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Old 08-30-2015, 12:14 PM   #1
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Question thermostat replacement

Hello friends. This forum is my go to for all Sunline related questions. Thank you for the years of advice.

Today I need to know about removing the plastic sleeve on the new thermostat bulb. DH did remove it when opening the box THEN when reading instructions there is a black box warning saying NOT to remove it!!! What the heck? And since the sleeve has a slice down the side of it--IF it is needed what should we do to replace it?

We are both fairly mechanically savvy and neither of us has ever seen a sleeved thermostat bulb and can't imagine why it would be needed. Then again we're just not sure and that is why I'm here!

Thanks again, Susan
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Old 08-30-2015, 05:09 PM   #2
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Thermostat for what? Heater,
AC ,refrigerator?
Could be protection for mercury vile if so equipped.
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Old 08-31-2015, 03:48 AM   #3
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Sorry , failed to say this is for the water heater. So far all I can find out sleuthing around online is that it is to prevent corrosion. Can't really see how that would work as the end of the plastic sleeve is just bent over not sealed.
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Old 09-01-2015, 12:05 PM   #4
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May have to do with contact of two different metals, i.e. aluminum and steel. That could cause corrosion.
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Old 09-01-2015, 03:43 PM   #5
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So do you think that when the thermostat is inserted into the tank it touches metal? I would think it is just surrounded by the water in the tank. Again, I don't know that is why I ask. I've never seen a cutaway view of a 6 gallon water heater so really haven't a clue.
We were told the part is not returnable so I guess we might just go ahead and install it and if and when it corrodes replace it.
Oh where oh where is John B?
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Old 09-01-2015, 04:20 PM   #6
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Pictures of the thermostat and the plastic might help. Kind of heater, brand and model number, and part number of the thermostat also. The Devil is in the details.




Edited to add: What I see online is that the clear plastic cover is to protect from corrosion. The bulb in the water will corrode, if not from plain water from the chemicals in the water. If water can't touch the metal ..... no corrosion.


Just from curiosity, did the old thermostat have a plastic sleeve?
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Old 09-03-2015, 03:29 AM   #7
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Thanks for the replies. Like I said earlier, the plastic sleeve was just bent over at the end not sealed so really water would seep in and around the bulb. The old bulb did not have a sleeve.
~This may turn out to be something similar to those anode(sacrificial) rods they put in water heater tanks nowdays: some plumbers will say to cut them off they are not needed others will say leave them to do their job and replace when corroded~

We have gone ahead and installed it. Only time will tell how fast it will corrode.
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Old 09-03-2015, 05:08 PM   #8
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Whatever happens you now have experience, and proper instructions, to do the repair next time.


Good Luck!
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