HVAC Technical Training

What this program prepares you to judge

• Isolate and prove dead before any meter work — every call, every time
• Read VAC, VDC, current and resistance against the rating plate, not memory
• Discharge and test capacitors out of circuit, never energized
• Read a ladder diagram to the single next test
• Prove airflow and the nameplate before any charge decision
• Prove the thermostat call at the board before condemning the stat

Curriculum

• Electrical fundamentals and multimeter mastery

  Isolate before the meter, read VAC and VDC with intent, take current and resistance without creating a fault, handle capacitors dead and discharged, and read a simple schematic to the next test.

• Airflow and duct basics

  Static pressure vs airflow vs 'just add charge', proving air through the filter, coil and blower before the gauges come out, and reading what a frozen coil is actually telling you.

• Heat pump diagnostics

  Heat mode vs cool mode and the reversing valve, normal defrost vs a real fault, and recognising when the backup heat is quietly carrying the house.

• Gas heat diagnostics

  Combustion air and carbon monoxide discipline, the ignition sequence proven step by step before any board is condemned, and the exchanger / rollout / pressure-switch tests that come before parts.

• Refrigeration and charging

  Airflow and the nameplate before any charge decision, superheat and subcooling read against the metering device, and overcharge vs undercharge vs restriction vs airflow separated by the next test — not by guesswork.

• Thermostats and controls

  Prove the call before condemning the stat, read R C Y G W at the board where the truth lives, and never put a jumper on a communicating bus.

• Walk-in method: box before refrigeration

  Prove the box — door, evaporator, defrost, drain — before you touch the refrigeration side, keep isolation and recovery discipline on a charged walk-in, and run the not-holding-temp playbook in order.

• Ice machines: freeze, harvest, and the halves of the cycle

  Split the call at harvest vs freeze, prove water, condenser and the bin/harvest controls before any board, and work a no-ice call to a confirmed cause.

• Defrost systems and TXV superheat / subcooling

  Electric vs hot-gas defrost and what 'won't defrost' is not, then superheat and subcooling on a TXV walk-in — restriction vs overcharge vs low air, proven by the next test.

• Reach-in method: box, load and coil before the sealed system

  Diagnose a warm reach-in or prep table in order — door and load, evaporator ice and airflow, then coil vs restriction vs charge — with recovery and isolation discipline on a charged box.

• Refrigerant hazards: A2L, hydrocarbon and CO2 stop decisions

  Recognise A2L, R-290 and R-744 on a commercial call, apply the flammability and high-pressure rules before you open anything, and know exactly where the job stops and escalates.

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