Hands-on HVAC training

Build better
troubleshooters.

Three demo service calls across gas furnace scenarios. Test the system, find the fault, and make the right diagnosis before the clock gets away from you.

3Demo calls

4Field tools

1Correct diagnosis

Technician access

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PINs are stored as one-way hashes. Scores are shared securely from the server.

Training board

Choose your service call

Complete each diagnosis to unlock the next call.

0 of 3 complete

Shop standings

Overall scoreboard

Ranked by calls completed, then lowest combined best time.

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Equipment Gas furnace

Power W call Fault

Line voltage 24 V control Neutral / common

Combustion / ignition

Controls / airflow

ThermostatField wiring

Inducer motorDraft assembly

Pressure switchDraft proving

Hot-surface igniterIgnition load

Gas valve24 V operator

Flame sensorRectification

High limitSafety circuit

Integrated furnace controlPower, calls, safeties, and outputs

POWER

THERMOSTAT

OUTPUTS / INPUTS

Transformer120 V / 24 V

PSC blower assemblySquirrel-cage wheel and scroll housing

Capacitor10 µF

FilterReturn air

Condenser section

Evaporator / air section

Controls

Scroll compressor3-phase refrigerant pump

Condenser fanOutdoor coil airflow

Condenser coilRejects heat outdoors

Evaporator coilCooling / dehumidification

Supply fanConditioned-air section

EconomizerOutdoor / return dampers

Compressor contactorY1 cooling output

RTU controllerCooling, fan, economizer

Filter bank

Air path / burner profile

Engineered Air controls and safeties

Outdoor intake100% make-up air

Filter bankUpstream of fan

Supply fanBuilding pressurization

Direct-fired burnerProfile plate and flame

Airflow proofBurner enable safety

Supply fan VFDSpeed command / motor output

45.0 Hz

DJM3 discharge controllerFan, heat, safeties, discharge reset

Low-temperature limitManual-reset freeze protection

Discharge sensorSupply temperature feedback

Modulating gas valveBurner firing-rate control

Condensing unit and pump-down control

Walk-in freezer unit cooler

Control panel / ladder

Low-temp compressorR-404A semi-hermetic

CondenserHeat rejection coil

Condenser fanHead-pressure control

ReceiverLiquid storage

Filter-drierLiquid-line protection

Liquid solenoidPump-down valve

TXVExternal equalizer

Unit cooler coilLow-temperature evaporator

Evaporator fansFan-delay controlled

Defrost heaters6.0 kW electric bank

Defrost sensorTermination / fan delay

Freezer controllerTemperature, defrost, fan delay

-10 F

Low-pressure controlPump-down cut-in / cut-out

Compressor contactorLow-pressure controlled