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11-09-2014, 08:50 PM
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#1
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Member
Join Date: Oct 2014
Posts: 44
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Manual switch for furnace fan?
Would it be easy enough to add a manual switch to run the furnace fan and not the actual heat of the furnace? I hate using my LP when I don't have to, so, I'd like to run my furnace fan and the electric fireplace to circulate warm air throughout. Any thoughts?
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11-09-2014, 09:40 PM
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#2
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Senior Member
Gulf Streamers Club
Join Date: Jan 2012
Location: Cincinnati
Posts: 19,925
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The furnace fan is a motor with two 'cage' fans on either end of the motor shaft. One pulls the air in from inside the RV, through the heat exchanger and back into the RV through the vents. The second fan is for combustion and helps push the exhaust gases out. It will run all the time too. Without the LP flame, I think you'll lose a lot of heat in the cold heat exchanger. It might be much easier to just put a small fan on the floor and blow heat from the fireplace to the colder parts of the RV. I don't think the fireplace is going to be capable of heating the whole RV, it's BTU output is much less than the furnace's capacity. Also, often the furnace has a duct outlet in the wet bay area to keep tanks and plumbing from freezing. Without the furnace, you'd need to put an incandescent light or two in there to keep it above 32º if you're in cold regions.
If your rooftop A/C is ducted, you could perhaps run one of them to circulate air, but again you're going to lose heat in the movement of the air.
__________________
Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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11-10-2014, 06:14 AM
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#3
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Senior Member
Join Date: Feb 2011
Location: Snowbird - Waterford Mi and Citrus Springs Fl.
Posts: 3,609
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To answer your question, sure. Not too hard at all, several different ways to do it. It's just a 12v motor. That said, I agree with Bob's thoughts above.
__________________
1997 37' HR Endeavor, 275hp Cat, Freightliner
03 CR-V Blue Ox, Ready Brake
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11-10-2014, 06:21 AM
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#4
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Senior Member
Jayco Owners Club
Join Date: Dec 2009
Location: Troutdale, Oregon
Posts: 1,110
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11-10-2014, 06:45 AM
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#5
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Member
Join Date: Oct 2014
Posts: 44
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Thanks, I appreciate the input!
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11-10-2014, 07:14 AM
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#6
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Registered User
Join Date: Mar 2010
Posts: 8,777
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Quote:
Originally Posted by shane772
Would it be easy enough to add a manual switch to run the furnace fan and not the actual heat of the furnace? I hate using my LP when I don't have to, so, I'd like to run my furnace fan and the electric fireplace to circulate warm air throughout. Any thoughts?
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shane772
When on shore power I sometimes run one of my roof airs on "fan only" to circulate the warm air generated by an electric space heater, or 2.
When boondocing I use a 4" 12V muffin fan to move the warmth generated by my Buddy heater.
Never considerd using my LP furnace fan to circulate heat because it uses considerably more 12V amps than a muffin fan.
Mel
'96 Safari
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11-10-2014, 10:19 AM
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#7
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Member
Join Date: Oct 2014
Posts: 44
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I was hoping if this could be done; it would circulate the warm air through the wet bay area too. We are camping over the week of thanksgiving and it's supposed to be COLD. The fireplace keeps the coach warm enough for our liking, just not sure about the pipes and tanks w/o the furnace running. I thought this would be a good remedy but I don't think it is now. The 'cheap heat' shown in the video above is cool but, I can buy a lot of propane for the price tag plus installation.
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11-10-2014, 10:36 AM
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#8
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Registered User
Join Date: Mar 2010
Posts: 8,777
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Quote:
Originally Posted by shane772
I was hoping if this could be done; it would circulate the warm air through the wet bay area too. We are camping over the week of thanksgiving and it's supposed to be COLD. The fireplace keeps the coach warm enough for our liking, just not sure about the pipes and tanks w/o the furnace running. I thought this would be a good remedy but I don't think it is now. The 'cheap heat' shown in the video above is cool but, I can buy a lot of propane for the price tag plus installation.
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shane772
X2 on the so called "Cheap Heat", (which IMO is NOT "cheap").
If I have shore power in COLD weather I use 1 or 2 electric space heaters in the coach..... AND one in the basement controlled by one of these:
Thermo Cube TC-3 - On at 35 Degrees, Off at 45 Degrees
Mel
'96 Safari
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11-10-2014, 11:29 AM
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#9
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"Formerly Diplomat Don"
Newmar Owners Club
Join Date: Apr 2005
Location: Moorpark, Ca.
Posts: 24,082
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shane772.....as long as you have electric power, just throw a "trouble light" with a 100 watt bulb into the wet bay to keep things warm enough.
__________________
Don & Mary
2019 Newmar Dutch Star 4018 (Freightliner)
2019 Ford Raptor
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11-10-2014, 11:39 AM
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#10
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Senior Member
Join Date: Mar 2013
Location: Boise, Idaho
Posts: 715
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I added a Gas or Electric switch to use the space heater with the forced air gas blower. I made a simple removable metal cover for the outside vents. The new inline wall thermostat is optional. This was done on our last 5th wheeler.
__________________
2016 Thor Tuscany 34ST XTE, Freightliner XCR, ISB 360hp/800tq. Allison 3000, Koni FSD shocks, Roadmaster 1.75" front sway bar, Safe-T-Plus, DYI air bag flow control valves.
2015 Jeep Willy's Wheeler Wrangler Unlimited Toad, Ready-Brute-Elite tow system.
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11-11-2014, 02:17 PM
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#11
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Member
Join Date: Oct 2014
Posts: 44
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very interesting IdahoSRT10, this may accomplish exactly what I'm wanting
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11-11-2014, 02:53 PM
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#12
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Senior Member
Join Date: Feb 2013
Posts: 944
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Not sure of your setup, but on mine the down side of using furnace fan would be it is ducted in the basement so may cool off air in duct, if your trying to keep basement from freezing that's a good thing.
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