Quality control for an industrial chiller goes far beyond final cosmetics. An industrial chiller integrates compressors, heat exchangers, refrigeration piping, electrical controls, pumps, fans, and protection devices. A failure in any single subsystem can compromise commissioning, cooling capacity, or operational stability.
Component Inspection Before Assembly
|
Component Category |
Key Inspection Checkpoints |
|
Compressors |
Model code accuracy, electrical rating, terminal integrity, and oil level |
|
Heat Exchangers |
Shell/plate specifications, connection sizing, pressure ratings, and surface finish |
|
Fluid Handling |
Pump performance curves, motor ratings, fan blade balancing, and casing integrity |
|
Controls & Electrical |
Controller firmware, sensor calibration, valve specs, contactors, and breakers |
|
Piping & Frame |
Copper pipe wall thickness, connection dimensions, frame alignment, and coating |
In-Process Manufacturing Inspection
Refrigeration Piping & Brazing
Refrigeration circuits are inspected during fabrication with strict focus on pipe routing, vibration clearance, and brazed joint quality. Proper brazing integrity prevents joint fatigue and micro-leaks during long-term operation.
Heat Exchanger Integration
Evaporators and condensers are verified for physical positioning, structural mounting, and connection compatibility before circuit sealing.
Electrical Assembly & Wiring
Control panels and power distribution are inspected against approved electrical schematics prior to powering up:
Wiring terminal tightness and wire color/numbering accuracy
Component ratings and protective relay settings
Sensor wiring shielding and controller port assignments
Refrigeration Pressure and Leak Testing
Pressure Hold Testing
The circuit is pressurized with dry nitrogen to designated test pressures to confirm structural integrity.
Leak Detection
Precision electronic leak detectors or helium mass spectrometers check all brazed joints, threaded fittings, and valve stems.
Electrical Safety and Functional Control Testing
Power Conformance
Ground continuity checks, insulation resistance (Megger) testing, and voltage alignment (e.g., 380V/50Hz, 460V/60Hz, 220V/60Hz).
Safety Interlocks
High/low pressure switches, flow switches, anti-freeze thermostats, and emergency stop functions.
Control Logic
Controller menu navigation, sensor feedback response, compressor staging logic, and remote communication protocols (Modbus / BACnet).
Cooling Performance Testing
|
Test Parameter |
Acceptance Criteria / Target Checkpoint |
|
Thermal Performance |
Chilled water inlet/outlet temperatures and delta-T compliance |
|
Fluid Dynamics |
Flow rate stability, pressure drop across heat exchangers |
|
Electrical Draw |
Running current (RLA), starting current spikes, phase balance |
|
System Pressures |
Suction pressure, discharge pressure, subcooling, and superheat |
|
Mechanical Health |
Operational noise level, compressor/fan vibration analysis |
Factory Acceptance Testing (FAT) for Project Orders
Pre-Agreed Protocol
Test conditions, fluid parameters, and measurement points defined prior to production.
Witnessed Testing
Client or third-party inspection (SGS, TUV, Intertek) option available.
Formal FAT Report
Documented log of operating parameters, electrical readings, and sign-off certificates.