Lesson 1Start-up verification: temperature split checks, high/low pressure readings, current draw, vibration and noise inspectionGuide yuh through first start-up checks, includin temperature split, pressure readings, current draw, an inspection fi vibration an noise fi confirm correct installation an protect di compressor.
Stabilizin system before measurementsMeasure supply an return temperature splitRead suction an discharge pressuresMeasure compressor an fan current drawCheck vibration, noise, an panel fitLesson 2Refrigerant line routing and insulation: line-set lengths and height differences, drain routing and trap placement, insulation materials and thicknessCover best practices fi routin refrigerant lines an drains, managin line-set length an elevation, preventin oil traps, an selectin insulation materials an thickness fi avoid sweatin an capacity loss.
Plannin line-set paths an supportsManagin line length an height differenceAvoidin oil traps an sharp bendsDrain line slope, traps, an ventsInsulation material an thickness choicesLesson 3Site selection for outdoor unit: ventilation, noise setback, structural pad or bracket selection, service accessDescribe how fi choose an outdoor unit location wid adequate airflow, minimal noise impact, solid structural support, an safe, convenient service access fi long-term reliability an easy maintenance.
Clearance fi airflow an recirculationNoise, setback, an neighbor impactChoosin pads, brackets, or standsSnow, floodin, an debris concernsPlannin safe technician accessLesson 4Evacuation and vacuum targets: vacuum pump use, target vacuum level (microns), moisture removal rationale and hold testExplain evacuation theory an practice, includin pump setup, target micron levels, moisture removal, an standin vacuum tests fi verify system tightness before releasin refrigerant into di circuit.
Preparin manifold an hoses fi vacuumConnectin an sizin vacuum pumpTarget micron levels fi new installsPerformin standin vacuum hold testsCommon evacuation mistakes fi avoidLesson 5Line connections and joints: proper flare technique, brazing alternatives, wet vs dry connections, leak-prevention practicesDetail correct flare preparation, torquin, an alternatives such as braze joints. Emphasize cleanliness, moisture control, an proven leak-prevention practices fi long-term reliability a line connections.
Cuttin an deburrin copper tubinFormin accurate flares an swagesUsin torque wrenches pon flare nutsWhen fi choose braze connectionsUsin sealants an gaskets correctLesson 6Site selection for indoor unit: airflow, occupant comfort, food-product protection, mounting height and clearancesShow how fi select di best indoor unit location fi airflow, comfort, an product protection, considerin mountin height, clearances, obstructions, an potential sources a contamination or drafts.
Avoidin drafts pon occupants an bedsProtectin food an sensitive productsMountin height an ceilin distanceSide an bottom clearance needsAvoidin heat sources an sunlightLesson 7Mechanical mounting: indoor wall plate alignment, outdoor pad/bracket anchoring, anti-vibration considerationsCover mountin a indoor an outdoor components, includin wall plate alignment, condensate slope, pad or bracket anchorin, an anti-vibration measures fi reduce noise an prevent structural damage.
Locatin an levelin indoor wall plateAnchorin fi studs or solid masonryOutdoor pad levelin an anchorinBracket mountin pon walls or railsInstallin anti-vibration pads an feetLesson 8Electrical installation: circuit selection for 220V supply, disconnect and overcurrent protection sizing, grounding and control wiringFocus pon safe electrical installation fi 220V units, includin circuit selection, wire sizin, overcurrent protection, disconnect placement, groundin, an control wirin accordin fi codes an manufacturer data.
Determinin required circuit amperageSelectin wire gauge an insulationSizin breakers an fuses correctInstallin outdoor disconnect switchesGroundin an control wirin practicesLesson 9Pressure testing with dry nitrogen: test pressure selection, hold times, soap-test procedure for leak detectionExplain why dry nitrogen is use fi pressure testin, how fi choose safe test pressures, set realistic hold times, an apply soap solution correct fi locate leaks widout damagin system components.
Selectin safe nitrogen test pressuresSettin an monitorin pressure hold timesSoap-solution application techniquesInterpretin pressure drops an trendsDocumentin an taggin leak locationsLesson 10Charging and opening service valves: correct refrigerant charge process, measuring superheat/subcooling, final leak checkExplain how fi open service valves, verify factory charge, add or remove refrigerant when allow, an confirm charge usin superheat, subcoolin, an a final leak check before handin over di system.
Reviewin factory charge informationConnectin gauges an hoses safelyOpenin liquid an gas service valvesMeasure superheat an subcoolinPerformin final leak an soap tests
