BTEB Refrigeration & AC Exam study plan

Define pressure, temperature, enthalpy, and entropy and state the unit of each in both SI and imperial terms

Explain the vapour-compression cycle stage by stage and identify where each stage sits on a pressure-enthalpy diagram

Compute refrigeration effect, compressor work, and coefficient of performance from given enthalpy values

Distinguish sensible from latent heat and calculate each for a stated mass of refrigerant or air

Compare the four common refrigerants by boiling point, latent heat, and safety group and justify a selection for a stated application

Trace refrigerant and oil flow through compressor, condenser, expansion device, and evaporator and describe the state change at each

Classify compressors, condensers, evaporators, and metering devices by construction and state one installation constraint for each

Explain how superheat and subcooling are produced and what each protects or improves

Interpret a simple system schematic and mark the high side, low side, and every accessory in its correct position

Describe the function of filter-driers, accumulators, receivers, oil separators, and sight glasses and state the symptom of each failing

Explain capacity control methods for compressors and evaporators and match each to a load profile

Calculate superheat and subcooling from given suction and liquid line readings

Explain dry-bulb, wet-bulb, dew point, and relative humidity and read them from a psychrometric chart

Plot a sensible heating and a cooling-and-dehumidifying process on a psychrometric chart and read the resulting coil conditions

Compute sensible, latent, and total cooling loads for a stated room using the load components

Distinguish conduction, solar, internal, infiltration, and ventilation loads and state which dominates in a stated case

Size a room air conditioner from a completed load calculation and justify the selected tonnage against the computed load

Select equipment type (split, packaged, chilled water) for stated building and occupancy conditions with a written rationale

Compute air quantity from sensible and latent load using the standard airflow equations

Explain duct sizing by equal friction and velocity methods and state the consequence of undersizing

Sequence the installation steps for a split system from placement through piping, evacuation, and charging

Explain evacuation and leak testing procedures and state the target vacuum and hold time

Describe charging by weight, superheat, and subcooling and state which method suits which metering device

List the commissioning checks performed on airflow, refrigerant charge, electrical supply, and controls before handover

Diagnose high suction pressure, low suction pressure, high head pressure, and low head pressure from a set of gauge and temperature readings

Interpret superheat and subcooling values as diagnostic evidence and state the fault each pattern suggests

Describe the safe handling, recovery, and storage requirements for refrigerants and the personal protective equipment required

Identify electrical and mechanical hazards in servicing and state the lockout and isolation steps for each

Review all five domains using the week-1 to week-7 deliverables as a condensed revision set

Solve timed mixed-domain problem sets and score each attempt against the answer key

Re-teach the two weakest topics in writing without notes to confirm retention

Simulate a full-length practice paper under exam timing and review every error