Lesson 1Pre-install checks: verifying unit model, matched components, refrigerant charge requirements, and tool listThis section covers verifying indoor and outdoor unit compatibility, nameplate data, refrigerant type and charge, site conditions, and required tools and instruments before work begins, preventing rework, damage, and unsafe installations.
Confirm indoor and outdoor model compatibilityCheck nameplate voltage, phase, and frequencyVerify factory refrigerant type and base chargeAssess site conditions and mounting constraintsPrepare tools, PPE, and test instrumentsLesson 2Commissioning documentation: recording measurements, settings, and customer handover paperworkHere you will document measured values, configuration settings, and test results, complete warranty and regulatory forms, and perform customer handover, explaining controls, maintenance, and key operating limitations clearly.
Record electrical and refrigeration readingsNote configuration and control settingsAttach photos or digital test reportsComplete warranty and compliance formsExplain operation and maintenance to userLesson 3Opening service valves, initial charge verification, measuring pressures and temperatures, and adjusting for altitude/line lengthThis section explains opening service valves correctly, verifying total refrigerant charge, measuring operating pressures and line temperatures, and applying corrections for altitude and line length to keep inverter performance within design limits.
Sequence for cracking service valvesCheck for leaks at valve stemsCompare nameplate and line length dataMeasure operating pressures and tempsAdjust charge per manufacturer tablesLesson 4Insulating lines, securing lineset and electrical cable, and clamping to minimize stressHere we cover insulating refrigerant lines, routing and securing the lineset and control cable, clamping to reduce mechanical stress, and protecting against UV, abrasion, and vibration to maintain efficiency and prevent noise.
Select correct insulation thicknessInsulate suction and liquid lines fullyBundle lineset and control cable neatlyClamp and support to relieve strainProtect lines from UV and sharp edgesLesson 5Evacuation and leak test sequence: connecting gauges, vacuum pump operation, holding test, and interpreting micron readingsHere you will learn how to connect manifolds and hoses, pull a deep vacuum, perform a standing vacuum test, interpret micron readings, and identify leaks or moisture issues before releasing refrigerant into the inverter system.
Correct manifold and hose connectionsVacuum pump setup and oil conditionTarget vacuum level and pull-down timeStanding vacuum and rise test procedureInterpreting micron trends for leaksLesson 6Startup checks: amp draw, operating pressures, temperature split, refrigerant superheat/subcooling checks, listening for abnormal noise, and vibration assessmentThis section covers initial startup of the inverter system, including verifying amp draw, operating pressures, temperature split, superheat, subcooling, and checking for abnormal noise or vibration to confirm stable, efficient operation.
Pre-start visual and safety inspectionMonitor compressor and fan amp drawMeasure suction and discharge pressuresCheck supply-return temperature splitEvaluate noise, vibration, and airflowLesson 7Proper condensate drain installation: ensuring slope, trap formation (if required), and routing to approved discharge or pumpYou will learn how to design and install condensate drains with proper slope, trap requirements, insulation, and routing to an approved discharge or pump, preventing leaks, odors, and water damage during cooling and dehumidification.
Determine drain outlet location and sizeSet continuous slope and support spacingTrap design for negative pressure unitsInsulate drain in humid environmentsTest drain flow and leak tightnessLesson 8Preparing mounting plate, drilling accurate holes, inserting anchors, and checking level and plumbThis section details preparing the indoor mounting plate, marking layout, drilling accurate holes, installing anchors, and checking level and plumb so the unit drains correctly, seals well, and resists vibration over long-term operation.
Mark plate position and clearancesLocate studs or solid fixing pointsDrill wall and sleeve penetration holesInstall anchors suited to wall materialVerify plate level, plumb, and rigidityLesson 9Making copper connections: cutting, flaring procedure step-by-step, or brazing technique including flux and purge with nitrogenYou will learn correct copper tube cutting, reaming, flaring, and torqueing, plus brazing techniques with nitrogen purging and proper flux use where applicable, ensuring clean, leak-free joints for inverter refrigerant circuits.
Select tubing size and cutting toolsDeburr and ream without contaminatingFlaring dimensions and tool setupTorque flare nuts to spec valuesNitrogen purge and brazing techniqueLesson 10Electrical hookup sequence: connecting to local panel, breaker installation, earth bonding, control wiring, and verifying polarityThis section explains safe connection to the supply panel, breaker sizing, grounding, polarity, and low-voltage control wiring for inverter systems, ensuring compliance with codes, manufacturer requirements, 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
