Go Back   Thor Forums > Thor Tech Forums > Maintenance and Repair
Click Here to Login
Reply
 
Thread Tools Display Modes
 
Old 02-27-2020, 04:01 PM   #1
Junior Member
 
Brand: Thor Motor Coach
State: California
Posts: 5
THOR #17902
Furnace very loud

I have a 2020 Thor 27R with a Dometic DF series furnace. When I first turn on the heater, the blowers start and run for a few seconds, then it appears the LP kicks and makes a very loud roaring noise until the coach reaches temperature. Then the roaring stops, the blowers run for a few minutes then they shut off. The noise is actually louder on the outside of the coach and disturbs my fellow campers.

Can anybody tell me the cause and any solutions to this problem. I would really appreciate it.

Thanks in advance.
__________________

__________________
wsthomas1 is offline   Reply With Quote
Old 02-27-2020, 04:25 PM   #2
Senior Member
 
ducksface's Avatar
 
Brand: Thor Motor Coach
Model: 2018 24.1 AXISSIXxSIX
State: Arizona
Posts: 1,419
THOR #13932
It's just the flame in a venturi being a flame.
Have you listened to your disturbed camping neighbors furnaces as a comparison?


Some well placed rock wool or sound guard of some sort will help you a bit with the inside noise but not the outside.

(a propane fridge makes a similar but quieter noise)
(so does a tankless water heater, about as loud as the coach heater)
(so does any modern home furnace powered by any gas)

I'm going to guess that all 62.000 btu furnaces make very close to the same outside noise as any other 62,000(insert your number here) propane heater.
__________________

__________________
Below is a link to most of my modifications either accomplished or pending.
https://www.thorforums.com/forums/f2...n-18996-3.html

Click on my pictures then click the pop-up for a full screen zoomable picture.
ducksface is offline   Reply With Quote
Old 02-27-2020, 04:38 PM   #3
Senior Member
 
Long & Winding road's Avatar
 
Brand: Thor Motor Coach
Model: 2017 Axis 25.4
State: Arkansas
Posts: 2,394
THOR #12231
I worked on this a couple of years ago. I insulated the cold air return and it helped some overall (on the inside) but its just as loud on the outside. I did a write up on this if you want to do a search (I will see if I can find it and post it hear later).

I also stuffed insluation under every cabenet / drawers to absorb sound (perhap keeps a little more heat in or out of the RV depending on the season?)

IMO all of these furnuces are loud so most likey yours in operating fine. It wakes me up at night so I will heat up the RV some before I go to bed then turn it down to like 60 at night so it minimizes the amount it come one. I also will use a ceramic heater if its really cold when im plugged into shore power. But I dont do much winter camping so its not an issue for me.

Try insulating the cold air return and see how you like it. Let us know how it turns out.
__________________
2017 Axis / 25.4: Big Foot Levelers, Aims 1200 Watt inverter, Ceramic Window Tint, Full River AGM 6V batteries, Front Hellwig Sway bar / Rear Track Arm, Safe T Plus Steering Stabilizer, PD 4655 converter, Hard Wired Surge Guard, WEboost + WiFi Ranger, LED Headlights/Driving lights, Fresh water surge tank, Black Tank Tornado flush, 4999 zip ties.
Long & Winding road is offline   Reply With Quote
Old 02-27-2020, 05:00 PM   #4
Senior Member
 
Long & Winding road's Avatar
 
Brand: Thor Motor Coach
Model: 2017 Axis 25.4
State: Arkansas
Posts: 2,394
THOR #12231
Found my old writeup. "How I insulated my heater last winter". I hope this helps.

https://www.thorforums.com/forums/f2...ter-14324.html
__________________
2017 Axis / 25.4: Big Foot Levelers, Aims 1200 Watt inverter, Ceramic Window Tint, Full River AGM 6V batteries, Front Hellwig Sway bar / Rear Track Arm, Safe T Plus Steering Stabilizer, PD 4655 converter, Hard Wired Surge Guard, WEboost + WiFi Ranger, LED Headlights/Driving lights, Fresh water surge tank, Black Tank Tornado flush, 4999 zip ties.
Long & Winding road is offline   Reply With Quote
Old 02-27-2020, 05:09 PM   #5
Senior Member
 
ducksface's Avatar
 
Brand: Thor Motor Coach
Model: 2018 24.1 AXISSIXxSIX
State: Arizona
Posts: 1,419
THOR #13932
https://www.amazon.com/dp/B01CTM0H1S...v_ov_lig_dp_it

Easy to build, easy to buy.
The noise doesn't bother us so I haven't done this yet.
When I put in the thermostatically controlled duct to the basement, I'll put these in while it's all torn apart.

(I think a 2 liter soda bottle stuffed/lined with scotchbrite would work really well.)
(so would a plastic shoe box from Walmart with some cardboard baffles duct taped inside)
__________________
Below is a link to most of my modifications either accomplished or pending.
https://www.thorforums.com/forums/f2...n-18996-3.html

Click on my pictures then click the pop-up for a full screen zoomable picture.
ducksface is offline   Reply With Quote
Old 02-27-2020, 06:32 PM   #6
Senior Member
 
Long & Winding road's Avatar
 
Brand: Thor Motor Coach
Model: 2017 Axis 25.4
State: Arkansas
Posts: 2,394
THOR #12231
Ok, I just looked at this link. Was that for the "cold air return" or the "forced heated air" (or both)?

Very intresting (but expesive). But you might need 2 or 3 of the 8 inch size for the Cold Air return so your not restrictive.

I like your idea of the home made baffle.

But if the noise really bothers you it might be worth it to some.

Thanks for the info.... I never seen that baffle before.
__________________
2017 Axis / 25.4: Big Foot Levelers, Aims 1200 Watt inverter, Ceramic Window Tint, Full River AGM 6V batteries, Front Hellwig Sway bar / Rear Track Arm, Safe T Plus Steering Stabilizer, PD 4655 converter, Hard Wired Surge Guard, WEboost + WiFi Ranger, LED Headlights/Driving lights, Fresh water surge tank, Black Tank Tornado flush, 4999 zip ties.
Long & Winding road is offline   Reply With Quote
Old 02-27-2020, 06:40 PM   #7
I Think We're Lost!
 
Bob Denman's Avatar
 
Brand: Still Looking
Model: Tiffin Wayfarer 24 BW
State: New York
Posts: 12,802
THOR #8860
I know that the furnace in our Outlaw would drown out the sound of me snoring...
The Missus kind of liked that.
__________________
Good Sam Member 843599689
FMCA Member F473304
Current coach: Tiffin Wayfarer 24 BW
"History shows again and again; how Nature points
out the folly of man..."
Bob Denman is offline   Reply With Quote
Old 02-27-2020, 06:45 PM   #8
Senior Member
 
ducksface's Avatar
 
Brand: Thor Motor Coach
Model: 2018 24.1 AXISSIXxSIX
State: Arizona
Posts: 1,419
THOR #13932
I wonder if a laminar jet would work for air?
Not the jet itself but a 2 liter bottle stuffed with drinking straws?
Would the laminar effect affect the white noise sound of the Unchecked duct?
__________________
Below is a link to most of my modifications either accomplished or pending.
https://www.thorforums.com/forums/f2...n-18996-3.html

Click on my pictures then click the pop-up for a full screen zoomable picture.
ducksface is offline   Reply With Quote
Old 02-27-2020, 07:04 PM   #9
Site Team
 
16ACE27's Avatar
 
Brand: Thor Motor Coach
Model: ACE 27.1
State: Florida
Posts: 3,774
THOR #7035
Quote:
Originally Posted by wsthomas1 View Post
I have a 2020 Thor 27R with a Dometic DF series furnace. When I first turn on the heater, the blowers start and run for a few seconds, then it appears the LP kicks and makes a very loud roaring noise until the coach reaches temperature. Then the roaring stops, the blowers run for a few minutes then they shut off. The noise is actually louder on the outside of the coach and disturbs my fellow campers.

Can anybody tell me the cause and any solutions to this problem. I would really appreciate it.

Thanks in advance.
How's your water heater sound? Should be similar to the furnace. If either is unusually loud the air/gas mix may need to be adjusted slightly. The manual tells you how to do that.
__________________
Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad
16ACE27 is offline   Reply With Quote
Old 02-27-2020, 07:05 PM   #10
Senior Member
 
Brand: Thor Motor Coach
Model: SOB 2014 Meridian 36M
State: Washington
Posts: 962
THOR #7205
WHAAAAAT???? I can't hear you... the furnace is TOO LOUD!!
__________________
Pat & Becky & now Katie
Wenatchee, WA
99dart is offline   Reply With Quote
Old 02-28-2020, 07:12 PM   #11
Junior Member
 
Brand: Thor Motor Coach
State: California
Posts: 5
THOR #17902
Thanks everyone for the info and ideas. The sound inside isn't that bad, it's the outside exhaust that's really loud. i like the idea of building that baffle, but the exhaust is pretty hot, so it would have to withstand some heat.

Does anybody know if there is an adjustment that can be made to reduce the gas flow without affecting the function of the heater too much?
__________________
wsthomas1 is offline   Reply With Quote
Old 02-28-2020, 07:56 PM   #12
Senior Member
 
jeffpiercemagic's Avatar
 
Brand: Thor Motor Coach
Model: Quantum RW28
State: Florida
Posts: 144
THOR #15031
Quote:
Originally Posted by wsthomas1 View Post
I have a 2020 Thor 27R with a Dometic DF series furnace. When I first turn on the heater, the blowers start and run for a few seconds, then it appears the LP kicks and makes a very loud roaring noise until the coach reaches temperature. Then the roaring stops, the blowers run for a few minutes then they shut off. The noise is actually louder on the outside of the coach and disturbs my fellow campers.

Can anybody tell me the cause and any solutions to this problem. I would really appreciate it.

Thanks in advance.
Mine sounds like a literal jet engine starting up, LOL!

Jeff
__________________
jeffpiercemagic is offline   Reply With Quote
Old 03-04-2020, 10:10 PM   #13
Member
 
Badmanrick's Avatar
 
Brand: Thor Motor Coach
Model: Hurricane 34J
State: Florida
Posts: 78
THOR #15745
All furnaces are LOUD. At least you know it is working properly.
__________________
BadmanRick
Good Sam Life Member
Good Sam Elite Member
FMCA Member
Badmanrick is offline   Reply With Quote
Old 03-05-2020, 12:42 AM   #14
Junior Member
 
Brand: Thor Motor Coach
State: Florida
Posts: 17
THOR #12281
Loud Furnace

Quote:
Originally Posted by wsthomas1 View Post
I have a 2020 Thor 27R with a Dometic DF series furnace. When I first turn on the heater, the blowers start and run for a few seconds, then it appears the LP kicks and makes a very loud roaring noise until the coach reaches temperature. Then the roaring stops, the blowers run for a few minutes then they shut off. The noise is actually louder on the outside of the coach and disturbs my fellow campers.

Can anybody tell me the cause and any solutions to this problem. I would really appreciate it.

Thanks in advance.
I too have noticed that the furnace in my Jayco Precept (now a Thor product) is loud when the burner turns on. I checked it out and everything looked OK so I guess it's the nature of the beast. It operates and heats fine otherwise.
__________________
hikerjohn7 is offline   Reply With Quote
Old 03-05-2020, 02:26 AM   #15
MLP
Member
 
Brand: Thor Motor Coach
State: California
Posts: 47
THOR #17478
If you are bothered by the noise and going to keep your rig for many years, then you may want to look into cheep heat. 30 or 50 amp electrical heating elements added to your furnace. It is in addition to the propane. That way when you have a power post, you can use the electric and be quiet and save on propane. Just one answer to the noise. I am not promoting it and do not have it or want it. The noise does not bother me, but maybe a solution to some that are.
__________________
MLP is offline   Reply With Quote
Old 03-05-2020, 01:46 PM   #16
Junior Member
 
Brand: Thor Motor Coach
State: Florida
Posts: 17
THOR #12281
Noise Doesn't Bother

Quote:
Originally Posted by MLP View Post
If you are bothered by the noise and going to keep your rig for many years, then you may want to look into cheep heat. 30 or 50 amp electrical heating elements added to your furnace. It is in addition to the propane. That way when you have a power post, you can use the electric and be quiet and save on propane. Just one answer to the noise. I am not promoting it and do not have it or want it. The noise does not bother me, but maybe a solution to some that are.
Once I determined there probably was nothing wrong with the unit, the noise didn't bother me anymore. In fact, the white noise may be why I sleep so well in the RV. I have not yet had neighbors complain. Perhaps theirs does the same. But the electric heat suggestion is good for not-to-cold weather. I take a space heater when I plan to have some cold nights and it really does knock the edge off so that our comforter suffices to keep us warm.
__________________
hikerjohn7 is offline   Reply With Quote
Old 03-05-2020, 03:56 PM   #17
MLP
Member
 
Brand: Thor Motor Coach
State: California
Posts: 47
THOR #17478
Quote:
Originally Posted by hikerjohn7 View Post
Once I determined there probably was nothing wrong with the unit, the noise didn't bother me anymore. In fact, the white noise may be why I sleep so well in the RV. I have not yet had neighbors complain. Perhaps theirs does the same. But the electric heat suggestion is good for not-to-cold weather. I take a space heater when I plan to have some cold nights and it really does knock the edge off so that our comforter suffices to keep us warm.

Be careful with the space heater. Another couple died in Florida at night do to a fire caused by a space heater. Several a year happen, but we too use one.
__________________
MLP is offline   Reply With Quote
Old 03-05-2020, 05:59 PM   #18
Junior Member
 
Brand: Thor Motor Coach
State: Florida
Posts: 17
THOR #12281
Safety With Space Heaters

Quote:
Originally Posted by MLP View Post
Be careful with the space heater. Another couple died in Florida at night do to a fire caused by a space heater. Several a year happen, but we too use one.
Yes, I know there is a risk so I have made sure I picked a circuit that is not overloaded. I chose a high quality, safely designed heater and I do not run it on a high setting.
__________________

__________________
hikerjohn7 is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


» Featured Campgrounds

Reviews provided by

Disclaimer:

This website is not affiliated with or endorsed by Thor Industries or any of its affiliates. This is an independent, unofficial site.




All times are GMT. The time now is 09:41 AM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0 PL2
×