Lesson 1Pre-install checks: verifying unit model, matched components, refrigerant charge requirements, and tool listThis part covers checking indoor and outdoor unit matches, label data, coolant type and amount, site setup, and needed tools and gear before starting, to avoid redoing work, harm, and unsafe fits in local conditions.
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 note measured values, setup choices, and test outcomes, fill warranty and rule forms, and hand over to the owner, explaining controls, upkeep, and main limits in simple terms for Eritrea users.
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 part explains opening valves right, checking total coolant amount, measuring work pressures and pipe heats, and fixing for height and pipe length to keep inverter work within planned limits in highland areas.
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 covering refrigerant pipes, guiding and fixing the pipe set and control wire, clamping to cut mechanical pull, and guarding from sun, rubs, and shakes to keep efficiency and stop 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 linking manifolds and hoses, pulling deep vacuum, doing standing vacuum test, reading micron levels, and spotting leaks or wet issues before adding refrigerant to the inverter system safely.
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 part covers first start of the inverter system, checking current pull, work pressures, heat difference, superheat, subcooling, and looking for odd noise or shakes to confirm steady, good running.
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 designing and fitting water drains with right slope, trap needs, covering, and guiding to okay outlet or pump, stopping leaks, smells, and water harm during cooling and wet air removal.
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 part details readying the indoor mounting plate, marking layout, drilling true holes, fitting anchors, and checking flat and straight so the unit drains well, seals tight, and fights shakes long-term.
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 right copper pipe cutting, smoothing, flaring, and tightening, plus welding ways with nitrogen clean and flux use where needed, ensuring clean, no-leak joins for inverter coolant paths.
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 part explains safe linking to power board, breaker sizing, grounding, wire direction, and low-power control wiring for inverters, ensuring rule match, maker needs, and steady electronic work.
Confirm supply voltage and breaker sizingRoute and secure power cable to unitsEarth bonding and continuity checksIndoor-outdoor terminal block wiringVerify polarity and phase rotation
