Maintenance & Service Manual for Water & Freon Dual-System Cooling-Only Industrial Air Conditioner

1. System Overview

The Water & Freon Dual-System Cooling-Only Industrial Air Conditioner is designed for industrial cooling applications such as factories, workshops, production areas, and warehouses with high sensible heat load.

The system combines:

Refrigerant system (DX cooling) for direct cooling, and Water system for heat rejection or auxiliary heat exchange 
Due to its industrial-grade structure, proper operation and regular maintenance are essential to ensure stable performance, energy efficiency, and long service life.

2. Daily Operation Inspection

(Recommended: daily or each working shift)

2.1 Refrigerant System

* Check compressor operation sound for abnormal noise or vibration

* Monitor high-pressure and low-pressure readings to ensure normal range

* Inspect refrigerant piping, valves, and joints for oil stains or leakage

* Check evaporator coil for abnormal frosting or ice formation

2.2 Water System

* Confirm circulation water pump operates smoothly

* Check inlet and outlet water pressure difference

* Ensure sufficient water level in water tank or loop

* Observe water quality, color, and presence of sediment or impurities

2.3 Electrical & Control System

* Check control panel display and operating indicators

* Ensure safety protections and alarms are active

* Verify 380V / 50Hz three-phase power supply is stable and balanced

3. Periodic Maintenance Schedule

3.1 Monthly Maintenance

Air Filter

* Clean or replace return air filters

* Prevent dust accumulation on evaporator coil

Heat Exchangers

* Clean evaporator and condenser fins using compressed air or low-pressure water

* Straighten bent fins if necessary

Water System

* Clean water strainers and filters

* Inspect all water pipe connections for leakage

3.2 Quarterly Maintenance

Refrigerant System

* Check system operating pressure and superheat

* Inspect refrigerant charge condition

* Verify expansion valve or electronic expansion valve operation

Water System

* Drain part of circulating water and refill with clean water

* Add anti-scale, anti-corrosion, or biocide chemicals according to water quality

* Inspect water pump seals and bearings

Electrical System

* Tighten terminal connections inside electrical control panel

* Inspect contactors and relays for wear or overheating

3.3 Annual Maintenance

*(Recommended during planned shutdown)*

* Perform complete water system cleaning and descaling

* Inspect compressor insulation and motor condition

* Calibrate pressure sensors and temperature sensors

* Recheck and optimize operating parameters

* Inspect unit structure, coating, and corrosion protection

5. Operation & Safety Notes

* This unit is cooling only and for industrial use only

* Not designed for residential or comfort air conditioning applications

* Do not operate under water shortage, phase loss, or abnormal voltage conditions

* Refrigerant charging and system adjustment must be performed by qualified technicians

* Use original or approved spare parts for maintenance and replacement

6. Recommended Maintenance Frequency Summary

* Daily: Operation status and alarm check

* Monthly: Filters and heat exchangers

* Quarterly: Water quality, refrigerant system, electrical components

* Annually: Full system inspection and cleaning

7. Conclusion

Regular and proper maintenance ensures stable operation, high efficiency, and extended service life of the Water & Freon Dual-System Cooling-Only Industrial Air Conditioner, providing reliable cooling performance for industrial applications.