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Old 06-03-2012, 08:01 PM   #1
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1985 25' Sovereign
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New Thermostat

Hi,
Need to purchase a new thermostat. Have a 1985 sovereign with a suburban
thermostat. Do you need to purchase a special thermostat for a trailer or
can you purchase one from a hardware store? Any advice is appreciated. Thank you. Judy
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Old 06-03-2012, 08:06 PM   #2
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I purchased my replacement from Lowes. Just make sure the one you get is rated for 12 volts dc or more. I like the digital that that I have, which is powered with AAA batteries.
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Old 06-03-2012, 09:49 PM   #3
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It should be a mechanical type rather than mercury type because of the varied positions off level the trailer will see. Many thermostats have built in anticipators that may be a real problem to deal with. I would stick to a mechanical type made for RV use
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Old 06-03-2012, 09:54 PM   #4
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Question

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Originally Posted by HowieE View Post
It should be a mechanical type rather than mercury type because of the varied positions off level the trailer will see. Many thermostats have built in anticipators that may be a real problem to deal with. I would stick to a mechanical type made for RV use
?

Do they still sell mercury switches in things like thermostats? I don't have any idea if they do or not, but with all the controversy around mercury, I would have thought that it would have been pulled off the market for home devices (such as a thermostat) a long time ago.
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Old 06-03-2012, 11:26 PM   #5
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Quote:
Originally Posted by jstokes View Post
Hi,
Need to purchase a new thermostat. Have a 1985 sovereign with a suburban
thermostat. Do you need to purchase a special thermostat for a trailer or
can you purchase one from a hardware store? Any advice is appreciated. Thank you. Judy
I would suggest getting one from Vintage Trailer Supply. The ones they sell have an "off" position and are completely mechanical. They don't require batteries, work on 12v, and don't require the trailer to be level.

Thermostats containing mercury are no longer being manufactured but there is some old stock still being sold. They work extremely well for stationary applications but not in Airstreams, because they are sensitive to tilt.

The battery operated digital thermostats sold at home centers will work but they do require batteries the replacement of which is then one more thing for the annual maintenance list.
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Old 06-03-2012, 11:59 PM   #6
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I like the battery operated digital ones. They will work with virtually all RV furnaces, using the R1 and W terminals. They must be the battery operated kind, not the digital ones which use 24 V AC power from a home furnace. Battery replacement is 1 to 2 years.
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Old 06-04-2012, 12:16 AM   #7
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Mercury switches are still being used in not only mechanicl thermostats but in floats in pump systems as well. This will not work well in an AS for the above mentioned reasons.
Digital thermostats can be mounted out of level (but will look like hell) and still function properly. Most home thermostats are wired for 12volt and usually use the same transformer the doorbell. Some are battery operated as well.
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