Author Archives: Dave

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CO2 Refrigeration

CO2 is the oldest commercially successful refrigerant widely used in the industrial sector until the advent of CFC’s. It is now making a come back as the evangelical naturals community rate its environmental friendliness. It is popular in supermarket chains conscious of keeping a low carbon footprint. The technology is evolving but at present CO2 is more efficient below 21 degrees ambient Read More


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Propane Chillers

Propane has a long history as a natural refrigerant. We have just completed a gas leak for one of our customers. There was no refrigerant in the system on arrival- a leak on the discharge. With the fact that the refrigerant is flammable it is of significant importance to purge the system with oxygen free nitrogen before and during brazing. After the pressure test we started the evacuation process- a standard HFC vac pump is acceptable within the health and safety guide lines so long as it is switched on remotely. Re-charge and test operation- another good job by Maximus Chillers! Read more


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Data Centre Cooling

Let’s keep your computers nice and cool! On a recent job we had a controller fail on a down flow unit. We decided to fit a Carel controller and re-wire the machine because we are adept at controls retrofitting which is often cheaper than the manufacturers’ controller. The first step is to strip back the wiring and remove the controller. Next- fit the new controller and wire in the controller’s power supply, inputs and outputs. Switch it on and program the controller. Test operation- okay Read More


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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


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Chiller Installation

Our installation team is used to working to tight deadlines and to high specifications. We have the capability to get the job done ahead of schedule using weekends and factory shut downs as an ideal opportunity for the job. We decommission and environmentally dispose of the old chiller according to industry standards. We ensure the refrigerant is decanted, the oil drained and recycled. All work is guaranteed for the highest level of after sales support and customer service. If you are going to do a job- do it right!  Read More