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Old 11-13-2012, 03:06 PM   #1
rvklein
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Default Johnson Controls Open on decrease vs increase questions

My glycol chiller's Thermostat (A19ABA-4) seems to get stuck from time to time and starts to freeze my glycol bath & the beer lines along with it. When I opened it up to get the model # it says it "Opens On Decrease". The replacement unit (A19ABC-24) says it "Closes on Rise".

Is this saying the same thing?

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Old 11-13-2012, 03:19 PM   #2
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I would hazard a guess that the two statements are functionally equivalent...

Cheers!

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Old 11-14-2012, 12:14 AM   #3
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Yeah, I would say they are the same functionally. I've seen many mechanical controls that have a single-pole, double-throw (SPDT) switch and you can wire the contacts as needed. If yours has 3 terminals on the micro switch, then it can be wired either way. A quick check with a meter will confirm it.....

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