Monthly Archives: September 2017

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Chiller Manufacturers

You’ve seen the rest- now choose the best! We have recently carried out a bespoke NH3 installation. The customer’s requirements meant that the plant had to operate in conjunction with a free cooler to minimise costs. Free coolers are a very good option in the UK due to the cool ambient temperatures. One consideration is a potential freeze up during the Christmas shut down. Because of this I have made a point of reminding my customers to drain down over the holidays. Glycol is a popular choice to prevent this but it reduces system capacity so it is better used for below zero degrees applications. Trace heating is good for the pipework but it will not protect the free cooler itself Read More


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Centrifugal Chillers

Centrifs don’t have as high a compression ratio as positive displacement compressors but they compress a lot higher volume of refrigerant. They are the choice for large tonnage applications. We have a 9 mega watt system that we look after. A common issue with centrifs is surging: when there is low load, the compressor tries to suck, stalls then tries again. This causes the impeller and high speed shaft to rock forwards and backwards causing severe damage. There is a proximity sensor to shut the machine down in this condition but grinding of the impeller against the casting can still occur. After we re-built the compressor we installed controls to shut down the chiller when the process stopped. Should have been like that from commissioning but we were only brought in after the customer started having issues with the installer. Now we have got the machine to settle down- the customer are over the moon  Read More


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Chiller Sales

Maximus chillers has grown exponentially in the field of chiller sales- we feel this is because of our quality equipment and excellent customer service. We have recently installed an HH3 chiller for a non industrial application. The customer was concerned with environmental issues so it was the perfect choice. Ammonia chillers are a lot more expensive than HFC chillers but they have double the lifespan. The machine will pay for itself over time. It is difficult to guess how the industry will go during the HFC phase own: my personal opinion favours ammonia although propane and HFO’s are possibilities. The drawback with HFO’s is the cost of the refrigerant; also we have just been through the CFC issue with the environment and putting another man made chemical up there may cause other problems- only time will tell  Read More