Lesson 1Startup Checks: Temperature Difference Tests, High/Low Pressure Reads, Current Pull, Shake and Noise InspectionThis guides first startup checks, including temp differences, pressure reads, current pull, and looks for shake and noise to confirm right fitting and guard the compressor in local installs.
Settling system before measuresMeasuring supply and return temp splitReading suction and discharge pressuresMeasuring compressor and fan current pullChecking shake, noise, and panel fitLesson 2Routing Refrigerant Lines and Insulation: Line-Set Lengths and Height Gaps, Drain Paths and Trap Spots, Insulation Types and ThicknessThis covers top ways for routing refrigerant lines and drains, handling line-set length and height, stopping oil traps, and picking insulation types and thickness to avoid sweat and capacity loss.
Planning line-set paths and supportsHandling line length and height gapsAvoiding oil traps and sharp turnsDrain line slope, traps, and ventsInsulation type and thickness choicesLesson 3Picking Spot for Outdoor Unit: Airflow, Noise Distance, Structural Base or Bracket Choice, Service AccessThis describes choosing outdoor unit spots with good airflow, low noise effect, strong support, and safe, easy service access for lasting reliability and simple upkeep in Zambian sites.
Space for airflow and no recirculationNoise, distance, and neighbour effectsPicking bases, brackets, or standsSnow, flood, and rubbish concernsPlanning safe tech accessLesson 4Evacuating and Vacuum Goals: Using Vacuum Pumps, Target Vacuum Level (Microns), Why Remove Moisture and Hold TestThis explains evacuation basics and practice, including pump setup, target micron levels, moisture removal, and hold tests to check system seal before adding refrigerant.
Prepping manifold and hoses for vacuumLinking and sizing vacuum pumpsTarget micron levels for new fitsDoing standing vacuum hold testsCommon evacuation errors to dodgeLesson 5Line Links and Joints: Right Flare Method, Brazing Options, Wet vs Dry Links, Leak-Stop PracticesThis details proper flare prep, tightening, and options like brazed joints. It stresses cleanliness, moisture control, and proven leak-stop ways for long-term line link reliability.
Cutting and smoothing copper tubingMaking exact flares and swagesUsing torque wrenches on flare nutsWhen to pick brazed linksUsing sealants and gaskets rightLesson 6Picking Spot for Indoor Unit: Airflow, Comfort for People, Protecting Food Goods, Mount Height and ClearancesThis shows selecting best indoor unit spots for airflow, comfort, and goods protection, thinking about mount height, spaces, blocks, and possible dirt or draught sources.
Avoiding draughts on people and bedsProtecting food and sensitive goodsMount height and ceiling spaceSide and bottom space needsAvoiding heat sources and sunLesson 7Mechanical Mounting: Indoor Wall Plate Alignment, Outdoor Base/Bracket Fixing, Anti-Shake MeasuresThis covers mounting indoor and outdoor parts, including wall plate alignment, water slope, base or bracket fixing, and anti-shake steps to cut noise and stop structure harm.
Finding and levelling indoor wall plateFixing to studs or solid brickOutdoor base levelling and fixingBracket mounting on walls or railsFitting anti-shake pads and feetLesson 8Electrical Fitting: Circuit Choice for 220V Supply, Disconnect and Overcurrent Protection Sizing, Grounding and Control WiringThis focuses on safe electrical fitting for 220V units, including circuit picking, wire sizing, overcurrent protection, disconnect placing, grounding, and control wiring per codes and maker info.
Finding needed circuit ampsPicking wire gauge and insulationSizing breakers and fuses rightFitting outdoor disconnect switchesGrounding and control wiring waysLesson 9Pressure Testing with Dry Nitrogen: Test Pressure Choice, Hold Times, Soap-Test Steps for Leak FindingThis explains why use dry nitrogen for pressure tests, picking safe test pressures, setting hold times, and applying soap solution right to find leaks without harming parts.
Picking safe nitrogen test pressuresSetting and watching pressure hold timesSoap-solution applying tricksReading pressure drops and patternsRecording and marking leak spotsLesson 10Charging and Opening Service Valves: Right Refrigerant Charge Process, Measuring Superheat/Subcooling, Final Leak CheckThis explains opening service valves, checking factory charge, adding or removing refrigerant if okay, and confirming charge with superheat, subcooling, and final leak check before handover.
Reviewing factory charge infoLinking gauges and hoses safelyOpening liquid and gas service valvesMeasuring superheat and subcoolingDoing final leak and soap tests
