GlennWest Posted July 3, 2019 Report Share Posted July 3, 2019 (edited) As you know I doing away with my Dometic unit. Will my thermostat still work for furance when I remove it. It has a box with it that controls the previous 2 different ac units. Mine is the older tall one, not the long newer one. The newer ac was used and older one together, so a box to make this work was installed. Edited July 3, 2019 by GlennWest Quote 2003 Teton Grand Freedom towed with 2006 Freightliner Century 120 across the beautiful USA welding pipe.https://photos.app.goo.gl/O32ZjgzSzgK7LAyt1 Link to comment Share on other sites More sharing options...
GlennWest Posted July 3, 2019 Author Report Share Posted July 3, 2019 Ok, looked at the wiring on line. Furance wire goes to main ac control box. So seems I have to replace with surburan furance thermostat. Quote 2003 Teton Grand Freedom towed with 2006 Freightliner Century 120 across the beautiful USA welding pipe.https://photos.app.goo.gl/O32ZjgzSzgK7LAyt1 Link to comment Share on other sites More sharing options...
Sehc Posted July 3, 2019 Report Share Posted July 3, 2019 My suburban thermostat is just a on off switch (thermal spring) to the furnace. Quote Link to comment Share on other sites More sharing options...
Kirk W Posted July 3, 2019 Report Share Posted July 3, 2019 56 minutes ago, Sehc said: My suburban thermostat is just a on off switch (thermal spring) to the furnace. That is all that is needed for the furnace but you will need to route a two conductorlead from the furnace to the location of the new(replacement) thermostat. There are 2 blue wires in the furnace that should connect to the thermostat and when calling for heat they are shorted together. At present that lead is run to the air conditioner. Probably be easiest to run a new one. Telephone type wire is ample for this purpose. Quote Good travelin !...............KirkFull-time 11+ years...... Now seasonal travelers.Kirk & Pam's Great RV Adventure Link to comment Share on other sites More sharing options...
GlennWest Posted July 3, 2019 Author Report Share Posted July 3, 2019 (edited) Thanks. Got to looking and the thermostate wire is in a crawl space and I have access too. Be easy to do. Glad someting is. Edited July 3, 2019 by GlennWest Quote 2003 Teton Grand Freedom towed with 2006 Freightliner Century 120 across the beautiful USA welding pipe.https://photos.app.goo.gl/O32ZjgzSzgK7LAyt1 Link to comment Share on other sites More sharing options...
GlennWest Posted July 4, 2019 Author Report Share Posted July 4, 2019 Shouldn't any 2 wire thermostat work? See some mechanical and digital ones at Lowe's. Quote 2003 Teton Grand Freedom towed with 2006 Freightliner Century 120 across the beautiful USA welding pipe.https://photos.app.goo.gl/O32ZjgzSzgK7LAyt1 Link to comment Share on other sites More sharing options...
Bill Joyce Posted July 4, 2019 Report Share Posted July 4, 2019 42 minutes ago, GlennWest said: Shouldn't any 2 wire thermostat work? See some mechanical and digital ones at Lowe's. Make sure it is a 12 volt thermostat, since many are 24 volt. Quote 2004 40' Newmar Dutch Star DP towing an AWD 2020 Ford Escape Hybrid, Fulltimer July 2003 to October 2018, Parttimer now. Travels through much of 2013 - http://www.sacnoth.com - Bill, Diane and Evita (the cat) Link to comment Share on other sites More sharing options...
Darryl&Rita Posted July 4, 2019 Report Share Posted July 4, 2019 15 minutes ago, Bill Joyce said: Make sure it is a 12 volt thermostat, since many are 24 volt. Or powered by it's own on-board batteries. Opens up the field a lot. Quote I have been wrong before, I'll probably be wrong again. 2000 Kenworth T 2000 w/N-14 and 10 speed Gen1 Autoshift, deck built by Star Fabrication 2006 smart fourtwo cdi cabriolet 2007 32.5' Fleetwood QuantumPlease e-mail us here. Link to comment Share on other sites More sharing options...
Kirk W Posted July 4, 2019 Report Share Posted July 4, 2019 2 hours ago, GlennWest said: Shouldn't any 2 wire thermostat work? See some mechanical and digital ones at Lowe's. Yes they should. If you just use one of the simplest thermostats it won't be voltage sensitive as they are just a bimetalic spring that expands or contracts to open or close a set of contacts to connect the two blue wires from your Suburban furnace. You can get one made for Suburban from Amazon for $14. Quote Good travelin !...............KirkFull-time 11+ years...... Now seasonal travelers.Kirk & Pam's Great RV Adventure Link to comment Share on other sites More sharing options...
sundancer268 Posted July 4, 2019 Report Share Posted July 4, 2019 Problem with the Suburban Stat is the dead band between the starting of the furnace and the shutoff. We had over a 4 degree swing and it was just uncomfortable. I replaced it with a battery operated stat from Home Depot and that cured the wide temp swings. Quote U.S. Navy GSMC(SW) (RETIRED) 1993-11-01, 26 years service with 23 years of that active and 3 years reserve. Now retired after 20 years at local hospital in the maintenance department. 1995 Gulf Stream Scenic Cruiser 34' DP W/6Spd Allison. Road Master Sterling All terrain, Air Force One, towing new 2019 Jeep Cherokee Elite Link to comment Share on other sites More sharing options...
GlennWest Posted July 4, 2019 Author Report Share Posted July 4, 2019 All the 24 v units i have read reports on said they work on 12v also. Work as low as 8 volts. Quote 2003 Teton Grand Freedom towed with 2006 Freightliner Century 120 across the beautiful USA welding pipe.https://photos.app.goo.gl/O32ZjgzSzgK7LAyt1 Link to comment Share on other sites More sharing options...
Bill Joyce Posted July 5, 2019 Report Share Posted July 5, 2019 https://www.rvweb.net/best-rv-thermostats-reviewed/ might help. The good information is at the bottom. Quote 2004 40' Newmar Dutch Star DP towing an AWD 2020 Ford Escape Hybrid, Fulltimer July 2003 to October 2018, Parttimer now. Travels through much of 2013 - http://www.sacnoth.com - Bill, Diane and Evita (the cat) Link to comment Share on other sites More sharing options...
Sehc Posted July 5, 2019 Report Share Posted July 5, 2019 Some of the modern thermostat, even the simple on/off, need external power. They will not work with the Suburban. Quote Link to comment Share on other sites More sharing options...
Darryl&Rita Posted July 5, 2019 Report Share Posted July 5, 2019 23 hours ago, GlennWest said: All the 24 v units i have read reports on said they work on 12v also. Work as low as 8 volts. The problem with 24 volt thermostats is twofold. The 24 volt system is AC, while the RV is DC. The other problem is most RV systems don't have a ground reference wire at the thermostat location. The 2 wires are only a switched pair. Quote I have been wrong before, I'll probably be wrong again. 2000 Kenworth T 2000 w/N-14 and 10 speed Gen1 Autoshift, deck built by Star Fabrication 2006 smart fourtwo cdi cabriolet 2007 32.5' Fleetwood QuantumPlease e-mail us here. Link to comment Share on other sites More sharing options...
GlennWest Posted July 7, 2019 Author Report Share Posted July 7, 2019 On 7/5/2019 at 10:11 AM, Bill Joyce said: https://www.rvweb.net/best-rv-thermostats-reviewed/ might help. The good information is at the bottom. only problem most all mentioned there is same as mine. Works off the ac control box up top. Quote 2003 Teton Grand Freedom towed with 2006 Freightliner Century 120 across the beautiful USA welding pipe.https://photos.app.goo.gl/O32ZjgzSzgK7LAyt1 Link to comment Share on other sites More sharing options...
GlennWest Posted July 7, 2019 Author Report Share Posted July 7, 2019 (edited) If it can be powered by batteries, shouldn't it work. Looking at this one.https://www.amazon.com/gp/product/B000GGPMO2/ref=ask_ql_qh_dp_hza Edited July 7, 2019 by GlennWest Quote 2003 Teton Grand Freedom towed with 2006 Freightliner Century 120 across the beautiful USA welding pipe.https://photos.app.goo.gl/O32ZjgzSzgK7LAyt1 Link to comment Share on other sites More sharing options...
Carlos Posted July 8, 2019 Report Share Posted July 8, 2019 Nearly all RV systems are microvolt, not 12/24v, and cannot power a thermostat. This is what I put in our TT and love it. Super easy to install, works great, and no wild temp swings any more. https://smile.amazon.com/gp/product/B000ALEBZY/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 Quote Link to comment Share on other sites More sharing options...
Darryl&Rita Posted July 8, 2019 Report Share Posted July 8, 2019 18 minutes ago, Carlos said: Nearly all RV systems are microvolt, not 12/24v, and cannot power a thermostat. This is what I put in our TT and love it. Super easy to install, works great, and no wild temp swings any more. https://smile.amazon.com/gp/product/B000ALEBZY/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 Sorry, Charlie. The flame sense circuit is micro to millivolt, but the control side is 12 volt. Quote I have been wrong before, I'll probably be wrong again. 2000 Kenworth T 2000 w/N-14 and 10 speed Gen1 Autoshift, deck built by Star Fabrication 2006 smart fourtwo cdi cabriolet 2007 32.5' Fleetwood QuantumPlease e-mail us here. Link to comment Share on other sites More sharing options...
Carlos Posted July 8, 2019 Report Share Posted July 8, 2019 And yet you still use a millivolt system thermostat. The semantics notwithstanding, you don't have 12v available at the thermostat to power it on most RVs. Quote Link to comment Share on other sites More sharing options...
Darryl&Rita Posted July 8, 2019 Report Share Posted July 8, 2019 I could use a line voltage thermostat, if I chose to. When you refer to a millivolt thermostat, you're referring to a system that uses a thermopile for electricity, and uses no outside electric source. No modern RV furnace runs like that. Quote I have been wrong before, I'll probably be wrong again. 2000 Kenworth T 2000 w/N-14 and 10 speed Gen1 Autoshift, deck built by Star Fabrication 2006 smart fourtwo cdi cabriolet 2007 32.5' Fleetwood QuantumPlease e-mail us here. Link to comment Share on other sites More sharing options...
GlennWest Posted July 8, 2019 Author Report Share Posted July 8, 2019 But if it runs on batteries it should work. Quote 2003 Teton Grand Freedom towed with 2006 Freightliner Century 120 across the beautiful USA welding pipe.https://photos.app.goo.gl/O32ZjgzSzgK7LAyt1 Link to comment Share on other sites More sharing options...
Carlos Posted July 8, 2019 Report Share Posted July 8, 2019 Just now, GlennWest said: But if it runs on batteries it should work. That's the important point, regardless of semantics. The thermostat needs to run on batteries of its own, and provide a simple contact closure. The one I linked to meets both of those. Household thermostats MIGHT be able to run on batteries, and they provide a pair of closure terminals for "on" as well as several other connections. They will work if the person installing it knows which terminals to use for that. The Hunter 42999 only provides two terminals so you can't go wrong. Quote Link to comment Share on other sites More sharing options...
GlennWest Posted September 14, 2019 Author Report Share Posted September 14, 2019 update, installed a Honeywell #RTH111. Called Honeywell support and asked which terminals supplied a simple on and off. He stated R and W.. Verified this with my ohmeter. Continuity when temp set above room temp. Off when set at room temp. Bingo. Hooked it up and furance don't come on. No real worry now since it is 90+ outside. Now, last winter I had to clean out orfice. A piece of rust was in it. This may have happened again. Quote 2003 Teton Grand Freedom towed with 2006 Freightliner Century 120 across the beautiful USA welding pipe.https://photos.app.goo.gl/O32ZjgzSzgK7LAyt1 Link to comment Share on other sites More sharing options...
Ray,IN Posted September 15, 2019 Report Share Posted September 15, 2019 On 7/4/2019 at 12:53 PM, Kirk W said: Yes they should. If you just use one of the simplest thermostats it won't be voltage sensitive as they are just a bimetalic spring that expands or contracts to open or close a set of contacts to connect the two blue wires from your Suburban furnace. You can get one made for Suburban from Amazon for $14. That's what I bought and used when my 'stat for the Fantastic Fan quit working. Quote 2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG retired;Good Sam Life member,FMCA ." And so, my fellow Americans: ask not what your country can do for you--ask what you can do for your country. John F. Kennedy 20 Jan 1961 Link to comment Share on other sites More sharing options...
GlennWest Posted September 15, 2019 Author Report Share Posted September 15, 2019 I know those work but this should also. All it does is make a circuit. The spring loaded ones like that have several degrees seperation. Quote 2003 Teton Grand Freedom towed with 2006 Freightliner Century 120 across the beautiful USA welding pipe.https://photos.app.goo.gl/O32ZjgzSzgK7LAyt1 Link to comment Share on other sites More sharing options...
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