HVAC vertical

HVAC PLC Simulator

Practice chiller sequencing, damper modulation, and boiler startup control in auto-graded browser scenarios. Write real IEC 61131-3 ladder logic — no install required.

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HVAC control scenarios

The three HVAC control challenges that trip up programmers

Chiller sequencing

Lead/lag chiller selection, runtime equalisation, status feedback, and fault switchover. Practice the logic that keeps cooling plants running efficiently.

Damper modulation

Variable-position analogue outputs (0–100%), setpoint tracking, mixed-air temperature control. Practice proportional damper control with real PID.

Boiler startup sequence

Multi-step startup with safety interlocks: purge timer, ignition sequence, flame proof, high-limit cutout. Practice safety-critical sequential control.

HVAC scenarios

Auto-graded HVAC machine scenarios

Chiller Sequencing

Lead/lag control, runtime hours, fault switchover.

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Damper Modulation

Analogue output, setpoint tracking, mixed-air temp.

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Boiler Startup

Purge timer, ignition, flame proof, high-limit interlock.

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PID Temperature

Closed-loop control, Kp/Ki/Kd tuning, trend settling.

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Pump Alternation

Lead/lag pump runtime equalisation, duty/standby.

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Tank Fill

Level sensor, fill valve, pump, overflow alarm.

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How it works

Sign up free

No credit card. Two scenarios unlocked immediately.

Read the scenario brief

Each HVAC scenario explains the process, I/O list, and control requirements.

Write your program

IEC 61131-3 ladder, structured text, or function block. Real execution against the machine model.

Get graded

Auto-grader checks your control logic against HVAC test cases. Instant feedback.

Why HVAC controls engineers use this

HVAC-specific scenarios: chiller, damper, boiler — not just traffic lights

Analogue I/O practice with scaled engineering units

PID tuning in a safe environment before commissioning real equipment

Multi-step startup sequence practice with safety interlock verification

Auto-graded — objective pass/fail on every test case

No hardware, no wiring, no site access needed

Try the HVAC scenarios free

Two scenarios free forever. Full access from a monthly rate.

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Questions

HVAC PLC FAQ

The simulator includes Chiller Sequencing (lead/lag chiller control with status monitoring), Damper Modulation (variable-position damper with analogue output control), and Boiler Startup Sequence (multi-step safety interlock startup). These are typical building automation and HVAC PLC applications.

Practice HVAC PLC programming today

Chiller, damper, boiler scenarios. No install. No credit card.

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