Common Problems and Solutions for Mobile Industrial Coolers

1. Poor Cooling Performance/Slow Cooling

Possible Causes

Condenser Blockage: Dust and oil cover the fins of mobile industrial coolers (common in textile and foundry workshops).

Insufficient Refrigerant: System leaks lead to insufficient refrigerant (observe the pressure gauge below the standard value).

Clogged Filter: The water filter of a water-cooled unit is clogged with impurities (the flow meter indicates a reduced flow rate).

Solutions

Cleaning the Condenser: Use a high-pressure air gun to blow from the inside out. For stubborn oil stains, use a specialized cleaning agent.

Checking for Leaks and Refrigerant Refills: Use soapy water to inspect the copper pipe joints. Repair leaks with welds, then vacuum and refill (certified professional required).

Filter Replacement: Disassemble and clean the Y-type filter monthly. Install a water softener in areas with poor water quality.

 

2. Frequent Equipment Alarms and Shutdowns

Alarm Code Analysis

Code	Meaning	Emergency Action
E1	High Pressure Protection	Check if the condenser fan is stuck.
E2	Low Pressure Protection	Check for refrigerant leaks or expansion valve failure.
E4	Water Temperature Too High	Clean the water tank or check the water pump operation.

Advanced Treatment

High-Pressure Alarm: When the ambient temperature exceeds 45°C, install a sunshade or connect an external air duct.

Water Flow Alarm: Check for kinks in the pipes and cracks in the water pump impeller (use manual vibration to determine).

3. Cooling Water Scaling/Corrosion Piping

Problem and Hazards: Scale reduces heat exchange efficiency by 20%-50%. Corrosion and perforation can cause coolant leakage.

 

Preventative Measures: Water Treatment:

Use deionized or distilled water (conductivity <50 μS/cm).

Add a corrosion inhibitor (such as ethylene glycol, 5%-10%).

 

Regular Maintenance:

Clean the pipes every three months with a citric acid solution (10% solution, 60°C for two hours).

Install an electronic descaling device (magnetic scale inhibitor).

4. Abnormal Noise (>75 dB)

Noise Source Identification: Compressor Noise: Loose anchor bolts (tighten to 35 N·m with a torque wrench). Abnormal fan noise: Bearings lacking oil (add Mobil XHP222 grease).

 

Pipe resonance: Install rubber shock-absorbing pads on suspended pipes.

 

Noise reduction solutions:

Add a soundproof cover to the compressor (reduces noise by 15 dB).

Replace with a low-noise scroll compressor (30% quieter than a piston compressor).

5.  Water Leakage: Locating the Leak

Joint leakage: Deterioration of the quick-connect seal (replace with a fluorocarbon rubber ring to extend its life by three times).

 

Water tank leakage: Weld cracking (temporarily repair with epoxy resin; permanent solution requires argon arc welding).

 

Drain valve failure: Seized valve core (disassemble, clean, or replace).

 

Emergency measures:

If the leak is small: Cover with an absorbent blanket and close the water inlet valve.

Excessive water spray: Immediately disconnect the power supply to prevent electrical shorts.

6. Movable wheels damaged/unable to move

Cause of failure: Overloaded wheels (standard load capacity 150 kg per wheel; exceeding the limit causes bearing fracture).

 

Uneven ground (gravel scratches the polyurethane wheel surface). Improvement Plan

Replace heavy-duty universal wheels (with brakes, 300kg/wheel load capacity).

Pave a steel channel (avoid potholes).

7. Electrical Control System Failure

Common Problems

Touchscreen malfunction: Moisture intrusion (dry with a hair dryer at 60°C after shutting down the machine).

PLC no output: Check if the 24V power module is burnt out (measure the output voltage with a multimeter).

Sensor false alarm: Temperature sensor drift (calibrate or replace the PT100 probe).

Preventative Recommendations

Install a lightning arrester (especially for outdoor use).

Clean the control cabinet weekly to prevent short circuits.

Maintenance cycle table:

Items	Frequency	Operational Points
Condenser Cleaning	Monthly	Air Pressure 0.3 MPa, Reverse Purge
Refrigerant Pressure Test	Quarterly	High Pressure 1.5-2.0 MPa, Low Pressure 0.4-0.6 MPa
Water System Descaling	Semi-annually	Citric Acid Circulation Cleaning
Electrical Safety Inspection	Annually	Insulation Resistance Test > 2 MΩ