A Complete Guide to Water Cooled Screw Chiller Maintenance

If you want your water screw chiller to operate optimally without any possible downtime, then you must invest in a predictable maintenance schedule.

Through a well-planned water-cooled screw chiller maintenance schedule, you can detect possible faults early and replace faulty components.

In this article, we will explore all the fundamental aspects about screw chiller maintenance process. First, let’s start with:

Importance of Water-Cooled Screw Chiller Maintenance

· Reduces Costs due to Total Breakdown

Preventive care is better than emergency repairs in any cooling system. Therefore, small routine service saves more money over time than compressor replacement, which can be costly.

· Prolongs the Equipment Lifespan

With proper maintenance schedule, your screw chiller will serve you for many years. Just ensure that every component of the chiller is maintained properly and regularly.

· Prevents Unexpected Breakdown

Preventive maintenance of your chiller regularly, like monitoring refrigerant, oil checks, and filter replacement, will help you avoid expensive system failure.

· Guarantee Continuous Operation

Most of these chiller systems are designed to operate continuously. Therefore, you must maintain these chillers to avoid any breakdowns or downtime.

Of course, this will also ensure energy efficiency when operating chiller systems

Water Cooled Screw Chiller Maintenance Process

Maintaining screw chillers involves many procedures. Remember, water cooled screw chillers are made up of many components that require maintenance.

From screw compressor, heat exchanger systems, refrigerant circuit, to cooling tower; every part requires a unique maintenance process. Therefore, in this section, we will explore 11 critical maintenance guidelines for water cooled screw chillers.

· Keep Condenser Tubes Clean

You should use anti-scaling chemicals for proper water treatment to prevent dirt buildup. This is a sure way to remove dirt and debris from cooling water for the chiller system.

Additionally, other measures may include brushing and flushing the chiller tubes after every 6 months. With such measures, you not only prevent dirt buildup, but also tube foiling.

· Regular Cooling Tower Maintenance

A clean cooling tower ensures your water-cooled screw chiller functions efficiently by preventing possible water contamination, which can cause system failure.

Usually, regular cleaning prevents scaling, corrosion, and biological growth like algae by controlling TDS and conductivity. Additionally, it helps to maintain the correct pH level.

You must inspect and lubricate fan bearings and bolts to extend tower lifespan and prevent breakdown.

· Inspect and Maintain Evaporators

You should monitor chilled water temperatures, pressure drop, and pay attention to any unusual noise to keep cooling capacity stable and protect the compressor from damage.

Additionally, ensure you check the chilled water inlet and outlet temperature to maintain proper pH hardness and clean strainers to prevent scaling.

· Protect the Screw Compressor through Proper Oil Management

Clean oil prevents screw compressors from overheating, thus extending your machine’s lifespan. However, testing your oil for acidity, moisture, and metal particles since early detection of rotor and bearing wear prevents costly breakdowns.

· Regular Monitoring of Operating Pressure and Temperature

Modern water cooled screw chillers feature advanced sensors. You can use digital sensors with alarms to examine if pressure or temperature goes beyond limits, since this will prevent unexpected failures and maintain efficiency.

But even more importantly, you must keep a record of daily readings and compare them with historical data for trends. It is at this point that you will be able to notice any deviations and investigate the probable problem and recommended solution.

At the same time, you must check all gauges and suction pressure since low pressure may indicate a refrigerant shortage or evaporator issue.

· Ensure Proper Water Flow in all Circuits

Verify flow switch operation since correct water flow in both circuits leads to efficient and reliable water cooled screw chiller function. Without correct flow, the system risks serious damage.

You should regularly check pump amperage and vibration to maintain full cooling capacity and prevent high-pressure trips.

· Check Electrical Components and Sensors

You should tighten cable connections to prevent short circuits and unexpected shutdowns. By conducting this regularly, it will ensure that electrical components work reliably and accurately at all times.

It is also important to note that one of the main causes of compressor failure is faulty circuit breakers.

Remember, all these electrical tests must be conducted by certified professionals, while following the chiller manufacturer’s manual.

· Watch for Unusual Vibrations and Noise

These are always the first warning signs of mechanical problems, so make sure you measure the vibrating levels regularly. Among the main causes of vibrations in water cooled screw chillers is the rotor imbalance or refrigerant slugging.

Tighten loose bolts and inspect bearings since ignoring unusual vibration can lead to bearing failure, shaft damage, and compressor breakdown.

· Maintain Proper Refrigerant Charge

You should always maintain the correct suction and discharge since too little or too much refrigerant affects the performance of the compressor.

It is important to ensure that your chiller operates on low-GWP refrigerants. More importantly, you should check the properties of the refrigerant to ensure maximum efficiency and stable operation.

· Keep a Detailed Maintenance Record

By tracking and keeping records on the water cooled screw chiller maintenance schedule, it will be easier to detect abnormal trends. These records should be detailed and cover every aspect of the maintenance process, including records of parts replaced, refrigerant recharge amount, oil, and filter replacement, among other variables.

It is one of the most effective ways to improve efficiency, reduce downtime, and extend the service lifespan of chiller systems.

Recommended Maintenance Schedule

In case you are wondering how frequently you should maintain water cooled screw chiller, the schedule below highlights an overview of what you should consider:

FAQs

How often should you service screw chillers?

It can range from daily, weekly, monthly, to quarterly, depending on the parts or parameters you would like to monitor.

Why is oil analysis important in screw compressors in chillers?

In screw compressors, oil serves as a lubricant, while also helping in sealing and capacity control.

By analyzing oil in screw compressors, you will control both contaminants and viscosity. By controlling these, you will increase compression efficiency and protect the compressor from damage.

What causes “slugging” in screw chillers?

It is mainly due to a faulty expansion valve, or at times, this may be due to overcharging the system.

Normally, this may cause liquid refrigerant to enter the screw compressor system, which can result in screw rotor failure.

What is the average lifespan of screw compressors in chillers?

With proper maintenance, it can serve you for 15 to 20 years.

Chillerone: Your Trusted Water Cooled Screw Chiller Manufacturer in China

For over 15 years, Chillerone has been designing and manufacturing water cooled screw chillers in China for many global companies. With every chiller, Chillerone offers all the needed technical support, including maintenance and replacement parts.

Additionally, the company has also invested in other types of chiller systems, like the centrifugal chiller, magnetic chiller, and scroll chillers. Therefore, when you partner with Chillerone, you get a wide range of cooling system options to choose from – Let our engineers size your chillers now.