Lesson 1Two likely causes of floor-to-floor temperature differences: airflow imbalance (duct/vent, registers) and refrigerant or compressor performance issuesDis part explain di two main cause of floor to floor heat difference: air flow not balance from duct or register wahala, and problem with refrigerant or compressor wey reduce system power.
Identify symptoms of airflow imbalance by floorCheck for closed, blocked, or misdirected registersRecognize signs of low capacity or poor compressionRelate duct design limits to current building loadsDecide when imbalance needs design reviewLesson 2Confirming causes: airflow measurements, temperature splits, return air assessments, refrigerant charge checks (when qualified)Dis part show how to make sure root cause of comfort wahala with air flow read, heat split, return air check, and if you qualify, refrigerant level check, so data support fix or call contractor.
Measure supply and return airflow at key zonesCheck temperature split across evaporator coilAssess return air paths, blockages, and bypassesInterpret static pressure and fan performance dataCoordinate refrigerant checks with licensed staffLesson 3Safe tasks for technician: filter change, register balancing, condensate clearing, visual rooftop checksDis part define safe normal work for building technician, include change filter, balance register and vent, clear water drain, and look rooftop while follow safety and lockout rule.
Replace and label filters to building standardsAdjust supply registers and diffusers for balanceClear and test condensate pans, traps, and drainsPerform visual rooftop unit and curb inspectionsDocument findings and escalate issues appropriatelyLesson 4Initial rooftop unit checks: power, disconnect, visible refrigerant/oil leaks, condensate drainageDis part cover first check at rooftop unit when comfort complaint come, include check power and switch off, look for oil or refrigerant mark, and make sure water drain good and unit condition ok.
Verify main power, fuses, and disconnect positionInspect panels, gasketing, and unit anchoringLook for oil stains and refrigerant leak indicatorsCheck condensate pans, traps, and drain outletsNote unusual noises, vibration, or fan behaviorLesson 5Preventive maintenance schedule and best practices (filter frequency, seasonal tune-ups, condensate drain care)Dis part show preventive maintenance plan for rooftop unit and duct, include filter change time, season check-up, coil and drain care, and write record wey reduce break down and complaint.
Set filter change frequency by load and environmentPlan seasonal cooling and heating tune‑upsClean coils, drain pans, and traps routinelyInspect belts, bearings, and electrical terminationsMaintain detailed PM logs and service historyLesson 6Thermostat and control verification: setpoint checks, zoning conflicts, sensor placement and calibrationDis part focus on thermostat and control check, include set point, time table, zone fight, sensor place, and adjust so control wahala no look like machine or duct problem.
Confirm thermostat modes, setpoints, and schedulesCheck zoning dampers for proper responseEvaluate sensor placement and draft influencesPerform basic thermostat and sensor calibrationReview BAS trends for overrides and conflictsLesson 7Work requiring licensed HVAC contractor: refrigerant handling, compressor or coil replacement, major duct modifications, electrical motor replacementsDis part clear say which work only license HVAC man fit do, stress law need, refrigerant rule, big part change, and complex duct or electrical wey pass building technician limit.
Regulations for refrigerant recovery and chargingCompressor, condenser, and evaporator coil replacementMajor duct resizing, rerouting, or new trunk linesReplacement of condenser, blower, and VFD motorsPermits, inspections, and documentation needsLesson 8Post-repair validation: temperature mapping, airflow measurements, runtime and short-cycling checks, tenant comfort verificationDis part explain how to check say fix or adjust solve comfort wahala, use heat map, air flow check, run time look, and tenant talk to make sure stable work no short cycle or new unbalance.
Map temperatures by floor and representative zonesRecheck airflow and diffuser throw after changesMonitor runtimes and watch for short‑cyclingConfirm condensate drainage and coil conditionsGather tenant feedback and update service recordsLesson 9Basic routine checks: filter condition, blower operation, refrigerant pressures, compressor and fan motorsDis part show normal check technician do before deep find problem, focus on filter state, blower work, basic electrical check, and look refrigerant pressure without change unless qualify.
Inspect and document filter type and conditionVerify blower rotation, speed, and noise levelsCheck blower belts, pulleys, and motor mountsObserve suction and discharge pressures, no adjustmentsRecord nameplate data and compare to readingsLesson 10System overview: packaged rooftop unit components and common control schemesDis part show packaged rooftop unit part and control way, explain how compressor, fan, coil, damper, economizer work with thermostat, safety, and building auto system to keep comfort.
Identify major mechanical components and layoutUnderstand economizer and outdoor air functionsReview common safety switches and lockoutsOverview of basic thermostat and BAS interfacesTrace typical cooling and heating control sequencesLesson 11Ductwork inspection steps: static pressure checks, visual inspection for leaks, balancing dampers and grille/register checksDis part detail duct check method, include static pressure read, look for leak or damage, and check balance damper, grille, register so air flow go where design want.
Measure supply and return static pressuresInspect ducts for leaks, kinks, and insulation gapsLocate and set balancing dampers correctlyCheck grille and register sizing and orientationDocument deficiencies and recommend corrections
