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Thread: Water Chiller Control
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21-07-2003, 12:46 PM #1
Water Chiller Control
We were asked to look at a chiller with control problems.
It is a stand alone unit which serves two ahu. The unit operates when a set of external volt free contacts complete a circuit.
Chilling to the ahu is controlled by the BMS and mechanical valves.
The external contacts are controlled via a small pressurization unit, which consists of a header tank, pump and high & low pressure switches.
The pressurization unit pumps is connected via water piping to the chilled water ring.
Can anyone shed any light as to how the control logic is meant to work.
Thanks
David
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21-07-2003, 07:57 PM #2
The pressurization unit mainly, leading on to the chiller.
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29-08-2006, 09:14 PM #3
Re: Water Chiller Control
What sort of control problems are you getting? I can't see the pressurization unit sending the enable signal though although it might be an interlock. I would suggest attending site with the controls company to determine which is at fault, the chiller or the controls.
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29-08-2006, 09:29 PM #4
Re: Water Chiller Control
It's better to keep your mouth shut and give the impression that you're stupid than to open it and remove all doubt.
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29-08-2006, 11:14 PM #5
Re: Water Chiller Control
Have to say folks that we have missed this post somewhat.
As it is over three years old I would imagine that he has resolved the matter by nowBrian - Newton Abbot, Devon, UK
Retired March 2015
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