Red Seal Refrigeration & AC Mechanic study plan

Explain how a basic vapour-compression cycle moves heat, naming the state of refrigerant at each of the four component outlets

Read and sketch a ladder diagram for a single-phase compressor circuit with a thermostat, contactor coil, and overload

Identify the terminals and internal components of a hermetic compressor motor from a wiring diagram

Calculate superheat and subcooling from gauge and thermometer readings on a practice problem set

State the lockout/tagout and PPE requirements that apply before opening a control panel

Trace a control circuit fault through a schematic to locate an open switch, and describe how to confirm it with a meter

Explain the operating sequence and failure symptoms of a potential relay and a current relay on a single-phase compressor

Test a run capacitor and a start capacitor and decide pass/fail against rated microfarads

Describe how to measure compressor winding resistance and insulation resistance and interpret the results

Diagram a three-phase motor reversing and protection arrangement used on a condensing unit

Build a systematic diagnostic sequence for a system that runs but does not cool, checking airflow, charge, and metering device in order

Interpret a pressure-temperature chart to convert gauge readings to saturation temperatures for at least three common refrigerants

Diagnose restricted liquid line, restricted suction line, and overcharge from pressure and temperature symptoms

Explain how a TXV, a fixed orifice, and a capillary tube each respond to changing load

Describe how to evaluate compressor efficiency using suction and discharge pressures and amp draw

Explain the difference between recovery, recycling, and reclamation and state which one a technician may perform on site

Describe the procedure and equipment for recovering refrigerant from a system into a recovery cylinder, including liquid and vapour recovery

Identify the safety hazards of refrigerant exposure, oxygen displacement, and frostbite, and the controls for each

Explain refrigerant cylinder handling, filling limits, hydrostatic testing, and safe storage rules

State the environmental obligations for leak detection, record keeping, and preventing deliberate venting

Select the correct tubing, fittings, and brazing alloy for a given line size, material, and pressure application

Describe how to braze a joint with nitrogen purge and explain why the purge is required

Explain line sizing, oil return, and trap requirements for a remote condensing unit with a vertical riser

List the commissioning steps for evacuating, leak testing, and charging a new split system in the correct order

Describe how to set and verify a superheat or subcooling target at start-up for a TXV and a fixed orifice system

Use a psychrometric chart to find dew point, wet-bulb, and enthalpy from dry-bulb and relative humidity readings

Explain how airflow, static pressure, and duct design affect evaporator performance and sensible heat ratio

Describe how to measure external static pressure and total airflow and compare against equipment ratings

Select and safely use the tools for a given task: vacuum gauge, micron gauge, manometer, anemometer, and clamp meter

Explain calibration checks and care for gauges, thermometers, and electronic leak detectors

Describe the operating sequence and controls of a commercial walk-in cooler and freezer, including defrost termination and fan delay

Explain how a parallel rack, a receiver, and an EPR valve interact in a supermarket refrigeration system

Diagnose ice build-up, short cycling, and product temperature problems in a walk-in system

Explain the purpose and adjustment of a head pressure control valve in low-ambient operation

Describe preventive maintenance tasks and intervals for a commercial refrigeration system

Complete a timed 100-question practice exam across all domains and score each domain separately

Review every missed question and write the underlying principle it tested

Re-drill the two weakest domains with focused problem sets

Recite the safety and environmental rules that most often appear in exam scenarios

Build a one-page formula and reference sheet for the exam day