HVAC Excellence Refrigeration study plan
HVAC Excellence Refrigeration · Give each week a clear focus.
8 weeks · About 6 hours per week
Refrigeration Fundamentals & Refrigerants and Lubricants
Draw and label a complete vapor-compression cycle from memory, marking pressure, temperature, and phase at each of the four state points
Calculate superheat, subcooling, and compression ratio from a set of given gauge and line-temperature readings
Explain the pressure-temperature relationship for at least three common refrigerants and locate saturation points on a PT chart without assistance
Define the four refrigerant safety classifications (A1, A2L, B1, B2L) and state one application consequence of each
Your checkpoint
A one-page hand-drawn cycle diagram with worked superheat, subcooling, and compression-ratio calculations attached, self-graded against a reference chart
Refrigerants and Lubricants & Refrigeration Fundamentals
Compare the properties, glide, and oil compatibility of at least five current refrigerants (including an HFC, an HFO blend, and a natural refrigerant)
Identify which lubricant types (mineral, POE, PAG, PVE) pair with which refrigerant families and explain the moisture risk for each
Describe safe refrigerant handling, recovery, and cylinder procedures for a given service scenario
Explain fractionation and temperature glide and predict how a blend behaves during a leak and recharge
Your checkpoint
A refrigerant-to-lubricant compatibility matrix covering at least eight refrigerants, with glide values and a short note on charging method (liquid vs. vapor) for each
System Components & Refrigeration Fundamentals
Trace refrigerant and electrical paths through a complete system and label every major component's function
Explain the operation and failure modes of compressors, metering devices (TXV, EEV, cap tube, orifice), and heat exchangers
Describe the role and test procedure for each accessory: filter-drier, accumulator, receiver, sight glass, and oil separator
Match a described system symptom to the component most likely responsible, with reasoning
Your checkpoint
An annotated system schematic labeling at least 15 components with a one-sentence function and one common failure mode for each
System Components & Installation and Commissioning
Sequence the steps of a new system installation from rigging through evacuation and charging
Calculate required line sizes, airflow, and charge for a described residential application
Perform a nitrogen pressure test and a triple evacuation plan on paper, including target microns and hold times
Verify a completed installation against commissioning checkpoints (superheat/subcooling, static pressure, amp draw, delta-T)
Your checkpoint
A written commissioning checklist for a hypothetical split-system install with target values filled in and a signed-off pass/fail column
Installation and Commissioning & Troubleshooting and Service
Diagnose at least six fault scenarios (restriction, overcharge, undercharge, bad TXV, dirty condenser, low airflow) from a table of pressures, temperatures, and amp readings
Explain how each fault shifts superheat, subcooling, and compression ratio and predict the direction of change
Describe proper recovery, evacuation, and leak-detection procedures for a service call
Apply electrical troubleshooting logic to a compressor that will not start (start components, capacitors, windings, contactor)
Your checkpoint
A fault-diagnosis reference table mapping at least eight symptoms to likely causes, confirming measurements, and corrective actions
Troubleshooting and Service & Refrigerants and Lubricants
Walk through a systematic troubleshooting sequence from complaint to verified repair for three realistic service calls
Interpret refrigerant contamination, moisture, and acid test results and specify corrective action
Explain compressor failure analysis: burnout cleanup, acid removal, and when to replace the filter-drier
Identify when a refrigerant retrofit or replacement is appropriate and list the required steps
Your checkpoint
Three written case studies (complaint, measurements, diagnosis, repair, verification) each at least 150 words, with a peer or self-review note
Refrigeration Fundamentals & Refrigerants and Lubricants & System Components & Installation and Commissioning & Troubleshooting and Service
Complete a timed 60-question mixed-domain practice set and score each domain separately
Re-study the two weakest domains using targeted notes and worked examples
Re-derive the five most-missed concepts from first principles without notes
Build a one-page formula and reference sheet covering the whole exam scope
Your checkpoint
A scored practice exam with a per-domain breakdown and a written remediation plan for the two lowest-scoring domains
Troubleshooting and Service & Installation and Commissioning & Refrigeration Fundamentals
Complete two full-length timed practice exams under exam conditions and review every missed item
Recite the troubleshooting decision tree and commissioning checkpoints from memory
Drill weak-area flashcards until 90% accuracy is reached on two consecutive passes
Finalize test-day logistics and a last-24-hour review schedule
Your checkpoint
A final readiness report listing practice-exam scores, remaining weak areas, and a signed statement that all domain targets were met
Milestones
Week 2: Can explain the vapor-compression cycle, PT relationships, and refrigerant/lubricant pairings without notes; score at least 80% on a self-made 20-question fundamentals and refrigerants quiz
Week 4: Can label every major component on a blank schematic and write a complete installation and commissioning sequence from memory; score at least 80% on a components and installation quiz
Week 6: Can diagnose six fault scenarios from a readings table with correct reasoning and state the confirming measurement for each; score at least 80% on a troubleshooting quiz
Week 8: Two full-length timed practice exams completed with a combined average of at least 85% and no single domain below 75%