Technical Action Plan

// Boiler Lead/Lag Control Sequence
IF (BoilerLeadLagMode == AUTO) THEN
  // Enable cascade control based on load
  IF (HeatingLoad > 90%) THEN
    ActiveBoilers = 4
  ELSE IF (HeatingLoad > 70%) THEN
    ActiveBoilers = 3  
  ELSE IF (HeatingLoad > 40%) THEN
    ActiveBoilers = 2
  ELSE
    ActiveBoilers = 1
  END IF
  
  // Implement rotation every 168 hours
  IF (LeadBoilerRuntime > 168) THEN
    RotateLeadBoiler()
  END IF
END IF

// Anti-short cycling protection
// Minimum 3-minute off-time between cycles
FOR EACH Boiler
  IF (Boiler.Status == OFF AND 
      Boiler.TimeOff < 180) THEN
    PREVENT Boiler.Start
  END IF
END FOR

// Chilled Water Reset Schedule
// Based on outdoor ambient temperature
IF (OutdoorTemp >= 30) THEN
  ChilledWaterSetpoint = 6.0
ELSE IF (OutdoorTemp >= 25) THEN
  ChilledWaterSetpoint = 6.5
ELSE IF (OutdoorTemp >= 20) THEN
  ChilledWaterSetpoint = 7.0
ELSE IF (OutdoorTemp >= 15) THEN
  ChilledWaterSetpoint = 7.5
ELSE
  ChilledWaterSetpoint = 8.0
END IF

// Increase setpoint by 1°C during non-occupancy
IF (BuildingOccupied == FALSE) THEN
  ChilledWaterSetpoint = ChilledWaterSetpoint + 1.0
END IF

// Demand Limiting Control
// Prevent unnecessary staging
IF (ChillerLoad > 90% AND 
    BuildingDemand > DemandThreshold) THEN
  
  // Check if we can reduce speed
  IF (ZoneTemps.All <= Setpoint + 0.5) THEN
    // Implement soft limiting
    MaxCapacity = 90%
  END IF
  
ELSE IF (ChillerLoad > 75% AND 
         TimeInCurrentState < 300) THEN
  // Delay further staging
  MaxCapacity = 85%
ELSE
  // Normal operation
  MaxCapacity = 100%
END IF

// Trim & Respond Logic for AHU Static Pressure
// Sample every 120 seconds

// Initial Values
TrimAmount = 2
RespondAmount = 5
ResponseThreshold = 30%
MaxPressureSetpoint = 300
MinPressureSetpoint = 50

// Get maximum VAV damper position
MaxDamperPosition = MAX(AllVAVDampers)

// Trim logic - reduce setpoint when demand is low
IF (MaxDamperPosition < ResponseThreshold) THEN
  // Trim down pressure setpoint
  StaticPressureSetpoint = 
    MAX(StaticPressureSetpoint - TrimAmount, 
        MinPressureSetpoint)
        
// Respond logic - increase when demand is high
ELSE IF (MaxDamperPosition > 80%) THEN
  // Respond with increased pressure
  StaticPressureSetpoint = 
    MIN(StaticPressureSetpoint + 
        (RespondAmount * 
        (MaxDamperPosition - 80) / 20), 
        MaxPressureSetpoint)
END IF

// Pump DP Reset Logic based on valve positions
// Apply to CHWP & HWP systems

// Define operational parameters
BaseDpSetpoint = 100  // kPa
MaxDpSetpoint = 150   // kPa
MinDpSetpoint = 60    // kPa

// Get control valve positions from terminal units
MaxValvePosition = MAX(TerminalControlValves)

// Implement reset algorithm
IF (MaxValvePosition < 60) THEN
  // Reduce pressure when demand is low
  DpSetpoint = MAX(BaseDpSetpoint * 
               (0.5 + (MaxValvePosition / 120)),
               MinDpSetpoint)
ELSE IF (MaxValvePosition > 85) THEN
  // Increase pressure when valves are open wide
  DpSetpoint = MIN(BaseDpSetpoint * 
               (1 + ((MaxValvePosition-85) / 60)),
               MaxDpSetpoint)
ELSE
  // Maintain base setpoint in normal range
  DpSetpoint = BaseDpSetpoint
END IF

// Enhanced CT Pump Control Logic
// With runtime balancing and fault tolerance

// Runtime-based rotation
// Swap lead/standby every Monday at 06:00
IF (CurrentDay == MONDAY AND CurrentTime == 06:00) THEN
  SwapLeadStandbyPumps()
END IF

// Pump 2 operational logic
// Prevents short cycling during low cooling tower load
IF (CTPump2.Status == RUNNING) THEN
  // Only stop after minimum runtime
  IF (CTPump2.RunTime < 900) THEN // 15 minutes
    PREVENT CTPump2.Stop
  END IF
  
  // Only stop if load is consistently low
  IF (CTLoad > 20%) THEN
    PREVENT CTPump2.Stop
  ELSE IF (LowLoadTime < 300) THEN // 5 minutes
    PREVENT CTPump2.Stop
  END IF
END IF