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Old 02-19-2019, 10:48 PM   #1
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Thermostat question...

Hey Everyone... Couldn't find anything to fit mine, so thought I'd ask...

I have a duo - therm 65900 furnace, and an Old White - Rodger thermostat... It's not good Doesn't register correct temp, and sometimes I have smack it to wake up (and that's outside of the issue of furnace only blowing cold air these daze)...

There is no air or fan connected to it... Just the heat. It's the old "slide the switch over" style, which I'm fine with vs upgrading to digital. Question is (bet you know what it is already )... Can I just switch it out for a regular, slide it over thermostat, ie Honeywell ct334? Without having to fanagle anything re wires???

I've been digging around the site, and internet, but keep pulling up posts only for mods re digital (usually for a Hunter), but I just want something simple and basic The one I'm looking at says it's 750mV (not sure what that means re electrical dunce ), and I've also seen reference to it being "low voltage"... How does this equate to working or not working???
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Old 02-20-2019, 12:00 AM   #2
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I have two Surburban furnaces, but think they are the same as the Dometic Duo-Therm units in that they use two wire 12 VDC thermostats. I replaced my old thermostats with LuxPro 2 wire heat only digital thermostats several years ago. Got them from Amazon for around $15 each. They hold the temperatures within two degrees, which is much better than the old units that ran four degrees too hot, then three degrees too cold and fluctuated all the time.
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Old 02-20-2019, 01:28 AM   #3
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The easiest solution is probably a digital Hunter or Honeywell thermostat that is powered by a pair of AA batteries. The issue with many other traditional residential style thermostat is that they expect to be powered by 24V AC power from a transformer, either that or the so called millivolt systems introduced in the 1980's which operate on less than 1 volt , not the 5, 8, or 12VDC found in RV climate control systems
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Old 02-20-2019, 04:54 AM   #4
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X2 for the Hunter thermostat. I bought one for around $25 and replaced our old sliding version. Much better temperature control, and a way to install a High - Low speed switch for the fan. PM me with your email address and I can send installation instructions.

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The easiest solution is probably a digital Hunter or Honeywell thermostat that is powered by a pair of AA batteries. The issue with many other traditional residential style thermostat is that they expect to be powered by 24V AC power from a transformer, either that or the so called millivolt systems introduced in the 1980's which operate on less than 1 volt , not the 5, 8, or 12VDC found in RV climate control systems
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Old 02-20-2019, 06:16 PM   #5
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Quote:
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I have two Surburban furnaces, but think they are the same as the Dometic Duo-Therm units in that they use two wire 12 VDC thermostats. I replaced my old thermostats with LuxPro 2 wire heat only digital thermostats several years ago. Got them from Amazon for around $15 each. They hold the temperatures within two degrees, which is much better than the old units that ran four degrees too hot, then three degrees too cold and fluctuated all the time.
Cool! Thanx
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Old 02-20-2019, 06:20 PM   #6
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X2 for the Hunter thermostat. I bought one for around $25 and replaced our old sliding version. Much better temperature control, and a way to install a High - Low speed switch for the fan. PM me with your email address and I can send installation instructions.
There's no fan set up... Does thus make a difference?
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Old 02-21-2019, 07:51 AM   #7
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I don't think so. My original thermostat controlled a one speed fan in the A/C or furnace. The two speed fan switch was a modification I made with instructions from someone who posted on a different forum about the Hunter thermostat.


Also, the Hunter thermostat is battery powered so this must be occasionally replaced.


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There's no fan set up... Does thus make a difference?
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Old 02-23-2019, 12:34 PM   #8
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When they are talking milivolts generally they are talking about a thermostat that is used on a heater that is switching a system that has a thermocouple or a pilot generator in the circuit it is ok to use this type of stat.Rather then use another analog thermostat that is several degrees out of wack I would go with the digital thermostat. It is as simple to use as the analog one you are currently using. What ever brand you select just be sure it isn’t a set back type and it must be powered by 2 aa battery’s not a 24 volt transformer the battery’s will last years.A heat only or heat cool will work ok it requires connecting only the 2 wires you now have. You can find them on e bay new for around $10 or double that in wall mart or Home Depot.
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Old 02-26-2019, 04:43 AM   #9
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I have installed the Honeywells in several 5th wheels for myself and others. I did the programmable one on our stationary 5th wheel. It is great for those cold mornings! $35.00 at Home Depot
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