Re-attaching Battery Spring On Hunter Thermostat - HVAC - Contractor Talk

Re-attaching Battery Spring On Hunter Thermostat

 
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Old 08-19-2018, 10:00 AM   #1
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Re-attaching Battery Spring On Hunter Thermostat


After our thermostat kept showing "low batt" in shutdown mode I cleaned the contact surface that appears to be copper, and that had a greenish corrosive build. Sandpapered and then vinegar. That worked and I was able to reset.

It takes (3) 1.5 v batteries and the top one, when working around the tight confines, sprung loose its spring. Nothing seems to have snapped - but how do you get that somewhat folded-end back into the center hole of its tiny nipple ? Looks to be fabbed prior to assembly.

Should it be soldered?

Would post a pic, but I don't want to risk taking the thing apart again as it was compressed "loose" back in contact and I felt lucky just to be able to close it up and reprogram.

Will do on the next batt change in the coming months - nobody wanted lithium!
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Old 08-19-2018, 10:58 AM   #2
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Re: Re-attaching Battery Spring On Hunter Thermostat


"If" I am understanding you, the metal tab/spring is effectively riveted onto a stud. Solder should work.



FWIW I have a small handheld sandblaster I bought for doing a flood recovery on a very special Porsche. With bead blasting media it works awesome for cleaning up metal contacts.

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Old 08-19-2018, 11:35 AM   #3
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Re: Re-attaching Battery Spring On Hunter Thermostat


I'd have to see it to recommend a method of reattachment.

But cautionary note for the future: Contacts like that are almost always electroplated. Sandpaper will shine them up, but they'll corrode again much more quickly with the plating removed.

Better to just burnish them with a piece of copper or brass. If you must use an abrasive, try a pencil eraser.
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Old 08-19-2018, 11:51 AM   #4
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Re: Re-attaching Battery Spring On Hunter Thermostat


Quote:
Originally Posted by Tinstaafl View Post
I'd have to see it to recommend a method of reattachment.

But cautionary note for the future: Contacts like that are almost always electroplated. Sandpaper will shine them up, but they'll corrode again much more quickly with the plating removed.

Better to just burnish them with a piece of copper or brass. If you must use an abrasive, try a pencil eraser.
It looks copper through and through... looks anyway
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Old 08-19-2018, 12:13 PM   #5
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Re: Re-attaching Battery Spring On Hunter Thermostat


Quote:
Originally Posted by Tinstaafl View Post
But cautionary note for the future: Contacts like that are almost always electroplated. Sandpaper will shine them up, but they'll corrode again much more quickly with the plating removed.
True, and I didn't mention it but a grease would be in order, which is what I did for the flood recovery vehicles electrical system.
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Old 08-19-2018, 01:20 PM   #6
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Re: Re-attaching Battery Spring On Hunter Thermostat


Throwing it in the trash and buying a new one is out of the question?

smh
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Old 08-19-2018, 04:23 PM   #7
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Re: Re-attaching Battery Spring On Hunter Thermostat


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Throwing it in the trash and buying a new one is out of the question?

smh
It's not my decision...or I would.

Has 15 yrs on it.

Last edited by artinall; 08-19-2018 at 04:27 PM.
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Old 08-19-2018, 09:54 PM   #8
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Re: Re-attaching Battery Spring On Hunter Thermostat


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It's not my decision...or I would.

Has 15 yrs on it.
It probably doesn't need the battery.
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Old 08-21-2018, 06:25 PM   #9
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Re: Re-attaching Battery Spring On Hunter Thermostat


Replacement NEW E-star rated thermostat would most likely get a rebate on your power bill(s)

I.E. the NEW one would pay you to be installed.....

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