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Technical Programs » HVAC-R


The Heating, Ventilation and Air Conditioning program at Pathfinder prepares students for one of the fastest growing and demanding technical trades. The HVAC workforce has over 27,000 workers projected to retire annually, and only 15,000 trained technicians are entering the workforce annually.

Freshman Year
  • Proper and safe operation of all hand
  • Tools and test equipment.
  • Preparing copper tubing and fittings.
  • Preparing iron pipe and fittings.
  • Basic electricity:
  • Parallel and series circuits
  • Diagrams as applied to HVAC
  • Oil burner types; construction.
  • Components and functions.
  • Oil fired warm air furnaces.
  • Venting of combustion gasses.
  • Combustion efficiency.
  • Temperature pressure relationships.
  • Basic Air Conditioning/Refrigeration.
  • Recovery, evacuation and leak checking.

Sophomore Year
  • Motors, thermostats, transformers, relays and switches.
  • Charging of refrigeration and air conditioning systems.
  • Troubleshooting of refrigeration and air conditioning systems.
  • System specific air conditioning circuits.
  • Psychometrics.
  • Section 608 and 609 recovery test preparation.
  • Refrigerants.
  • Gas burners and components; low voltage and millivolt systems.
  • Mid and high efficiency gas fired furnaces and boilers.

Junior Year
  • Split A/C systems installation and troubleshooting.
  • Advanced heating and air conditioning wiring diagrams.
  • Programmable thermostats.
  • Oil fired hydronic heating systems.
  • Zoning hydronic heating systems.
  • Applied hydronic piping diagrams.
  • Commercial refrigerant flow controls accessories and application.
  • Heat pumps components and operation.

Senior Year
  • Commercial refrigeration systems and associated electrical diagrams.
  • Commercial refrigeration pipe sizing and design.
  • Supermarket refrigeration.
  • Ice machines - flakers and cuber.
  • Heat gain/loss.
  • Duct design.
  • NEFI (New England Fuel Institute) and Mass oil code test prep.
  • Domestic refrigerators and applied circuitry: Starting circuits, defrost circuits and compressors.
Schley Warren
Department Head
Marisz Zielinksi