Lesson 1Indoor Unit Mounting: Placement Heights, Refrigerant Line Chase Entry, Drip Tray OrientationCorrect positioning of indoor units for comfort, service access, and drainage. Details on routing line sets, wall penetrations, and orienting drip trays to avoid leaks, noise, and ongoing maintenance problems.
Select optimal wall and mounting heightPlan refrigerant line chase and routingDrill and seal wall penetrationsSet and level indoor mounting plateOrient and test condensate drip trayLesson 2Electrical Connections, Phase Checks, and Safety Interlocks Prior to EnergisingSafe electrical terminations, conductor sizing, and grounding procedures. Includes checking phase rotation, control wiring, and confirming safety interlocks before powering up the split system.
Verify supply voltage and breaker sizeTerminate power and ground conductorsConnect control and communication wiringCheck phase rotation on three-phase unitsTest safety interlocks and fusesLesson 3Documenting Settings and Handing Over Basic Operation Notes to OwnerDocument final settings, control parameters, and test outcomes. Prepare handover notes for owners, including simple operating instructions and maintenance reminders for professional completion.
Record final control and timer settingsLog pressures, temperatures, and testsCreate basic user operation guideExplain filter cleaning and maintenanceObtain owner sign-off and warranty docsLesson 4Vacuuming and Evacuation: Pump Selection, Target Vacuum Level, Moisture Removal ProceduresGuide on selecting pumps, setting up hoses, and reaching target vacuum levels. Stress deep evacuation, removing moisture, using micron gauges, and decay tests to verify system dryness and seal integrity.
Select appropriate vacuum pump sizeConnect hoses and core removal toolsPull vacuum to target micron levelPerform standing vacuum decay testRecognize signs of moisture or leaksLesson 5Leak Detection and Pressure Testing: Dry Nitrogen Pressure Test, Electronic Leak Detector UsePressurise with dry nitrogen, isolate sections, and watch for pressure decay. Learn safe use of regulators, soap solution methods, and electronic detectors for thorough leak checks.
Set up nitrogen cylinder and regulatorPressurize system to test pressure limitsCheck joints with soap solutionUse electronic leak detector correctlyRecord test pressure and durationLesson 6Wall Bracket and Mounting Frame Installation: Levelling, Anchor Selection for Masonry or Stud WallsInstall wall brackets and frames for firm support. Focus on levelling, choosing anchors for masonry or stud walls, load paths, corrosion protection, and testing for pull-out strength and stability.
Assess wall type and load capacityChoose anchors for masonry or studsMark, drill, and clean anchor holesLevel brackets and tighten fastenersVerify bracket alignment and rigidityLesson 7Start-Up Sequence and Commissioning Checks: Superheat/Subcooling Measurement, Stable Temperature Verification, Drainage Test, Noise and Vibration ChecksInitial startup process, including mode selection, measuring superheat and subcooling, and confirming temperature stability. Also includes testing drainage, evaluating noise, and checking vibrations.
Follow manufacturer start-up sequenceMeasure superheat and subcoolingVerify supply and return temperaturesTest condensate drainage performanceAssess operating noise and vibrationLesson 8Site Preparation and Pre-Installation Checks: Tools, Permits, Clearances, Materials ChecklistEnsure site readiness before starting, with tool selection, permit checks, and safe clearances. Create a materials checklist to prevent delays and guarantee compliant, efficient installation work.
Verify site access and work area safetyConfirm permits, codes, and utility locationsCheck indoor and outdoor unit clearancesPrepare complete tools and materials listInspect structure for mounting suitabilityLesson 9Outdoor Unit Installation: Base Pad or Brackets on Exterior Wall, Anti-Vibration Pads, Clearance and Airflow DistancesPlace outdoor units on base pads or wall brackets, considering clearances, airflow, vibration control, and service access. Account for snow, flooding, and noise for sustained reliability in Eritrean conditions.
Select base pad or wall bracket systemSet required service and airflow clearancesInstall and position anti-vibration padsLevel unit and secure to supportsPlan for drainage, snow, and floodingLesson 10Refrigerant Line Installation: Cutting, Deburring, Bending, Flare versus Brazing Workflow, Torque and Sealing PracticesCut, deburr, and bend copper lines without kinks. Compare flaring and brazing processes, torque specifications, and sealing to achieve leak-proof, compliant refrigerant piping installations.
Measure, cut, and deburr copper tubingUse bending tools to avoid kinksPrepare and form accurate flaresApply torque to flare nuts correctlyInsulate and support line sets properlyLesson 11Opening Service Valves, Refrigerant Release Procedure and Handling Captive Refrigerant SystemsOpen service valves and release factory refrigerant charge without contaminants. Handle captive systems, valve stems, and record final operating pressures for proper system startup.
Identify service valves and capsBackseat and crack valves correctlyRelease captive refrigerant safelyCheck for leaks after opening valvesRecord operating pressures and temps
