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Thread: load
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11-16-2005, 09:39 PM #1
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how is the best way to tell how much load is on your chiller. I know it sounds like a dumb question. but i have been told anywhere from motor output to guide vanes please help a rookie understand
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11-16-2005, 09:53 PM #2
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Are you trying to figure out tonnage?
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11-16-2005, 09:56 PM #3
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load
no im just trying to figure out what my load is. we have new chillers and we are building new buildings on the campus so im trying to figure out. how much load i have in relation to my equipment
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11-17-2005, 12:09 AM #4
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in other words if i walk up to a machine.By looking at the pic controls how can i tell how much load the machines is under at that particular moment.is it motor current? guide vanes? what??????????
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11-17-2005, 12:42 AM #5
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Normally it would be motor current
If you dont stand behind our troops, please feel free...........to stand in front of them.
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11-17-2005, 05:16 AM #6
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Evap temp too.
Not what it use to be
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11-17-2005, 09:14 AM #7
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simple...Example,if the chiller is rated for 250 amps and your reading say 175A on the starter amp meter that is 70% of the full rating.then take that 70% and do the math with the tonnage of the chiller.there are a lot of items tht can effect that amperage from,dirty condenser tubes to loose belts on the tower,and blocked strainers on the same condenser.most charges on big chillers are totaled at twice the tonnage give or take...usually more(leaks as freon goes out your tonnage drops)!you will get so familiar with its loading?unloading and sounds that you will see as the sun swings and people enter or leave buildings...the chiller will react to those loads and the amps will change.the setpoints for chilled water out of it..40F....42F...45F all these setpoints will drive the amps up.if the buildings are cool(68F-75F range) then your return water will be 10F above the setpoint(chilled water out)and the machine will unload and back the amps down.work the control panel to see the chiller react...it won't bite you.
"when in doubt...jump it out" http://www.youtube.com/watch?v=aMy-sAHwS4E
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11-17-2005, 09:17 AM #8
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how would you figure load using evap temp
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11-17-2005, 09:56 AM #9
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Inlet chilled water temp..... when it's high you gotta load...when it's low you don't....look at your chilled water delta t.
It's just like looking at your return air temp on a dx system
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11-17-2005, 09:24 PM #10
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We go by amperage. The panel can also read out percentage of FLA.
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