Installs and services commercial refrigeration: racks, low-temperature systems, regulators, defrost and three-phase power.

Usually from a shop of about 3. 61 required, 12 recommended and 50 elective skills in 4 stages.

Beyond residential

Stages follow the tiers: Foundation, then Core, then Advanced. Skills inside a stage are in learning order.

Stage 1 · Foundation

23 required · 3 recommended · 4 elective

Required

1. PPE and jobsite hazards Foundation & Safety Safety-critical
2. Ladders and fall protection Foundation & Safety Safety-critical
3. Lockout / tagout Foundation & Safety Safety-critical
4. Emergency first aid Foundation & Safety Safety-critical
5. Refrigerant and nitrogen handling safety Foundation & Safety Safety-critical
6. Heat, matter and pressure Foundation & Safety
7. Hand tools and instruments orientation Foundation & Safety
8. Trade math basics Foundation & Safety
9. Measurement and unit conversion Foundation & Safety
10. Industry orientation Foundation & Safety
11. Efficiency ratings literacy Foundation & Safety
12. Electrical shock and burn prevention Electrical & Controls Safety-critical
13. Electricity and circuit laws Electrical & Controls
14. Series, parallel and combination circuits Electrical & Controls
15. Conductors, insulators and circuit protection Electrical & Controls
16. Using electrical meters Electrical & Controls
17. Refrigeration cycle basics Refrigeration Circuit
18. Saturation tables and P/T charts Refrigeration Circuit
19. Refrigerant piping basics Refrigeration Circuit
20. Line set insulation and support Refrigeration Circuit
21. Gauges and service valves Refrigeration Circuit
22. Condensate drain installation Cooling & Heat Pumps
23. Customer communication fundamentals Business & Leadership

Recommended

1. Airflow fundamentals Airflow & Ducts
2. Airflow measuring tools Airflow & Ducts
3. Carbon monoxide safety Heating Safety-critical

Elective

1. Duct insulation Airflow & Ducts
2. Combustion fundamentals Heating
3. Furnace configurations and components Heating
4. Electric heat fundamentals Heating

Stage 2 · Core

25 required · 4 recommended · 28 elective

Required

1. Rigging, hot work and confined spaces Foundation & Safety Safety-critical
2. Reading wiring diagrams Electrical & Controls
3. Transformers and control voltage Electrical & Controls
4. Run and start capacitors Electrical & Controls
5. Single-phase motors Electrical & Controls
6. Contactors, relays and solenoids Electrical & Controls
7. Sensors and thermistors Electrical & Controls
8. Refrigerant types and blends Refrigeration Circuit
9. Compressors and oils Refrigeration Circuit
10. Condensers and evaporators Refrigeration Circuit
11. Metering devices Refrigeration Circuit
12. Line components and pressure controls Refrigeration Circuit
13. Nitrogen purge and pressure testing Refrigeration Circuit
14. Brazing and soldering Refrigeration Circuit
15. System evacuation Refrigeration Circuit
16. Charging by weight Refrigeration Circuit
17. Superheat and subcooling Refrigeration Circuit
18. Leak detection Refrigeration Circuit
19. Recovery, recycling and reclaim Refrigeration Circuit Safety-critical
20. A2L refrigerant fundamentals Refrigeration Circuit Safety-critical
21. Power and amperage commissioning checks Cooling & Heat Pumps
22. Manual J load calculation Design & Commissioning
23. Manual S equipment selection Design & Commissioning
24. Systematic troubleshooting method Design & Commissioning
25. Commercial refrigeration fundamentals Commercial & BAS

Recommended

1. Outdoor and package unit installation Cooling & Heat Pumps
2. Wireless probes and diagnostic apps Design & Commissioning
3. Rooftop and VAV systems Commercial & BAS
4. Preventive maintenance programs Commercial & BAS

Elective

1. Conventional thermostat wiring Electrical & Controls
2. Measuring static pressure Airflow & Ducts
3. Measuring total system airflow Airflow & Ducts
4. Airflow for capacity Airflow & Ducts
5. Sheet metal fabrication Airflow & Ducts
6. Duct board and flex duct installation Airflow & Ducts
7. Duct routing and support Airflow & Ducts
8. Duct sealing and leakage testing Airflow & Ducts
9. Blower setup and speed adjustment Airflow & Ducts
10. Belt-drive blower maintenance Airflow & Ducts
11. Gas valves and burners Heating
12. Ignition and flame proving Heating
13. Gas pressure, input and derating Heating
14. Venting systems Heating Safety-critical
15. Gas piping Heating Safety-critical
16. Temperature rise and furnace airflow Heating
17. Oil burner fundamentals Heating
18. Electric heat service and installation Heating
19. Indoor equipment installation Cooling & Heat Pumps
20. Heat pump cycle and reversing valve Cooling & Heat Pumps
21. Defrost controls Cooling & Heat Pumps
22. Heat pump thermostats and auxiliary heat Cooling & Heat Pumps
23. Heat pump charging Cooling & Heat Pumps
24. Heat pump types and selection Cooling & Heat Pumps
25. Ductless mini-split installation Cooling & Heat Pumps
26. Commissioning fundamentals Design & Commissioning
27. DDC and control theory Commercial & BAS
28. Inventory and warehouse management Business & Leadership

Stage 3 · Advanced

12 required · 5 recommended · 17 elective

Required

1. Electrical troubleshooting Electrical & Controls
2. Charging blends and manufacturer methods Refrigeration Circuit
3. Refrigerant charge diagnostics Refrigeration Circuit
4. Compressor efficiency and failure analysis Refrigeration Circuit
5. A2L installation and service Refrigeration Circuit Safety-critical
6. Manual D duct design Design & Commissioning
7. Manual T air distribution Design & Commissioning
8. Refrigerant line sizing Design & Commissioning
9. Commercial AC controls and safeties Commercial & BAS
10. Refrigeration regulators and controls Commercial & BAS
11. Low-temperature system installation Commercial & BAS
12. Three-phase motors and power Commercial & BAS

Recommended

1. ECM and variable-speed motors Electrical & Controls
2. Residential AC troubleshooting Cooling & Heat Pumps
3. Fault codes and board-level diagnostics Design & Commissioning
4. Chilled water and cooling towers Commercial & BAS
5. VFDs and commercial wiring Commercial & BAS

Elective

1. Communicating and smart thermostats Electrical & Controls
2. Panel capacity for electrification Electrical & Controls
3. Air balancing Airflow & Ducts
4. Combustion analysis Heating
5. Gas furnace troubleshooting Heating
6. Oil furnace setup and tuning Heating
7. Variable-speed systems Cooling & Heat Pumps
8. Multi-zone mini-split charging and service Cooling & Heat Pumps
9. Cold-climate heat pump performance Cooling & Heat Pumps
10. Dual-fuel systems Cooling & Heat Pumps
11. Heat pump troubleshooting Cooling & Heat Pumps
12. Heat pump sizing strategies Design & Commissioning
13. Total system performance verification Design & Commissioning
14. Existing system performance optimisation Design & Commissioning
15. Commercial prints and sequences of operation Commercial & BAS
16. BAS networks and protocols Commercial & BAS
17. Controllers, sensors and actuators Commercial & BAS

Stage 4 · Specialist

1 required · 1 elective

Required

1. Multiple compressor and evaporator systems Commercial & BAS

Elective

1. BAS programming and configuration Commercial & BAS