Refrigeration and Air Conditioning Mechanic Red Seal Certification

Reciprocating, scroll, screw, and rotary compressors including hermetic, semi-hermetic, and open-drive designs.

TXV operation, capillary tubes, electronic expansion valves, and proper superheat settings for each device type.

Evaporator types, condenser design, approach temperature, flooded systems, and defrost methods.

Refrigerant types, ODP, GWP, azeotropic and zeotropic blends, temperature glide, and charging methods.

Filter driers, sight glasses, receivers, accumulators, oil separators, solenoid valves, and check valves.

Compressor oils, oil return, crankcase heaters, oil logging, oil separators, and oil level regulators.

Diagnosing high/low pressure conditions, restricted lines, non-condensables, and using gauges and instruments.

Refrigeration piping design, brazing with nitrogen, evacuation, leak detection, and charging procedures.

Heat pumps, cascade systems, compound systems, ammonia systems, CO2 transcritical, and Canadian regulations.