Lesson 1Electrical requirements: dedicated circuit, wire sizing, disconnect, grounding, surge protectionOutlines electrical needs for safe split AC installs. Covers dedicated lines, breaker sizes, wire gauges, disconnect spots, grounding, surge guards, and labels for service in Eritrean sites.
Dedicated circuit and breaker sizeWire gauge and insulation typeOutdoor disconnect place and ratingGrounding and bonding equipmentSurge protection and labelsLesson 2Evacuation and pressure testing: vacuum pump use, micron gauge procedure, nitrogen pressure checks and leak detection methodsDetails steps to evacuate and test pressure for dry, leak-free systems. Includes nitrogen tests, soap and electronic leak finds, deep vacuum goals, micron checks, decay tests, and recording results.
Nitrogen pressure test stepsSoap bubble and electronic leaksVacuum pump setup and hosesMicron gauge goals and decay testRecord final test outcomesLesson 3Mounting systems: wall bracket selection, anchor types, and structural considerationsHow to pick and fit mounting for indoor and outdoor units safely. Covers brackets, anchors for walls, load math, rust resistance, and vibration noise control in Eritrea.
Wall brackets and stands choiceAnchor types for materialsLoad rating and safety factorsRust resistance and coatingsVibration and noise controlLesson 4Indoor unit siting: ideal height, clearance, airflow patterns, avoiding heat sources and sunlightChoose best indoor spot for comfort, efficiency, and access. Covers height, clearances, air paths, noise, avoiding heat, sun, and blocks in Eritrean rooms.
Mounting height rangesSide and top clearance minsAvoid heat sources and sunAirflow patterns and reachNoise, drafts, comfortLesson 5Outdoor unit placement: stable pad, clearance for airflow, noise considerations and vibration isolationSelect and prep outdoor spot for stable, quiet, efficient run. Covers pads, anchoring, service space, air paths, snow debris issues, vibration noise control in Eritrea.
Pad choice and level fitService and airflow clearancesAvoid recirculation blocksNoise on neighbors indoorsVibration isolation padsLesson 6Drain line routing and trap design to prevent siphoning and odorsDesign and route condensate drains to stop leaks, siphoning, smells. Covers gravity vs pump, trap sizes, venting, slope, cleanouts, ends meeting code and clean needs.
Gravity drain vs pump choiceSlope and support spacingTrap size and place rulesVenting to stop siphoningCleanouts and drain endsLesson 7Connection techniques: flaring vs brazing copper, use of access valves, flare torque specs and leak-prevention practicesMethods to join copper lines leak-free. Compares flaring and brazing, when to use each, flare prep, torque specs, nitrogen purge in brazing, leak prevention tips.
Flaring vs brazing timesCopper tube prep and deburrFlare nut torque and toolsNitrogen purge in brazingLeak prevention checksLesson 8Startup checklist and commissioning: opening service valves, superheat/subcooling checks, system balancing and test runFull startup and commissioning after install. Includes valve opening, airflow check, superheat subcooling, balancing air, test in cool heat, document readings.
Pre-start visual leak checksSafe service valve openingMeasure superheat subcoolingBalance indoor air dampersTest run, log data, sign-offLesson 9On-site safety protocols: electrical lockout/tagout, ladder and fall safety, PPE for cutting/brazing, fire watch and hot work permitsKey safety rules on site before and during install. Covers electrical lockout, ladder setup, fall guard, PPE for cut braze, fire watch, hot work permits on client sites in Eritrea.
Lockout/tagout for AC circuitsLadder setup and fall guardPPE for cutting brazingFire watch roles durationHot work permits recordsLesson 10Refrigerant piping: piping length limits, elevation differences, proper slope for drain and refrigerant oil returnLayout refrigerant pipes for performance and compressor life. Covers length lift limits, sizing, oil return slope, avoid traps kinks, insulate, support to stop vibration.
Max line length lift limitsLine sizing from chartsOil return slope trap spotsInsulate suction liquid linesSupport secure line sets
