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11-12-2008, 07:21 PM #1
York Chiller startup when on Emergency Power
Hi everyone, great forum.
Looking for some insight on our 850 Ton York Centrifugal Chiller.
I realize there are certain interlocks and protection measures programmed into the control board on these chillers, our building is very dependent on stable process cooling.
When we have a power loss and the generator fires up, the York Chiller initiates shutdown. There is a minute or so period where it will not allow a reset until the compressor and everything has stabilized off. Then we manually reset it and initiate the restart sequence. Takes about 10 mins overall.
My question is whether we can decrease the timeline where the chiller shuts down and restarts up to full load again.
Ours runs at 40% for 5-10 mins and then incrementally goes up to 100%. The cooling load usually increases dramatically during this transition period and takes a while to get back within specs (41.0F cooling supply).
Is there a way to have the chiller ramp up to 100% once the initial 40% start-up/warm-up period is over?
Or decrease the time it stays at 40% since the chiller intself is already warm / at operating temperature?
Any suggestions, or is this even possible?
FYI, the unit has a VFD, we have the limit set to 100%.
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