Controls Tools

Controls laboratory · v0.1

4-Pipe FCU Controls Simulator

Configure a four-pipe fan coil sequence and explore temperature, valve modulation, and fan staging over simulated time.

Loading simulator…

Playback

Simulated time (s): —

Initializing playback controls…

FCU-01 · DDC graphic

RETURN AIR   ←   ←   ←   ROOM
  1. SUPPLY FAN—
  2. HWS → · ← HWRHeating coilHot water · —
  3. CHWS → · ← CHWRCooling coilChilled water · —
  4. Heating SP —Cooling SP —
    Room Temperature—

Estimated SAT: — °C

Supply air direction: fan → coils → room

Teaching diagram: animation indicates the commanded fan state, not measured airflow. Component order is illustrative; this is not a piping detail or a validated equipment arrangement.

HCV · Heating controller

Waiting for loop state.

P (percentage points)
—
Bias (%)
—
D (percentage points)
—
Raw P + Bias + D (%)
—
Valve output (%)
—
P / Bias / D contribution trend
PID traces will appear when selected.
Heating valve loop

Deadband holds CO; I adjusts bias. Effective PB = PB + deadband. D is currently unavailable.

Enter or finish editing to validate and apply this loop only. During playback, results update on the next step.

CCV · Cooling controller

Waiting for loop state.

P (percentage points)
—
Bias (%)
—
D (percentage points)
—
Raw P + Bias + D (%)
—
Valve output (%)
—
P / Bias / D contribution trend
PID traces will appear when selected.
Cooling valve loop

Deadband holds CO; I adjusts bias. Effective PB = PB + deadband. D is currently unavailable.

Enter or finish editing to validate and apply this loop only. During playback, results update on the next step.

ZONE · Setpoints & load

Configured values · measured room temperature is shown above.

Edit the points above, then Apply scenario. PID edits apply per loop. Initial temperature and capacities lock after Start.

Loading configuration…

Applied point values
Detailed operating readings

Current operating state

Waiting for initial controller evaluation.

Room temperature (°C)
—
Active heating setpoint (°C)
—
Active cooling setpoint (°C)
—
Operating mode
—
Heating valve (%)
—
Cooling valve (%)
—
Fan status
—

Trend log · select tags

Visible tags

Setpoint shows both active heating and cooling limits. SAT is an estimated discharge temperature, unavailable with the fan OFF. CO is the bounded loop output; valve commands currently follow CO exactly.

Left axis: °C · Right axis: % output. Zoom changes the view only; use Earlier / Later to move through history.

Fan stage history

Sequence explanation

Waiting for initial controller evaluation.

Read the sequence of operation

Event log

No run events yet.