Lesson 1Pre-fit checks: verifying unit model, matched parts, refrigerant charge needs, and tool listThis part covers verifying indoor and outdoor unit matching, label data, refrigerant type and charge, site conditions, and needed tools and instruments before starting, to avoid redoing, damage, and unsafe fittings.
Confirm indoor and outdoor model matchingCheck label voltage, phase, and frequencyVerify factory refrigerant type and base chargeCheck site conditions and mounting limitsPrepare tools, safety gear, and test instrumentsLesson 2Starting records: noting measurements, settings, and customer handover papersHere you will record measured values, setup settings, and test results, complete warranty and rule forms, and do customer handover, explaining controls, maintenance, and key operating limits clearly.
Record electrical and refrigeration readingsNote setup and control settingsAttach photos or digital test reportsComplete warranty and compliance formsExplain operation and maintenance to userLesson 3Opening service valves, initial charge check, measuring pressures and temperatures, and adjusting for height/line lengthThis part explains opening service valves right, verifying total refrigerant charge, measuring working pressures and line temperatures, and applying fixes for height and line length to keep inverter performance within design limits.
Steps for cracking service valvesCheck for leaks at valve stemsCompare label and line length dataMeasure working pressures and tempsAdjust charge per maker tablesLesson 4Insulating lines, securing lineset and electrical cable, and clamping to reduce stressHere we cover insulating refrigerant lines, routing and securing lineset and control cable, clamping to reduce mechanical stress, and protecting against UV, rubbing, and vibration to keep efficiency and stop noise.
Choose right insulation thicknessInsulate suction and liquid lines fullyBundle lineset and control cable neatlyClamp and support to ease strainProtect lines from UV and sharp edgesLesson 5Evacuation and leak test steps: connecting gauges, vacuum pump work, holding test, and reading micron valuesHere you will learn how to connect manifolds and hoses, pull deep vacuum, do standing vacuum test, read micron values, and spot leaks or moisture issues before releasing refrigerant into inverter system.
Right manifold and hose connectionsVacuum pump setup and oil conditionTarget vacuum level and pull-down timeStanding vacuum and rise test stepsReading micron trends for leaksLesson 6Start checks: amp draw, working pressures, temperature difference, refrigerant superheat/subcooling checks, listening for odd noise, and vibration checkThis part covers initial start of inverter system, including verifying amp draw, working pressures, temperature difference, superheat, subcooling, and checking for odd noise or vibration to confirm stable, efficient operation.
Pre-start visual and safety checkMonitor compressor and fan amp drawMeasure suction and discharge pressuresCheck supply-return temperature differenceEvaluate noise, vibration, and airflowLesson 7Proper condensate drain fitting: ensuring slope, trap making (if needed), and routing to approved discharge or pumpYou will learn how to plan and fit condensate drains with proper slope, trap needs, insulation, and routing to approved discharge or pump, stopping leaks, smells, and water damage during cooling and dehumidifying.
Find drain outlet spot and sizeSet continuous slope and support spacingTrap design for negative pressure unitsInsulate drain in humid areasTest drain flow and leak tightnessLesson 8Preparing mounting plate, drilling accurate holes, inserting anchors, and checking level and straightThis part details preparing indoor mounting plate, marking layout, drilling accurate holes, fitting anchors, and checking level and straight so unit drains right, seals well, and resists vibration over long time.
Mark plate spot and clearancesLocate studs or solid fixing pointsDrill wall and sleeve penetration holesFit anchors suited to wall materialVerify plate level, straight, and strengthLesson 9Making copper connections: cutting, flaring steps, or brazing technique including flux and purge with nitrogenYou will learn right copper tube cutting, reaming, flaring, and torqueing, plus brazing techniques with nitrogen purge and proper flux use where needed, ensuring clean, leak-free joints for inverter refrigerant circuits.
Choose tubing size and cutting toolsDeburr and ream without contaminatingFlaring sizes and tool setupTorque flare nuts to spec valuesNitrogen purge and brazing techniqueLesson 10Electrical connection steps: linking to local panel, breaker fitting, earth bonding, control wiring, and verifying polarityThis part explains safe link to supply panel, breaker sizing, earthing, polarity, and low-voltage control wiring for inverter systems, ensuring rule compliance, maker needs, and reliable electronic operation.
Confirm supply voltage and breaker sizingRoute and secure power cable to unitsEarth bonding and continuity checksIndoor-outdoor terminal block wiringVerify polarity and phase rotation
