Chilled Water System Maintenance

Chilled Water System Flow Switch Maintenance

Chilled Water System Maintenance

Maintenance of the Chilled Water System Flow Switch

The chilled water system flow switch requires regular maintenance due to a to build up of contaminants on the sensor. Over time, slime accumulates giving false readings. The problem is relatively easy to sort out: a wipe with a cloth

Retrieving the sensor

The more difficult part is deciding how the retrieve the sensor. It is fixed with a bolt into the chilled water system being maintained. Therefore there is pressure inside. The textbook way to do the job is to valve off the section of pipework, then drain the glycol into a vessel. There are other ways known to an engineer

Snatching the Flow Switch!

Although not text book: snatching the flow switch is a considerably easier way of maintaining the chilled water system! One of our seasoned engineers unscrewed the bolt whilst holding the flow switch in. He whipped it out- gave it a quick wipe and stuck it back in! Only a small amount of the secondary coolant was lost (which shot out- loosing no height) He re-tightened the bolt and the job was done

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Checking the Fault Out Level

As you can see from the picture: there is a green light on 0. This indicates that the pump is off. Not to be confused with pressure, as there will be a couple of bar on a roof an 6 bar or so in a basement. The higher pressure in a basement is due to the head of water pushing down. With the pump on: the green lights go all the way up to 9 with the fault out level showing red on 7

Maintaining the Chilled Water System Fault Out Level

Maintaining the chilled water system flow switch can be achieved with a terminal driver. Using the manual that comes with the flow switch: the buttons can pressed a number of times to 'self test' Also, the fault out level can be set

Testing the Flow Switch

As part of the maintenance, the flow switch is manually tested using one of two methods. This ensures that the switch will function correctly when it needs to

Read more about flow measurement on Wikipedia


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Maximus Chillers

Centrifugal Chiller and Industrial Refrigeration Specialists- Maximus Chillers

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