Water Chillers play a vital role in temperature regulation during injection molding processes. Proper chiller operation directly affects product quality, equipment longevity, and energy efficiency. However, many factories face common problems such as condenser blockages, sudden drops in efficiency, or compressor damage due to improper handling. In this guide, we will cover five key operational practices that can help prevent these issues and improve chiller performance.

I. Pre-Startup Checklist: The “3 Checks + 1 Clean” Method

Before starting your industrial chiller, it’s essential to go through a few checks to ensure smooth operation.

Check the Water Circulation System

1. Verify that the cooling tower water level is above 80% to avoid pump dry-running.
2. Ensure that all pipeline valves are in the correct position. For instance, an electronics factory once experienced evaporator icing because a return valve was not fully open.

Clean Critical Components

1. Clean the condenser fins monthly using compressed air. A 1mm dust buildup can reduce cooling efficiency by 15%.
2. Inspect and clean the filter. Replace it if the pressure differential exceeds 0.1MPa.

Case Example: A factory in Zhejiang incurred CNY 120,000 in replacement costs for heat exchangers after a 30% cooling capacity loss caused by long-term evaporator scaling.

II. Monitoring During Operation: Keep an Eye on the “2 Gauges + 1 Parameter”

Regular monitoring of key parameters ensures that your industrial water chiller operates within safe and efficient limits.

Pressure Gauges

1. The normal range for the high-pressure gauge should be between 1.5-1.8MPa. If it exceeds 2.0MPa, this could indicate a condenser fan malfunction.
2. The low-pressure gauge should be above 0.3MPa. A reading below this suggests refrigerant leakage or an issue with the expansion valve.

Temperature Coordination

1. The temperature difference between inlet and outlet water should be between 3-5℃. Larger gaps could lead to excessive compressor cycling.
2. If the lubricant temperature exceeds 70℃, shut down the system immediately.

Quick Reminder:

1. High pressure? Clean the condenser.
2. Low pressure? Check for leaks.
3. Large temperature difference? Adjust the flow rate.

III. The “3-Step Gradual Shutdown” Process

A gradual shutdown process can prevent sudden equipment failure and enhance the lifespan of your chiller.

Disconnect Load 30 Minutes Early

1. Stop the mold heating process and wait for the mold temperature to drop below 60℃ before turning off the chiller.

System Depressurization

1. Keep the water pump running for an additional 5 minutes after shutdown to evacuate any remaining pressure from the system.

Pre-Poweroff Checks

1. Ensure that the pressure gauges have returned to zero. In humid conditions (relative humidity >80%), activate moisture-proof heating.

IV. Emergency Response: How to React in Critical Situations

Here’s how to handle some common emergency situations:

Symptom	Immediate Action	Critical Shutdown Triggers
Compressor Overload	Check voltage fluctuations (±10%)	Current >115% rated value
Abnormal Water Temperature	Clean the filter and refill coolant	ΔT >8℃ lasting for 20 minutes
Unusual Noise	Tighten bolts and balance fans	Metal grinding or severe vibration

Important: Never restart the recirculating water chiller if there’s a refrigerant leak. Always ensure the concentration is below 0.04% after ventilating the area.

V. Energy Efficiency Tips: Reducing Operating Costs

Optimizing Production Hours

1. Install mist cooling at the condenser intake during summer months to reduce energy consumption by 8-12%.
2. Use newer units with a Coefficient of Performance (COP) greater than 3.0 for more efficient cooling in multi-chiller systems.

Minimizing Idle Time

1. Turn off cooling tower fans during the night when the ambient temperature is below 25℃.
2. Install Variable Frequency Drives (VFDs) on pumps to achieve up to 25% energy savings at partial loads.

The Importance of Standardized Water Chiller Operations

Proper water chiller management is essential for maximizing efficiency and reducing operational costs. Implementing a closed-loop system that includes regular checks, maintenance, and parameter monitoring can significantly reduce downtime and extend equipment life.

A Japanese-funded factory reduced its chiller failures by 40% and saved CNY 80,000 annually in maintenance costs by following standardized operational procedures. By mastering these techniques, you can transform the potential of your equipment into substantial cost savings and higher productivity.