David PS
21-07-2003, 12:46 PM
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
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