Freezers & ultra-low temperature
26 Field cases
- Cold Storage / Freezer Temperature Rising
- Walk-in Evaporator Frost Buildup / Defrost Failure
- Cold Storage Compressor Failure to Start / Overload
- Moisture Contamination in Cold Storage System
- Freezer Floor Heating Cable Break → Floor Frost Heave
- Door Gasket Hardening & Shrinkage → Cold Air Leakage (External Condensation Worsening)
- Air Curtain Insufficient Airflow → 30%+ Cold Air Loss on Door Opening
- Insulation Moisture Infiltration → Thermal Performance Halved (U-Value Doubles)
- Door Frame Heater Failure → Frame Condensation → Ice Bridge Formation
- CO2 Transcritical System High Pressure Fault (Gas Cooler Control Failure)
- CO2 Dry Ice Blockage in Expansion Valve (Operation Below Triple Point)
- NH3 Refrigerator Oil Emulsification (Moisture Ingress)
- NH3 Leak Detector Alarm Response (25 ppm Warning to 500 ppm Evacuation)
- CO2 Cascade Intermediate Heat Exchanger (IHX) Excessive Temperature Deviation (-40°C Low-Temp System)
- Blast Freezer Food Core Temp Not Reaching -18°C
- Ultra-Low Temp (-50°C) Two-Stage Compression Intermediate Pressure Control Failure
- Air Blast Cooler Fan Belt Wear → Reduced Airflow and Cooling Capacity
- DX Evaporator Multi-circuit Maldistribution — Superheat Imbalance Between Circuits
- Shell-and-Tube Chilled Water Evaporator Tube Freeze Damage — During Winter Shutdown
- Plate Heat Exchanger Leak — Refrigerant and Chilled Water Cross-contamination
- Evaporator Coil Fouling — Dust Accumulation in Air-Cooled Indoor Unit
- Evaporator Pressure (SST) Dropping Below Design Value — Insufficient Air or Water Flow
- Cascade system: high stage runs but low stage does not start (no cooling at all)
- Cascade unit will not reach -80°C, holds at -50 to -60°C
- Cascade unit: low running pressures on both sides (no cooling) — how to confirm a leak
- Two-stage compressor discharge gas temperature too high (oil carbonisation, viscosity loss)