Lesson 1Two likely causes of floor-to-floor temperature differences: airflow imbalance (duct/vent, registers) and refrigerant or compressor performance issuesDis part splain di two main cause a floor-to-floor temp diff: airflow imbalance from duct or register issue, an problem wid refrigerant charge or compressor work weh cut 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 splain how fi confirm root cause a comfort wah gwaan usin airflow read, temp split, return air check, an when qualify, refrigerant charge check, fi sure data back any fix or contractor call.
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, regular task fi buildin tech, like change filter, balance register an diffuser, clear condensate drain, an do visual rooftop check while follow site safety an lockout.
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 complain come in, include check power an disconnect, scan fi oil or refrigerant stain, an confirm right condensate drain an unit state.
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 fi rooftop unit an duct, include filter change time, seasonal tune-up, coil an drain care, an record way weh cut breakdown an comfort complain.
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 pon thermostat an control check, include setpoint, schedule, zone clash, sensor place, an calibrate so control issue nuh mix up wid gear or duct failure.
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 up task weh only license HVAC man handle, stress legal need, refrigerant rule, big part change, an complex duct or electrical work weh pass buildin tech 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 splain how fi check repair or adjust sort comfort issue, usin temp map, airflow check, run time watch, an tenant feedback fi confirm steady run widout short-cycle or new imbalance.
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 outline regular check tech do before deep diagnose, focus pon filter, blower work, basic electrical check, an watch refrigerant pressure widout adjust charge unless qualify an allow.
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 bring in package rooftop unit part an control way, splain how compressor, fan, coil, damper, an economizer work wid thermostat, safety, an buildin auto system fi 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 way, include static pressure read, visual check fi leak or damage, an verify balance damper, grille, an register so airflow go weh design say.
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
