and safe refrigeration practices. What is the
most appropriate action per 2026/2027 code?
A. Operate compressor with low oil pressure
B. Enter machinery room without SCBA during ammonia leak
C. Ignore high pressure alarm and reset without investigation
D. Isolate leak, recover refrigerant per EPA 608, and repair per ASME B31.5
Answer: D
Rationale: Correct per FDNY Z-51 NYC Fire Code 2026, Certificate of Fitness for Refrigerating System
Operating Engineer, and RSOE Q-01 requirements. This addresses safe operation, refrigerant handling per
EPA 608, pressure vessel codes, and emergency procedures. It includes proper log keeping, safety controls
testing, and ventilation requirements for machinery rooms. Incorrect options violate Fire Code, ignore PSM, or
fail to protect life safety. Mastery is essential for COF and Q-01 licensure. Focus: emergency response.
5. NGN-style: The operating engineer notices high discharge pressure at 280 psig on R-134a
system. The most appropriate action is This is NGN-style scenario requiring FDNY Z-51 COF
RSOE Q-01 judgment. The operating engineer must apply NYC Fire Code and safe
refrigeration practices. What is the most appropriate action per 2026/2027 code?
A. Skip daily inspection and maintenance
B. Vent refrigerant to atmosphere violating EPA
C. Use open flame for leak detection
D. Log readings, test safety controls, maintain proper superheat/subcooling per manufacturer
Answer: D
Rationale: Selected answer aligns with FDNY Z-51 study guide, NYC Fire Code, and industry best practices
for operating engineers. It covers system components, operating pressures, temperatures,
superheat/subcooling calculations, and emergency shutdown. It demonstrates NGN-style clinical judgment by
prioritizing assessments, recognizing unsafe conditions, and implementing corrective actions. Alternatives
represent dangerous practices like operating with bypassed safeties or inadequate ventilation. Critical for
passing COF exam. Focus: fire code compliance.
6. Per NYC Fire Code, a refrigerating system using Group A1 refrigerant exceeding 100 lbs
requires This is NGN-style scenario requiring FDNY Z-51 COF RSOE Q-01 judgment. The
operating engineer must apply NYC Fire Code and safe refrigeration practices. What is the
most appropriate action per 2026/2027 code?
A. Shut down system, activate ventilation, notify FDNY, and don PPE per Emergency Action Plan
B. Operate compressor with low oil pressure
C. Vent refrigerant to atmosphere violating EPA
D. Continue operating with bypassed safety controls
Answer: A
Rationale: Selected answer aligns with FDNY Z-51 study guide, NYC Fire Code, and industry best practices
for operating engineers. It covers system components, operating pressures, temperatures,
superheat/subcooling calculations, and emergency shutdown. It demonstrates NGN-style clinical judgment by
prioritizing assessments, recognizing unsafe conditions, and implementing corrective actions. Alternatives
represent dangerous practices like operating with bypassed safeties or inadequate ventilation. Critical for
passing COF exam. Focus: fire code compliance.
Basics, Certificate of Fitness Requirements
1. Chapter 1: Safety Controls - Page 4
2. Chapter 2: Fire Extinguishing Systems - Page 8
3. Chapter 3: Emergency Shutdown - Page 12
4. Chapter 4: Evaporators - Page 16
5. Chapter 5: NYC Fire Code Ch 6 - Page 20
6. Chapter 6: Expansion Valves - Page 24
7. Chapter 7: Condensers - Page 28
8. Chapter 8: Machinery Room Ventilation - Page 32
9. Chapter 9: Refrigerants Classification - Page 36
10. Chapter 10: Refrigerants Classification - Page 40
11. Chapter 11: Operating Logs - Page 44
12. Chapter 12: NYC Fire Code Ch 6 - Page 48
13. Chapter 13: Expansion Valves - Page 52
14. Chapter 14: Operating Logs - Page 56
15. Chapter 15: NYC Fire Code Ch 6 - Page 60
16. Chapter 16: Compressors - Page 64
17. Chapter 17: Operating Logs - Page 68
18. Chapter 18: Q-01 License Requirements - Page 72
19. Chapter 19: Compressors - Page 76
20. Chapter 20: Operating Logs - Page 80
21. Chapter 21: Refrigerants Classification - Page 84
22. Chapter 22: Expansion Valves - Page 88
23. Chapter 23: Machinery Room Ventilation - Page 92
24. Chapter 24: Emergency Shutdown - Page 96
25. Chapter 25: Expansion Valves - Page 100
,1. NGN-style: The operating engineer notices high discharge pressure at 280 psig on R-134a
system. The most appropriate action is This is NGN-style scenario requiring FDNY Z-51 COF
RSOE Q-01 judgment. The operating engineer must apply NYC Fire Code and safe
refrigeration practices. What is the most appropriate action per 2026/2027 code?
A. Isolate leak, recover refrigerant per EPA 608, and repair per ASME B31.5
B. Operate compressor with low oil pressure
C. Fail to log and notify supervisor of abnormal condition
D. Use open flame for leak detection
Answer: A
Rationale: Selected answer aligns with FDNY Z-51 study guide, NYC Fire Code, and industry best practices
for operating engineers. It covers system components, operating pressures, temperatures,
superheat/subcooling calculations, and emergency shutdown. It demonstrates NGN-style clinical judgment by
prioritizing assessments, recognizing unsafe conditions, and implementing corrective actions. Alternatives
represent dangerous practices like operating with bypassed safeties or inadequate ventilation. Critical for
passing COF exam. Focus: RSOE duties.
2. Per NYC Fire Code, a refrigerating system using Group A1 refrigerant exceeding 100 lbs
requires This is NGN-style scenario requiring FDNY Z-51 COF RSOE Q-01 judgment. The
operating engineer must apply NYC Fire Code and safe refrigeration practices. What is the
most appropriate action per 2026/2027 code?
A. Skip daily inspection and maintenance
B. Vent refrigerant to atmosphere violating EPA
C. Shut down system, activate ventilation, notify FDNY, and don PPE per Emergency Action Plan
D. Use open flame for leak detection
Answer: C
Rationale: Correct per FDNY Z-51 NYC Fire Code 2026, Certificate of Fitness for Refrigerating System
Operating Engineer, and RSOE Q-01 requirements. This addresses safe operation, refrigerant handling per
EPA 608, pressure vessel codes, and emergency procedures. It includes proper log keeping, safety controls
testing, and ventilation requirements for machinery rooms. Incorrect options violate Fire Code, ignore PSM, or
fail to protect life safety. Mastery is essential for COF and Q-01 licensure. Focus: refrigerant safety.
3. NGN-style: The operating engineer notices high discharge pressure at 280 psig on R-134a
system. The most appropriate action is This is NGN-style scenario requiring FDNY Z-51 COF
RSOE Q-01 judgment. The operating engineer must apply NYC Fire Code and safe
refrigeration practices. What is the most appropriate action per 2026/2027 code?
A. Operate compressor with low oil pressure
B. Fail to log and notify supervisor of abnormal condition
C. Log readings, test safety controls, maintain proper superheat/subcooling per manufacturer
D. Continue operating with bypassed safety controls
Answer: C
Rationale: Selected answer aligns with FDNY Z-51 study guide, NYC Fire Code, and industry best practices
for operating engineers. It covers system components, operating pressures, temperatures,
superheat/subcooling calculations, and emergency shutdown. It demonstrates NGN-style clinical judgment by
prioritizing assessments, recognizing unsafe conditions, and implementing corrective actions. Alternatives
represent dangerous practices like operating with bypassed safeties or inadequate ventilation. Critical for
passing COF exam. Focus: fire code compliance.
, 4. Per NYC Fire Code, a refrigerating system using Group A1 refrigerant exceeding 100 lbs
requires This is NGN-style scenario requiring FDNY Z-51 COF RSOE Q-01 judgment. The
operating engineer must apply NYC Fire Code and safe refrigeration practices. What is the
most appropriate action per 2026/2027 code?
A. Operate compressor with low oil pressure
B. Enter machinery room without SCBA during ammonia leak
C. Ignore high pressure alarm and reset without investigation
D. Isolate leak, recover refrigerant per EPA 608, and repair per ASME B31.5
Answer: D
Rationale: Correct per FDNY Z-51 NYC Fire Code 2026, Certificate of Fitness for Refrigerating System
Operating Engineer, and RSOE Q-01 requirements. This addresses safe operation, refrigerant handling per
EPA 608, pressure vessel codes, and emergency procedures. It includes proper log keeping, safety controls
testing, and ventilation requirements for machinery rooms. Incorrect options violate Fire Code, ignore PSM, or
fail to protect life safety. Mastery is essential for COF and Q-01 licensure. Focus: emergency response.
5. NGN-style: The operating engineer notices high discharge pressure at 280 psig on R-134a
system. The most appropriate action is This is NGN-style scenario requiring FDNY Z-51 COF
RSOE Q-01 judgment. The operating engineer must apply NYC Fire Code and safe
refrigeration practices. What is the most appropriate action per 2026/2027 code?
A. Skip daily inspection and maintenance
B. Vent refrigerant to atmosphere violating EPA
C. Use open flame for leak detection
D. Log readings, test safety controls, maintain proper superheat/subcooling per manufacturer
Answer: D
Rationale: Selected answer aligns with FDNY Z-51 study guide, NYC Fire Code, and industry best practices
for operating engineers. It covers system components, operating pressures, temperatures,
superheat/subcooling calculations, and emergency shutdown. It demonstrates NGN-style clinical judgment by
prioritizing assessments, recognizing unsafe conditions, and implementing corrective actions. Alternatives
represent dangerous practices like operating with bypassed safeties or inadequate ventilation. Critical for
passing COF exam. Focus: fire code compliance.
6. Per NYC Fire Code, a refrigerating system using Group A1 refrigerant exceeding 100 lbs
requires This is NGN-style scenario requiring FDNY Z-51 COF RSOE Q-01 judgment. The
operating engineer must apply NYC Fire Code and safe refrigeration practices. What is the
most appropriate action per 2026/2027 code?
A. Shut down system, activate ventilation, notify FDNY, and don PPE per Emergency Action Plan
B. Operate compressor with low oil pressure
C. Vent refrigerant to atmosphere violating EPA
D. Continue operating with bypassed safety controls
Answer: A
Rationale: Selected answer aligns with FDNY Z-51 study guide, NYC Fire Code, and industry best practices
for operating engineers. It covers system components, operating pressures, temperatures,
superheat/subcooling calculations, and emergency shutdown. It demonstrates NGN-style clinical judgment by
prioritizing assessments, recognizing unsafe conditions, and implementing corrective actions. Alternatives
represent dangerous practices like operating with bypassed safeties or inadequate ventilation. Critical for
passing COF exam. Focus: fire code compliance.
