Chillers
35 Field cases
- Chiller Low Pressure (LP) Trip — Low Refrigerant or Expansion Valve Fault
- Unable to Reach Process Temperature — Chiller Setpoint Not Achieved
- Compressor Unresponsive Despite Start Command from Control Panel
- Oil Pressure Trip / Low Oil Level
- Water-Cooled Condenser Tube Fouling (ΔT >5°C)
- Air-Cooled Chiller High-Temperature Trip (Ambient >45°C)
- Screw Compressor Slide Valve Stuck (Partial Load Control Failure)
- Screw Chiller Oil Filter Clog (ΔP >0.15 MPa, Replace Every 2,000 Hours)
- Chilled Water Glycol Concentration Fault (Freeze Risk)
- Low Chilled Water Flow → Evaporator Freeze Protection Trip
- Chiller High Pressure (HP) Trip — Compressor Shutdown
- Primary/Secondary Pump Decoupler Reverse Flow — Bypass Piping Design Error
- Inverter Chiller Below 50% Part-Load — Efficiency Drop and Surge Risk
- VPF Variable Primary Flow Control Valve Hunting — PID Re-tuning and 40% Minimum Flow
- Multiple Chiller Sequence Control Imbalance — Operating Hours Rotation Failure
- Absorption Chiller Vacuum Loss — Non-condensable Gas Accumulation
- Absorption Chiller LiBr Crystallization Accident — Pipe and Heat Exchanger Blockage
- Centrifugal Chiller Surging — Repeated Impact Noise and Vibration
- Centrifugal Impeller Abnormal Vibration — Mass Imbalance or Bearing Damage
- Economizer Valve Stuck → Efficiency Loss
- Floating Head Pressure Control Failure → Fixed High Condensing Pressure
- Heat Recovery Circuit Switching Failure → Waste Heat Loss
- Chilled Water Reset Control Not Applied → Overcooling & Excess Power
- Brazed Plate Heat Exchanger Freeze Fracture
- Shell & Tube Tube Sheet Leakage (Galvanic Corrosion)
- Air-Cooled Coil Fin Damage → Increased Airflow Resistance (ΔP Rise)
- Double-Pipe Condenser Refrigerant/Water Cross-Leakage (Pressure Test Identification)
- U-Bend Fatigue Cracking from Thermal Stress and Freezing
- High Pressure Rise from Condenser Fan Failure
- High Pressure Rise from Condenser Coil Fouling
- High Pressure Rise from Non-condensable Gas (Air) in Circuit
- High Pressure Rise from Refrigerant Overcharge
- High Pressure Rise from Insufficient Cooling Water Flow (Water-Cooled)
- Poor Heat Transfer from Scale Buildup on Cooling Tubes (Water-Cooled)
- Cooling Water Temperature Rise (Water-Cooled)