Hands-on simulators for HVAC/R apprentices. Run the system, change the settings, break a part, and find the fault with the gauges and a meter. Free, no sign-in, works on a phone.
Split AC, heat pump with a reversing valve, and walk-in cooler and freezer pump-down systems. Six refrigerants.
Gas furnace, 80% and 96%: the full ignition sequence, limits, rollout, pressure switch, flame sensing and CO.
Hot water and steam boilers with a water-level cutaway, low-water cutoffs, relief valves and the Hartford loop.
One air handler run two ways: pneumatic (compressor, PRV, two-pipe thermostat) and DDC (sensors, 2–10 V, PI loop, trend).
Drag parts onto a board, wire them terminal to terminal and test with a live multimeter. Miswire it and see the arc flash.
Build ladder diagrams from ready-made parts: contactors, relays, timers, switches and a 24 V thermostat. Then run them.
A 10 hp motor on a variable frequency drive with bypass: ramps, DC bus, overloads, single phasing and drive fault codes.
Each trainer starts running. Change setpoints and switches and watch pressures, temperatures and flows respond.
Pick a failure, or start a mystery fault and diagnose it with the gauges, the meter and the log before you reveal it.
Tap any part for what it is, how it works in the system, how it fails, and sources.