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Author Topic: Aquastat  (Read 4427 times)

jerkash

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Aquastat
« on: November 04, 2013, 05:48:31 PM »
I'm on my 3rd year with a OWF.  I have always had my Aquastat set on 170 -180.  The way mine works is I set it on 180 and set it with a 10 degree difference which means it comes on at 170 and off at 180.  Went by it today and it was off but the temp was 185.  Just checked on it again and it was 185 and still running.  Set it back to cut off at 175 and it cut off.  Anyone have any ideas what may have happened.  It has worked fine until now.
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willieG

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Re: Aquastat
« Reply #1 on: November 04, 2013, 05:51:05 PM »
Quote from: jerkash on November 04, 2013, 05:48:31 PM
I'm on my 3rd year with a OWF.  I have always had my Aquastat set on 170 -180.  The way mine works is I set it on 180 and set it with a 10 degree difference which means it comes on at 170 and off at 180.  Went by it today and it was off but the temp was 185.  Just checked on it again and it was 185 and still running.  Set it back to cut off at 175 and it cut off.  Anyone have any ideas what may have happened.  It has worked fine until now.

it is likely a dry well aquastat and it could now hove some crud on teh water side of it that is giving you a false (cooler than real temp)  reading?

i would check the water temp with a candy thermometer at teh boiler and see what teh real temp is and then adjust your aquastat
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home made OWB (2012)
Ontario Canada

jerkash

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Re: Aquastat
« Reply #2 on: November 04, 2013, 05:55:44 PM »
Thanks Willie - It is a dry well, but shouldn't it still cut off when it shows 180 degrees?
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willieG

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Re: Aquastat
« Reply #3 on: November 04, 2013, 06:03:41 PM »
im not sure what makes them shut off..a ehat strip or a spring? perhaps this item is wore? i am jsut guessing here but i would test teh real water temp and adjust the aquastat accordingly. and keep an eye on it, perhaps it is getting close to failing completely??
maybe the experts on these things will pop in and explain it to both of us
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home made OWB (2012)
Ontario Canada

Scott7m

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Re: Aquastat
« Reply #4 on: November 04, 2013, 06:25:53 PM »
Is it a honeywell?
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jerkash

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Re: Aquastat
« Reply #5 on: November 04, 2013, 06:35:44 PM »
Emerson
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victor6deep

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Re: Aquastat
« Reply #6 on: November 04, 2013, 07:26:25 PM »
I set my aquastat at 170 off and when the fan shuts off my temp gauge reads 165. I think willie is right with maybe you have some lime scale on the probe in the water jacket affecting sensitivity.
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slimjim

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Re: Aquastat
« Reply #7 on: November 05, 2013, 04:49:35 AM »
It could be scale or all bimetal aquastats that I have ever dealt with are not the most accurate way to go, that honeywell that I keep talking about is not the most accurate but it does the job for a long time without problems and is inexpensive
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